{"id":4151,"date":"2026-01-06T09:21:08","date_gmt":"2026-01-06T03:51:08","guid":{"rendered":"https:\/\/vajiramandravi.com\/upsc-exam\/?p=4151"},"modified":"2026-01-07T11:06:30","modified_gmt":"2026-01-07T05:36:30","slug":"superconductors","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/upsc-exam\/superconductors\/","title":{"rendered":"Superconductors, Definition, Types, Applications & Materials"},"content":{"rendered":"

Superconductors are materials that conduct electricity with\u00a0zero resistance\u00a0<\/strong>when cooled below a\u00a0characteristic temperature<\/strong>. Also, these materials expel magnetic fields when transitioning to the superconducting state. A normal conductor can become a superconductor when the electrons are paired to \u201ccooperate with a material\u2019s vibrating atom\u201d. The phenomenon of superconductivity was discovered in\u00a01911\u00a0<\/strong>by\u00a0Kamerlingh Onnes.<\/strong><\/p>\r\n

Superconductors find applications ranging from\u00a0MRI machines<\/strong>, and particle accelerators to magnetically levitated trains. Ongoing research focuses on raising the operating temperature and developing new high-temperature superconductor materials for various objectives.<\/p>\r\n

History of Superconductivity<\/h2>\r\n

One of the most intriguing quantum phenomena, superconductivity was first discovered in 1911. The major milestones in the scientific understanding of superconductors are as follows:<\/p>\r\n

    \r\n\t
  • 1911:<\/strong>\u00a0Superconductivity was first experimentally observed in mercury by Dutch physicist\u00a0Heike Kamerlingh Onnes<\/strong>. It vanished electrical resistance at\u00a04.2K temperature.<\/strong><\/li>\r\n\t
  • 1933<\/strong>: The\u00a0Meissner effec<\/strong>t explained the expulsion of magnetic fields from superconductors' interiors.<\/li>\r\n\t
  • 1957<\/strong>:\u00a0Bardeen, Cooper\u00a0<\/strong>and\u00a0Schrieffer<\/strong>\u00a0formulated the\u00a0BCS theory\u00a0<\/strong>successfully modelling superconductivity in conventional low-temperature superconductors through\u00a0electron-phonon interactions.<\/strong><\/li>\r\n\t
  • 1962<\/strong>:\u00a0Brian Josephson<\/strong>\u00a0predicted the tunnelling of electron pairs between superconductors separated by an insulating barrier. This Josephson effect enabled the design of\u00a0ultra-sensitive magnetometers.<\/strong><\/li>\r\n\t
  • 1986<\/strong>:\u00a0Georg Bednorz<\/strong>\u00a0and\u00a0Alex M\u00fcller<\/strong>\u00a0discovered\u00a0new ceramic oxide superconductors<\/strong>\u00a0with remarkably\u00a0high critical temperatures<\/strong>\u00a0exceeding liquid nitrogen temperatures.<\/li>\r\n\t
  • 1987<\/strong>:\u00a0Yttrium barium copper oxide (YBCO)\u00a0<\/strong>ceramic material was discovered with a superconducting transition temperature of 93K, which is above liquid nitrogen's 77K boiling point.<\/li>\r\n\t
  • 2008<\/strong>:\u00a0Iron-based high-temperature superconductors<\/strong>\u00a0were discovered further expanding the range of materials exhibiting this phenomenon.<\/li>\r\n<\/ul>\r\n

    Principle of Superconductivity<\/h2>\r\n

    Conventional superconductivity is explained by the formation of electron pairs known as\u00a0Cooper pairs<\/strong>\u00a0combined with\u00a0electron-phonon interactions<\/strong>\u00a0as conceptualised in the BCS theory:<\/p>\r\n

    \"Cooper<\/figure>\r\n
      \r\n\t
    • Cooper pairs:\u00a0<\/strong>At sufficiently low cryogenic temperatures, interactions between\u00a0conducting electrons\u00a0<\/strong>and\u00a0crystal lattice vibrations (phonons)<\/strong>\u00a0cause the lattice to distort slightly.\r\n\r\n
        \r\n\t
      • This causes some electrons near the\u00a0Fermi level\u00a0<\/strong>to become unstable and rearrange into pairs called\u00a0Cooper Pairs.<\/strong><\/li>\r\n\t
      • These Cooper electron pairs can move through the metallic crystal lattice without resistance as they do not get scattered by the lattice vibrations.<\/li>\r\n\t
      • Large-scale coherent movement of many such tightly bound Cooper pairs leads to exactly\u00a0zero DC electrical resistance<\/strong>\u00a0inside the material.<\/li>\r\n\t
      • The\u00a0Cooper pairs<\/strong>\u00a0also induce a weak superconductivity in the rest of the material lattice further reinforcing the effect through a feedback loop.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n
        \"meissner-effect.webp\"<\/figure>\r\n
          \r\n\t
        • Meissner effect:\u00a0<\/strong>The Meissner effect leads to the complete expulsion of external magnetic flux lines from a superconductor's interior when cooled below the transition temperature.\r\n\r\n
            \r\n\t
          • This distinguishes superconductors from other types of conductors.<\/li>\r\n<\/ul>\r\n<\/li>\r\n<\/ul>\r\n

