Magnetic Determination of Hc2 under Accurate Alignment in (TMTSF)2ClO4
Abstract
Cantilever magnetometry has been used to measure the upper critical magnetic field Hc2 of the quasi-one dimensional molecular organic superconductor (TMTSF)2ClO4. From simultaneous resistivity and torque magnetization experiments conducted under precise field alignment, Hc2 at low temperature is shown to reach 5T, nearly twice the Pauli paramagnetic limit imposed on spin singlet superconductors. These results constitute the first thermodynamic evidence for a large Hc2 in this system and provide support for spin triplet pairing in this unconventional superconductor
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