Revival of superconductivity in high magnetic fields and a possible p-wave pairing in (TMTSF)2PF6
Abstract
From the BCS theory, we derive an equation which accounts for quantum effects of an electron motion along open Fermi surfaces and determines the upper critical field H⊥c2(T) perpendicular to the chains of a quasi-one-dimensional conductor. This equation demonstrates two unusual phenomena: (1) restoration of superconductivity at H>H⊥c2(0) in p-wave superconductors, where H⊥c2(0) is the quasiclassical upper critical field; (2) surviving of superconductivity at H⊥c2(0), Hp<H<HLOFFp in s-wave superconductors, where Hp is the Clogston-Chandrasekhar paramagnetic limiting field; the critical field HLOFFp is introduced in the paper. An analysis of recent experimental data by I. J. Lee, M. J. Naughton, G. M. Danner, and P. M. Chaikin [Phys. Rev. Lett. 78, 3555 (1997)] shows that superconductivity significantly exceeds HLOFFp for b direction of a magnetic field in (TMTSF)2PF6. This demonstrates a strong suppression of the Pauli pair breaking effects and may reflect a p-wave pairing of electrons.
- Publication:
-
Physical Review B
- Pub Date:
- January 1999
- DOI:
- 10.1103/PhysRevB.59.R721
- Bibcode:
- 1999PhRvB..59..721L
- Keywords:
-
- 74.70.Kn;
- 74.60.Ec;
- Organic superconductors