Possible triplet order parameter in a Q1D organic superconductor (TMTSF)2PF6

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Abstract

We point out that (TMTSF)2PF6 compound at P ≃ 6 kbar is possibly a triplet superconductor with the vector order parameter d = (dx ≠ 0, dy ,dz = 0). It corresponds to an anisotropic spin susceptibility in a superconducting state: χb′(z) = χ0, χa(x) ≠ χ0, where χ0 is its value in a metallic phase. (Here, the spin quantization axis, z, is parallel to the easy axis, b′, of an antiferromagnetic SDW phase existing at P = 0). It is shown that the suggested order parameter can explain why the upper critical field along b′-axis (I.J. Lee, M.J. Naughton, G. Danner, and P.M. Chaikin, Phys. Rev. Lett. 78, 3555 (1997)) exceeds all paramagnetic limiting fields (including that for a non-uniform superconductivity) whereas the upper critical field along the a-axis is restricted by the Pauli paramagnetic effects. The triplet order parameter is consistent with the earlier results on a destruction of superconductivity by nonmagnetic impurities and the absence of the Hebel-Slichter peak in the NMR data as well as with the recent Knight shift measurements by S. Brown et al and by I. J. Lee et al.

Original languageEnglish (US)
Pages (from-to)1699-1700
Number of pages2
JournalPhysica C: Superconductivity and its Applications
Volume341-348
Issue numberPART 2
StatePublished - 2000
Externally publishedYes

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organic superconductors
Superconductivity
Superconducting materials
superconductivity
nuclear magnetic resonance
Nuclear magnetic resonance
Impurities
destruction
magnetic permeability
impurities

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Possible triplet order parameter in a Q1D organic superconductor (TMTSF)2PF6. / Lebed, Andrei G.

In: Physica C: Superconductivity and its Applications, Vol. 341-348, No. PART 2, 2000, p. 1699-1700.

Research output: Contribution to journalArticle

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