            Superconducting Materials<\/h2>\r\n

            Different classes of materials exhibit superconductivity at different characteristic temperatures. Some that have achieved the highest known superconducting critical temperatures are:<\/p>\r\n

            \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
            Material<\/strong><\/td>\r\nCritical Temperature<\/strong><\/td>\r\nKey Facts<\/strong><\/td>\r\n<\/tr>\r\n
            Mercury<\/strong><\/td>\r\n4.2 K<\/td>\r\n- The\u00a0first superconductor<\/strong>\u00a0was discovered by Kamerlingh Onnes<\/td>\r\n<\/tr>\r\n
            Niobium-titanium alloys<\/strong><\/td>\r\n10 K<\/td>\r\n- Used in\u00a0MRI\u00a0<\/strong>machines, particle accelerators<\/td>\r\n<\/tr>\r\n
            Niobium-tin<\/strong><\/td>\r\n18 K<\/td>\r\n- Used in powerful electromagnets<\/td>\r\n<\/tr>\r\n
            Niobium-germanium<\/strong><\/td>\r\n23 K<\/td>\r\n- Used in\u00a0NMR\u00a0<\/strong>spectrometers<\/td>\r\n<\/tr>\r\n
            Ceramic cuprates<\/strong><\/td>\r\n90-130 K<\/td>\r\n- The\u00a0first high-temperature<\/strong>\u00a0superconductors discovered by Bednorz and M\u00fcller<\/td>\r\n<\/tr>\r\n
            Yttrium barium copper oxide (YBCO)<\/strong><\/td>\r\n92 K<\/td>\r\n- Allows high-temperature superconductivity, used in motors<\/td>\r\n<\/tr>\r\n
            Bismuth strontium calcium copper oxide (BSCCO)<\/strong><\/td>\r\n107 K<\/td>\r\n- High-temperature superconductor, used in wires and tapes<\/td>\r\n<\/tr>\r\n
            Mercury thallium barium calcium copper oxide<\/strong><\/td>\r\n133 K<\/td>\r\n- Highest critical temperature non-cuprate superconductor<\/td>\r\n<\/tr>\r\n
            Magnesium diboride<\/strong><\/td>\r\n39 K<\/td>\r\n- Inexpensive material made from magnesium and boron<\/td>\r\n<\/tr>\r\n
            Hydrogen sulfide<\/strong><\/td>\r\n203 K<\/td>\r\n- Predicted to superconduct at extremely high temperatures under pressure<\/td>\r\n<\/tr>\r\n
            Carbon nanotubes<\/strong><\/td>\r\n-240 K<\/td>\r\n- Superconduct only along their length, not across<\/td>\r\n<\/tr>\r\n
            Graphene<\/strong><\/td>\r\n1.7 K<\/td>\r\n- Becomes superconducting when coupled with calcium<\/td>\r\n<\/tr>\r\n
            Fullerenes<\/strong><\/td>\r\n33k<\/td>\r\n- Carbon-based spherical molecules like\u00a0C60\u00a0<\/strong>exhibit superconductivity at relatively high temperatures when intercalated with alkali metals.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n

            Types of Superconductors<\/h2>\r\n

            Superconductors can be broadly classified based on their\u00a0transition temperature\u00a0<\/strong>and\u00a0material properties\u00a0<\/strong>into low-temperature and high-temperature variants:<\/p>\r\n

