The anomalous superconducting phase diagram of (BEDO-TTF)₂ReO₄·H₂O

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• 作者：Agosta ; C.C. ; Ivanov ; S. ; Bayindir ; Z. ; Coffey ; T. ; Kushch ; N.D. ; Yagubskii ; E.B. ; Burgin ; T. ; et. al.
• 关键词：Transport measurements ; Superconducting phase transitions ; Organic superconductor
• 刊名：Synthetic Metals
• 出版年：1999
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：June, 1999
• 卷：103
• 期：1-3
• 页码：1795-1796
• 文件大小：196 K

摘要

We have measured the critical magnetic fields in the quasi 2D superconductor (BEDO-TTF)ReO₄·H₂O as a function of temperature with the magnetic field perpendicular and parallel to the conducting planes. A sharp positive change in the curvature, or kink, in the H-T phase line, similar to one in the phase diagram of the superconductor λ-(BETS)₂GaCl₄ occurs in the low temperature part of the phase diagram near T/T_C = 0.4. These kinks in the H-T phase line could be the signature of a change in the superconducting order parameter. We discuss other possibilities, such as magnetic transitions, and why they are less likely to exist in these salts. To support our claims we also present recent data showing part of the H-T phase diagram of λ-(BETS)₂GaCl₄ with the applied magnetic field parallel to the conducting planes.