Investigation of the quasi-one-dimensional superconducting state based on high-resolution field-angle-resolved calorimetory

分子导体（TMTSF）_2X是一种典型的准一维导体，其电导率在三个主要方向上都是不同的，已经被积极研究了30多年。在精确控制场方向的情况下，成功地测量了单晶（TMTSF）_2ClO_4的热容。根据所得结果，我们揭示了超导间隙结构和热力学相图。这些对于理解TMTSF家族的超导性是非常重要的信息，但近30年来一直没有得到实验的澄清。

The molecular conductor (TMTSF)_2X has been actively studied for more than 30 years as an archetypal quasi-one-dimensional conductor, in which conductivity differs for all three principle directions. We succeeded in measuring the heat capacity of single-crystalline (TMTSF)_2ClO_4 with accurately controlling the field direction. From the obtained results, we revealed the superconducting gap structure and the thermodynamic phase diagram. These are fundamentally important information for understandings of superconductivity of the TMTSF family but have not been experimentally clarified for this 30 years.