              \r\n\t
            • Low-Temperature Superconductors (LTS): These include elemental superconducting metals like aluminium, lead, and mercury which exhibit superconductivity just a few degrees above absolute zero temperature.<\/strong><\/li>\r\n\t
            • These also include weak\/low-capacity superconducting alloys made using\u00a0niobium-titanium<\/strong>, and\u00a0niobium-tin\u00a0<\/strong>with transition temperatures well below 30 K.<\/li>\r\n\t
            • LTS is explained well by the\u00a0BCS theory<\/strong>\u00a0which models the\u00a0electron-phonon\u00a0<\/strong>interactions.<\/li>\r\n\t
            • High-temperature superconductors (HTS):\u00a0<\/strong>These are made using complex ceramic compounds such as YBCO, and BSCCO, which incredibly show superconducting transition at temperatures between 77-138 K.<\/li>\r\n\t
            • These\u00a0do not require electron-phonon interactions and Cooper pairing<\/strong>\u00a0and follow\u00a0unconventional mechanisms<\/strong>\u00a0arising from their\u00a0crystalline lattice structure.<\/strong><\/li>\r\n\t
            • They offer higher current carrying capacities and magnetic field tolerance compared to LTS. Also, they simplify cooling requirements drastically.<\/li>\r\n\t
            • Unconventional Superconductors:\u00a0<\/strong>These are also being researched - carbon-based organic compounds, metallic hydrogen etc. that become superconducting upon specific doping or under extreme pressures.<\/li>\r\n<\/ul>\r\n

              Applications of Superconductors<\/h2>\r\n

              Some major application areas and benefits of superconductors are:<\/p>\r\n

              \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
              Application Area<\/strong><\/td>\r\nBenefits<\/strong><\/td>\r\n<\/tr>\r\n
              Healthcare<\/strong><\/td>\r\n\r\n

              - MRI scanners<\/strong>\u00a0use superconducting magnets to generate strong magnetic fields required for magnetic resonance imaging in medical diagnostics.<\/p>\r\n

              - SQUIDs<\/strong>\u00a0(Superconducting Quantum Interference Devices) are very sensitive magnetometers used in\u00a0magnetoencephalography\u00a0<\/strong>to map brain activity.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

              Scientific Research<\/strong><\/td>\r\n\r\n

              - Particle accelerators like theLarge Hadron Collider use superconducting magnets to steer and focus particle beams due to their ability to create intense fields.<\/p>\r\n

              - High magnetic field experiments in physics rely on superconductors to generate the extremely strong magnetic fields required.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

              Power Engineering<\/strong><\/td>\r\n\r\n

              - Superconducting wires allow the\u00a0construction of motors, generators, transformers\u00a0<\/strong>and\u00a0transmission cables<\/strong>\u00a0with greater power densities and efficiencies.<\/p>\r\n

              - Superconducting fault current limiters utilise superconductor properties to limit damage from short circuits in power grids<\/p>\r\n

              Tokamaks.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

              Transportation<\/strong><\/td>\r\n\r\n

              - Maglev trains\u00a0<\/strong>use superconducting magnets to levitate train cars and propel them by magnetic forces without physical contact.<\/p>\r\n

              - Superconducting magnetic levitation and propulsion systems are being researched for futuristic\u00a0spacecraft<\/strong>\u00a0concepts.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

              Electronics and Quantum computing<\/strong><\/td>\r\n\r\n

              - Superconducting materials are used to build\u00a0ultra-fast, low-power quantum computers<\/strong>\u00a0and\u00a0sensitive detectors\u00a0<\/strong>and\u00a0amplifiers.<\/strong><\/p>\r\n

              - Superconducting antennas\u00a0<\/strong>offer low losses for high-frequency radio waves.<\/p>\r\n

                \r\n\t
              • IBM's Osprey<\/strong>\u00a0is the most advanced quantum computer, a\u00a0433-qubit processor\u00a0<\/strong>with a median coherence time of\u00a070-80 microseconds<\/strong>, triple the size of its predecessor,\u00a0The Eagle.<\/strong><\/li>\r\n<\/ul>\r\n<\/td>\r\n<\/tr>\r\n
              Energy Storage<\/strong><\/td>\r\n- Superconducting magnetic energy storage (SMES)<\/strong>\u00a0offers large-scale energy storage with rapid charge\/discharge, using magnetic fields in superconducting coils.<\/td>\r\n<\/tr>\r\n
              Industrial processing<\/strong><\/td>\r\n\r\n

              - Magnetic separation techniques utilise\u00a0superconducting magnets<\/strong>\u00a0to sort materials.<\/p>\r\n

              - Superconducting bearings allow frictionless, levitating rotation.<\/p>\r\n<\/td>\r\n<\/tr>\r\n

              Monitoring<\/strong><\/td>\r\n- SQUID magnetometers are\u00a0ultra-sensitive detectors<\/strong>\u00a0of magnetic fields used in science, medicine and geomagnetic surveys.<\/td>\r\n<\/tr>\r\n
              Defence<\/strong><\/td>\r\n\r\n

