Upper critical field divergence induced by mesoscopic phase separation in the organic superconductor (TMTSF)2ReO4

Abstract

Due to the competition of two anion orders, (TMTSF)2ReO4, presents a phase coexistence between semiconducting and metallic (superconducting) regions (filaments or droplets) in a wide range of pressure. In this regime, the superconducting upper critical field for H parallel to both c* and b' axes present a linear part at low fields followed by a divergence above a cross-over field. This cross-over corresponds to the 3D-2D decoupling transition expected in filamentary or granular superconductors. The sharpness of the transition also demonstrates that all filaments are of similar sizes and self organize in a very ordered way. The distance between the filaments and their cross-section are estimated.

arXiv comment4 pages, 4 figures

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Cited by in corpus (2)

• Domain walls at the spin density wave endpoint of the organic superconductor (TMTSF)2PF6 under pressure
• Phase separation of superconducting phases in the Penson-Kolb-Hubbard model