Heavy fermion superconductor

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Heavy fermion superconductors are a type of unconventional superconductor.

The first heavy fermion superconductor, CeCu2Si2, was discovered by Frank Steglich in 1978. [1]

Since then over 30 heavy fermion superconductors were found (in materials based on Ce, U), with a critical temperature up to 2.3 K (in CeCoIn5). [2]

MaterialTC (K)commentsoriginal reference
CeCu2Si20.7first unconventional superconductor [1]
CeCoIn5 2.3highest TC of all Ce-based heavy fermions [2]
CePt3Si0.75first heavy-fermion superconductor with non-centrosymmetric crystal structure [3]
CeIn30.2superconducting only at high pressures [4]
UBe130.85p-wave superconductor [5]
UPt3 0.48several distinct superconducting phases [6]
URu2Si2 1.3mysterious 'hidden-order phase' below 17 K [7]
UPd2Al3 2.0antiferromagnetic below 14 K [8]
UNi2Al31.1antiferromagnetic below 5 K [9]

Heavy Fermion materials are intermetallic compounds, containing rare earth or actinide elements. The f-electrons of these atoms hybridize with the normal conduction electrons leading to quasiparticles with an enhanced effective mass.[ citation needed ]

From specific heat measurements (ΔC/C(TC) one knows that the Cooper pairs in the superconducting state are also formed by the heavy quasiparticles. [10] In contrast to normal superconductors it cannot be described by BCS-Theory. Due to the large effective mass, [11] the Fermi velocity is reduced and comparable to the inverse Debye frequency. This leads to the failing of the picture of electrons polarizing the lattice as an attractive force.[ citation needed ]

Some heavy fermion superconductors are candidate materials for the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. [12] In particular there has been evidence that CeCoIn5 close to the critical field is in an FFLO state. [13]

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CeCoIn5 ("Cerium-Cobalt-Indium 5") is a heavy-fermion superconductor with a layered crystal structure, with somewhat two-dimensional electronic transport properties. The critical temperature of 2.3 K is the highest among all of the Ce-based heavy-fermion superconductors.

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References

  1. 1 2 Steglich, F.; Aarts, J.; Bredl, C.D.; Lieke, W.; Meschede, D.; Franz, W.; Schäfer, H. (1979). "Superconductivity in the Presence of Strong Pauli Paramagnetism: CeCu2Si2". Physical Review Letters. 43 (25): 1892–1896. Bibcode:1979PhRvL..43.1892S. doi:10.1103/PhysRevLett.43.1892. hdl: 1887/81461 . S2CID   123497750.
  2. 1 2 Petrovic, C.; Pagliuso, P.G.; Hundley, M.F.; Movshovich, R.; Sarrao, J.L.; Thompson, J.D.; Fisk, Z.; Monthoux, P. (2001). "Heavy-fermion superconductivity in CeCoIn5 at 2.3 K". Journal of Physics: Condensed Matter. 13 (17): L337. arXiv: cond-mat/0103168 . Bibcode:2001JPCM...13L.337P. doi:10.1088/0953-8984/13/17/103. S2CID   59148857.
  3. ↑ E. Bauer; et al. (2004). "Heavy Fermion Superconductivity and Magnetic Order in Noncentrosymmetric CePt3Si". Phys. Rev. Lett. 92 (2): 027003. arXiv: cond-mat/0308083 . Bibcode:2004PhRvL..92b7003B. doi:10.1103/PhysRevLett.92.027003. PMID   14753961. S2CID   20007050.
  4. ↑ Mathur, N.D.; Grosche, F.M.; Julian, S.R.; Walker, I.R.; Freye, D.M.; Haselwimmer, R.K.W.; Lonzarich, G.G. (1998). "Magnetically mediated superconductivity in heavy fermion compounds". Nature. 394 (6688): 39. Bibcode:1998Natur.394...39M. doi:10.1038/27838. S2CID   52837444.
  5. ↑ Ott, H.R.; Rudigier, H.; Fisk, Z.; Smith, J.L. (1983). "UBe13: An Unconventional Actinide Superconductor". Phys. Rev. Lett. 50 (20): 1595. Bibcode:1983PhRvL..50.1595O. doi:10.1103/PhysRevLett.50.1595.
  6. ↑ Stewart, G.R.; Fisk, Z.; Willis, J.O.; Smith, J.L. (1984). "Possibility of Coexistence of Bulk Superconductivity and Spin Fluctuations in UPt3". Phys. Rev. Lett. 52 (8): 679. Bibcode:1984PhRvL..52..679S. doi:10.1103/PhysRevLett.52.679. S2CID   73591098.
  7. ↑ Palstra, T. T. M. and Menovsky, A. A. and Berg, J. van den and Dirkmaat, A. J. and Kes, P. H. and Nieuwenhuys, G. J. and Mydosh, J. A. (1985). "Superconducting and Magnetic Transitions in the Heavy-Fermion System URu2Si2". Phys. Rev. Lett. 55 (24): 2727–2730. Bibcode:1985PhRvL..55.2727P. doi:10.1103/PhysRevLett.55.2727. PMID   10032222.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  8. ↑ Geibel, C.; Schank, C.; Thies, S.; Kitazawa, H.; Bredl, C.D.; Böhm, A.; Rau, M.; Grauel, A.; Caspary, R.; Helfrich, R.; Ahlheim, U.; Weber, G.; Steglich, F. (1991). "Heavy-fermion superconductivity at Tc=2K in the antiferromagnet UPd2Al3". Z. Phys. B. 84 (1): 1. Bibcode:1991ZPhyB..84....1G. doi:10.1007/BF01453750. S2CID   121939561.
  9. ↑ Geibel, C.; Thies, S.; Kaczorowski, D.; Mehner, A.; Grauel, A.; Seidel, B.; Ahlheim, U.; Helfrich, R.; Petersen, K.; Bredl, C.D.; Steglich, F. (1991). "A new heavy-fermion superconductor: UNi2Al3". Z. Phys. B. 83 (3): 305. Bibcode:1991ZPhyB..83..305G. doi:10.1007/BF01313397. S2CID   121206896.
  10. ↑ Neil W. Ashcroft and N. David Mermin, Solid State Physics
  11. ↑ Pfleiderer, C. (2009). "Superconducting phases of f -electron compounds". Reviews of Modern Physics. 81 (4): 1551–1624. arXiv: 0905.2625 . Bibcode:2009RvMP...81.1551P. doi:10.1103/RevModPhys.81.1551. S2CID   119218693.
  12. ↑ Matsuda, Yuji; Shimahara, Hiroshi (2007). "Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors". J. Phys. Soc. Jpn. 76 (5): 051005. arXiv: cond-mat/0702481 . Bibcode:2007JPSJ...76e1005M. doi:10.1143/JPSJ.76.051005. S2CID   119429977.
  13. ↑ Bianchi, A.; Movshovich, R.; Capan, C.; Pagliuso, P.G.; Sarrao, J.L. (2003). "Possible Fulde-Ferrell-Larkin-Ovchinnikov State in CeCoIn5". Phys. Rev. Lett. 91 (18): 187004. arXiv: cond-mat/0304420 . Bibcode:2003PhRvL..91r7004B. doi:10.1103/PhysRevLett.91.187004. PMID   14611309. S2CID   25005211.
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