              - Degaussing systems<\/strong>\u00a0use superconducting coils to cancel ships' magnetic fields as protection against mines.<\/p>\r\n

              - Superconductive shields block\u00a0electromagnetic pulses\u00a0<\/strong>and\u00a0radiation.<\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n

              \"working-principle-of-the-superconducting.webp\"<\/figure>\r\n

              Challenges with Superconductors<\/h2>\r\n

              Some major technical and economic challenges exist in harnessing superconductors for practical applications:<\/p>\r\n

                \r\n\t
              • High operating temperatures:\u00a0<\/strong>Superconductors face challenges in achieving high critical temperatures, as conventional superconductors require extremely low temperatures.\r\n\r\n
                  \r\n\t
                • Researchers are developing high-temperature superconductors (HTS), like cuprate superconductors like\u00a0YBCO<\/strong>, which can operate at higher temperatures, such as\u00a0-181\u00b0C.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                • Fabrication and scalability:<\/strong>\u00a0Superconducting materials face challenges in fabrication and scalability due to complex manufacturing processes like.\r\n\r\n
                    \r\n\t
                  • Thin film deposition\u00a0<\/strong>and\u00a0wire fabrication<\/strong>, can be expensive and time-consuming, especially for high-quality wires using materials like\u00a0REBCO<\/strong>.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                  • Material defects and stability:\u00a0<\/strong>Superconductors are sensitive to defects, impurities, and structural instabilities, which can degrade their properties and reduce critical current density.\r\n\r\n
                      \r\n\t
                    • Researchers are exploring ways to mitigate these challenges through defect engineering and material stability improvement.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                    • Cost and commercialisation:<\/strong>\u00a0Superconductors, particularly high-temperature ones, can be costly to produce and commercialize due to\u00a0raw materials, fabrication techniques,\u00a0<\/strong>and\u00a0cryogenic cooling systems.<\/strong>\r\n
                        \r\n\t
                      • However, advancements in manufacturing processes and cost-effective production methods are being pursued to overcome this challenge.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                      • Integration and compatibility<\/strong>: Superconductors can be integrated into existing systems, requiring careful consideration of electrical insulation, thermal management, and mechanical stability to ensure compatibility with other materials and technologies.<\/li>\r\n<\/ul>\r\n

                        Superconductors in India<\/h2>\r\n

                        India has proactively furthered superconductivity research and developments with noteworthy indigenous contributions:<\/p>\r\n

                          \r\n\t
                        • National Superconductivity Mission:<\/strong>\u00a0It was launched in 2017 by the government to develop indigenous superconductors and their applications in various industries,\r\n\r\n
                            \r\n\t
                          • Focusing on\u00a0fundamental research, advanced materials, collaboration, technology transfer, and creating a skilled workforce.<\/strong><\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                          • Local manufacturing of MRI machines:\u00a0<\/strong>Indian scientists have successfully built the country's first MRI machine superconducting magnet domestically.\r\n\r\n
                              \r\n\t
                            • This aligns with national self-reliance goals in high-end medical equipment.<\/li>\r\n<\/ul>\r\n<\/li>\r\n\t
                            • Nuclear fusion progress:<\/strong>\u00a0Sub-systems for fusion reactors relying on superconductivity are being developed locally via initiatives like the\u00a0Steady State Superconducting Tokamak.<\/strong><\/li>\r\n\t
                            • High-temperature superconducting transformer<\/strong>: BHEL has indigenously developed India's first transformer using cutting-edge High-Temperature Superconductor technology through R&D efforts.<\/li>\r\n\t
                            • International collaborations:<\/strong>\u00a0Indian institutions are engaged with CERN for the\u00a0Particle Physics project PIP-II<\/strong>, focusing on designing novel superconducting and room-temperature magnets.<\/li>\r\n<\/ul>","protected":false},"excerpt":{"rendered":"

                              An overview of superconductors including their properties like zero resistance, critical temperature, Cooper pairs, conventional & unconventional types, and applications.<\/p>\n","protected":false},"author":6,"featured_media":4152,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[173],"tags":[40,203],"class_list":{"0":"post-4151","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-quest-level-3","8":"tag-quest","9":"tag-superconductors"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4151","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/comments?post=4151"}],"version-history":[{"count":1,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4151\/revisions"}],"predecessor-version":[{"id":20003,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/posts\/4151\/revisions\/20003"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media\/4152"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/media?parent=4151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/categories?post=4151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/upsc-exam\/wp-json\/wp\/v2\/tags?post=4151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}