Paramagnetic-like destructive mechanism against superconductivity in Sr2RuO4: A triplet scenario versus a singlet one

Andrei G. Lebed, Nobuhiko Hayashi

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


The most popular description of superconductivity phenomenon in Sr2RuO4 is based on a so-called single-band (usually γ-band) "isotropic p-wave order parameter". In a magnetic field parallel to the conducting planes, such triplet "isotropic p-wave phase" is not destroyed by the Clogston-Chandrasekhar paramagnetic limiting field and can be destroyed only by the Meissner currents (i.e., the orbital effects). We analyze the orbital destructive effects against superconductivity for in-plane magnetic field (when electron orbits are open) and find that Hc2(0) ≃ 0.75 Tc(dHc2(T)/dT)Tc (which is a little bigger than the Werthamer-Helfand-Hohenberg value for an isotropic 3D case). We point out that the experimentally determined ratio Hc2(0)/Tc(dHc2 (T)/dT)Tc ≃ 0.44 - 0.5 in Sr2RuO4 is significantly less than the calculated value 0.75. Since the upper critical field, Kc2(T). is a well experimentally defined quantity in Sr2RuO4 (unlike high-Tc superconductors) we conclude that the single-band triplet "isotropic p-wave order parameter" seems to be inappropriate description of superconductivity in this material. Two possibilities are discussed: 1) Three-band nature of triplet superconductivity; 2) Singlet (d-wave) nature of superconducting pairing (in this case, the destructive actions of both the orbital effects and the Clogston-Chandrasekhar paramagnetic effects result in an agreement with the experimentally observed value of Hc2(0)/Tc(dHc2 (T)/dT)Tc).

Original languageEnglish (US)
Pages (from-to)1677-1678
Number of pages2
JournalPhysica C: Superconductivity and its applications
Issue numberPART 2
StatePublished - 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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