Exceeding the Pauli paramagnetic limit in the critical field of (TMTSF)2PF6

I. J. Lee; P. M. Chaikin; M. J. Naughton

doi:10.1103/PhysRevB.62.R14669

Exceeding the Pauli paramagnetic limit in the critical field of (TMTSF)₂PF₆

I. J. Lee, P. M. Chaikin, M. J. Naughton

Research output: Contribution to journal › Article › peer-review

Abstract

The resistive upper critical field along the b axis (H_c2∥b) in (TMTSF)₂PF₆ is investigated in detail in fields to 17.5 T and temperatures to T/T_c∼1/60, at various pressures near the border between spin-density wave and metallic states. Remarkably, in an optimum pressure setting reported here, it is found that the onset of superconductivity persists up to 9 T (>4H_p), which strongly suggests triplet Cooper pairing. Strong upward curvature with nearly diverging behavior of the critical field seems to suggest a field-dependent dimensional crossover, although the H_c2 enhancement is considerably more than that predicted by recent theories.

Original language	English (US)
Article number	R14669
Pages (from-to)	R14669-R14672
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	62
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.62.R14669
State	Published - Dec 1 2000

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.62.R14669

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abstract = "The resistive upper critical field along the b axis (Hc2∥b) in (TMTSF)2PF6 is investigated in detail in fields to 17.5 T and temperatures to T/Tc∼1/60, at various pressures near the border between spin-density wave and metallic states. Remarkably, in an optimum pressure setting reported here, it is found that the onset of superconductivity persists up to 9 T (>4Hp), which strongly suggests triplet Cooper pairing. Strong upward curvature with nearly diverging behavior of the critical field seems to suggest a field-dependent dimensional crossover, although the Hc2 enhancement is considerably more than that predicted by recent theories.",

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AB - The resistive upper critical field along the b axis (Hc2∥b) in (TMTSF)2PF6 is investigated in detail in fields to 17.5 T and temperatures to T/Tc∼1/60, at various pressures near the border between spin-density wave and metallic states. Remarkably, in an optimum pressure setting reported here, it is found that the onset of superconductivity persists up to 9 T (>4Hp), which strongly suggests triplet Cooper pairing. Strong upward curvature with nearly diverging behavior of the critical field seems to suggest a field-dependent dimensional crossover, although the Hc2 enhancement is considerably more than that predicted by recent theories.

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Exceeding the Pauli paramagnetic limit in the critical field of (TMTSF)₂PF₆

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