Novel superconducting phenomena in quasi-one-dimensional Bechgaard salts

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• 作者：Denis Jerome^a ; ^{denis.jerome@u-psud.fr" class="auth_mail" title="E-mail the corresponding author} ; Shingo Yonezawa^b
• 关键词：One-dimensional conductors ; Organic superconductivity ; Bechgaard salts ; (TMTSF)2ClO4
• 刊名：Comptes Rendus Physique
• 出版年：2016
• 出版时间：March-April 2016
• 年：2016
• 卷：17
• 期：3-4
• 页码：357-375
• 全文大小：2222 K

文摘

It is the saturation of the transition temperature T_c$T_{\mathrm{c}}$ in the range of 24 K for known materials in the late sixties that triggered the search for additional materials offering new coupling mechanisms leading in turn to higher T_c$T_{\mathrm{c}}$'s. As a result of this stimulation, superconductivity in organic matter was discovered in tetramethyl-tetraselenafulvalene-hexafluorophosphate, (TMTSF)₂PF₆${(\mathrm{TMTSF})}_2{\mathrm{PF}}_6$, in 1979, in the laboratory founded at Orsay by Professor Friedel and his colleagues in 1962. Although this conductor is a prototype example for low-dimensional physics, we mostly focus in this article on the superconducting phase of the ambient-pressure superconductor (TMTSF)₂ClO₄${(\mathrm{TMTSF})}_2{\mathrm{ClO}}_4$, which has been studied most intensively among the TMTSF salts. We shall present a series of experimental results supporting nodal d-wave symmetry for the superconducting gap in these prototypical quasi-one-dimensional conductors.