Tunneling spectroscopy of layered nitride superconductors MNCl0.7 (M = Hf and Zr)

被引：3

作者：

Takasaki, T.

Ekino, T.

Yamanaka, S.

机构：

[1] Hiroshima Univ, Fac Integrated Arts & Sci, Higashihiroshima 7398521, Japan

[2] Hiroshima Univ, Grad Sch Adv Sci Matter, Higashihiroshima 7398530, Japan

[3] Hiroshima Univ, Grad Sch Engn, Higashihiroshima 7398527, Japan

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 2006年 / 445卷

关键词：

tunneling spectroscopy; superconducting gap; HfNCl; ZrNCl;

D O I：

10.1016/j.physc.2006.03.082

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have carried out tunneling measurements for MNCl0.7 (M = Hf and Zr) with T-c similar to 24 K and similar to 14 K, respectively, using break-junction technique. Observed gap structures can be reproduced by the superconductor-insulator-superconductor (SIS) conductance with the BCS density of states. The estimated gap ratio 2 Delta/k(B)T(c) >= 5 for both compounds is turned out to be larger than that of the conventional superconductors. (c) 2006 Elsevier B.V. All rights reserved.

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页码：77 / 79

页数：3

相关论文

共 15 条

[1] DIRECT MEASUREMENT OF QUASIPARTICLE-LIFETIME BROADENING IN A STRONG-COUPLED SUPERCONDUCTOR [J].

DYNES, RC ;

NARAYANAMURTI, V ;

GARNO, JP .

PHYSICAL REVIEW LETTERS, 1978, 41 (21) :1509-1512

[2] TUNNELING EVIDENCE FOR THE QUASI-PARTICLE GAP IN KONDO SEMICONDUCTORS CENISN AND CERHSB [J].

EKINO, T ;

TAKABATAKE, T ;

TANAKA, H ;

FUJII, H .

PHYSICAL REVIEW LETTERS, 1995, 75 (23) :4262-4265

[3] Tunneling spectroscopy of the superconducting gap in MgB2 -: art. no. 094504 [J].

Ekino, T ;

Takasaki, T ;

Muranaka, T ;

Akimitsu, J ;

Fujii, H .

PHYSICAL REVIEW B, 2003, 67 (09)

[4] Tunneling spectroscopy of the electron-doped layered superconductor Li0.48(THF)0.3HfNCl [J].

Ekino, T ;

Takasaki, T ;

Fujii, H ;

Yamanaka, S .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 2003, 388 :573-574

[5] Electronic structures and instabilities of ZrNCl and HfNCl: implications for superconductivity in the doped compounds [J].

Felser, C ;

Seshadri, R .

JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (02) :459-464

[6] Two-dimensional nature of superconductivity in the intercalated layered systems LixHfNCl and LixZrNCl:: Muon spin relaxation and magnetization measurements -: art. no. 134522 [J].

Ito, T ;

Fudamoto, Y ;

Fukaya, A ;

Gat-Malureanu, IM ;

Larkin, MI ;

Russo, PL ;

Savici, A ;

Uemura, YJ ;

Groves, K ;

Breslow, R ;

Hotehama, K ;

Yamanaka, S ;

Kyriakou, P ;

Rovers, M ;

Luke, GM ;

Kojima, KM .

PHYSICAL REVIEW B, 2004, 69 (13) :134522-1

[7] Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+δ [J].

Lang, KM ;

Madhavan, V ;

Hoffman, JE ;

Hudson, EW ;

Eisaki, H ;

Uchida, S ;

Davis, JC .

NATURE, 2002, 415 (6870) :412-416

[8] Superconductivity at 39 K in magnesium diboride [J].

Nagamatsu, J ;

Nakagawa, N ;

Muranaka, T ;

Zenitani, Y ;

Akimitsu, J .

NATURE, 2001, 410 (6824) :63-64

[9] High-pressure study of layered nitride superconductors [J].

Taguchi, Y ;

Hisakabe, M ;

Ohishi, Y ;

Yamanaka, S ;

Iwasa, Y .

PHYSICAL REVIEW B, 2004, 70 (10) :104506-1

[10] Tunneling spectroscopy of deintercalated layered nitride superconductor ZrNCl0.7 [J].

Takasaki, T ;

Ekino, T ;

Fujii, H ;

Yamanaka, S .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2005, 74 (09) :2586-2591