Thermodynamic Evidence of d-Wave Superconductivity of the Organic Superconductor λ-( BETS)2GaCl4

被引：23

作者：

Imajo, Shusaku ^{[1
]}

Kanda, Naoki ^{[1
]}

Yamashita, Satoshi ^{[1
]}

Akutsu, Hiroki ^{[1
]}

Nakazawa, Yasuhiro ^{[1
]}

Kumagai, Hiroya ^{[2
]}

Kobayashi, Takuya ^{[2
]}

Kawamoto, Atsushi ^{[2
]}

机构：

[1] Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan

[2] Hokkaido Univ, Grad Sch Sci, Dept Condensed Matter Phys, Sapporo, Hokkaido 0600810, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2016年 / 85卷 / 04期

关键词：

HEAT-CAPACITY MEASUREMENTS; ORDER-PARAMETER; PHASE-DIAGRAM; CONDUCTOR; LAMBDA-(BETS)(2)GACL4; STATES; FIELD; GAP;

D O I：

10.7566/JPSJ.85.043705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Low-temperature heat capacity of the organic superconductor lambda-(BETS)(2)GaCl4 in a temperature range between 0.6 and 10K was measured for a single crystal sample by relaxation calorimetry technique. The contribution of electronic heat capacity in the superconducting state shows T-2 dependence at lower temperature that indicates the existence of quasi-particle excitations from the line-nodal gap structure of d-wave pairing. The recovery of the electronic heat capacity coefficient, gamma by magnetic field shows H-1/2 dependence that is consistent with the picture of line-nodal superconductor. In spite of the different packing from typical organic superconductors kappa-(BEDT-TTF)(2)X, the lambda-type BETS salt also shows a feature of d-wave symmetry pairing.

引用

页数：4

共 30 条

[1] Impurity-induced states in conventional and unconventional superconductors [J].

Balatsky, A. V. ;

Vekhter, I. ;

Zhu, Jian-Xin .

REVIEWS OF MODERN PHYSICS, 2006, 78 (02) :373-433

[2] Thermal conductivity of superconducting (TMTSF)(2)ClO4: Evidence for a nodeless gap [J].

Belin, S ;

Behnia, K .

PHYSICAL REVIEW LETTERS, 1997, 79 (11) :2125-2128

[3]

Clark K, 2010, NAT NANOTECHNOL, V5, P261, DOI [10.1038/nnano.2010.41, 10.1038/NNANO.2010.41]

[4] Superconducting phase diagram and FFLO signature in λ-(BETS)2GaCl4 from rf penetration depth measurements [J].

Coniglio, William A. ;

Winter, Laurel E. ;

Cho, Kyuil ;

Agosta, C. C. ;

Fravel, B. ;

Montgomery, L. K. .

PHYSICAL REVIEW B, 2011, 83 (22)

[5] Construction of relaxation calorimetry for 101-2 μg samples and heat capacity measurements of organic complexes [J].

Imajo, Shusaku ;

Fukuoka, Shuhei ;

Yamashita, Satoshi ;

Nakazawa, Yasuhiro .

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, 2016, 123 (03) :1871-1876

[6] Specific heat of organic superconductor λ-(BEDT-TSF)2GaCl4 [J].

Ishizaki, Y ;

Uozaki, H ;

Tsuchiya, H ;

Abe, Y ;

Negishi, E ;

Matsui, H ;

Endo, S ;

Toyota, N .

SYNTHETIC METALS, 2003, 133 :219-220

[7]

Jerome D., 1980, J PHYS LETT, V41, P95, DOI DOI 10.1051/JPHYSLET:0198000410409500

[8] NMR relaxation rate in the superconducting state of the organic conductor kappa-(BEDT-TTF)(2)Cu[N(CN)(2)]Br [J].

Kanoda, K ;

Miyagawa, K ;

Kawamoto, A ;

Nakazawa, Y .

PHYSICAL REVIEW B, 1996, 54 (01) :76-79

[9] Phase diagram of superconductivity on the anisotropic triangular lattice Hubbard model:: An effective model of κ-(BEDT-TTF) salts [J].

Kino, H ;

Kontani, H .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1998, 67 (11) :3691-3694

[10] NEW ORGANIC SUPERCONDUCTOR, LAMBDA-(BETS)(2)GACL4 AND METAL-INSULATOR-TRANSITION OF BETS CONDUCTOR WITH MAGNETIC ANIONS (BETS=BIS(ETHLENEDITHIO)TETRASELENAFULVALENE) [J].

KOBAYASHI, H ;

TOMITA, H ;

UDAGAWA, T ;

NAITO, T ;

KOBAYASHI, A .

SYNTHETIC METALS, 1995, 70 (1-3) :867-870

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