Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi

T. Tamegai; K. Uozato; S. Kasahara; T. Nakagawa; M. Tokunaga

doi:10.1016/j.physc.2005.01.020

Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi

T. Tamegai, K. Uozato, S. Kasahara, T. Nakagawa, M. Tokunaga

Research output: Contribution to journal › Conference article › peer-review

14 Citations (Scopus)

Abstract

In order to get some insight into the origin of the anomalous angular dependence of H_c2 in a layered intermetallic compound CaAlSi, electronic, superconducting, and structural properties are compared between CaAlSi and CaGaSi. The angular dependence of H_c2 in CaGaSi is well described by the anisotropic GL model. Parallel to this finding, the pronounced lattice modulation accompanying the superstructure along the c-axis in CaAlSi is absent in CaGaSi. A relatively large specific heat jump at the superconducting transition in CaAlSi compared with CaGaSi indicates the presence of strong electron-phonon coupling in CaAlSi, which may cause the superstructure and the anomalous angular dependence of H_c2.

Original language	English
Pages (from-to)	208-212
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	426-431
Issue number	I
DOIs	https://doi.org/10.1016/j.physc.2005.01.020
Publication status	Published - Oct 1 2005
Externally published	Yes
Event	Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity - Duration: Nov 23 2004 → Nov 25 2004

Keywords

Anisotropy
CaAlSi
CaGaSi
Superstructure
Upper critical field

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2005.01.020

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title = "Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi",

abstract = "In order to get some insight into the origin of the anomalous angular dependence of Hc2 in a layered intermetallic compound CaAlSi, electronic, superconducting, and structural properties are compared between CaAlSi and CaGaSi. The angular dependence of Hc2 in CaGaSi is well described by the anisotropic GL model. Parallel to this finding, the pronounced lattice modulation accompanying the superstructure along the c-axis in CaAlSi is absent in CaGaSi. A relatively large specific heat jump at the superconducting transition in CaAlSi compared with CaGaSi indicates the presence of strong electron-phonon coupling in CaAlSi, which may cause the superstructure and the anomalous angular dependence of Hc2.",

keywords = "Anisotropy, CaAlSi, CaGaSi, Superstructure, Upper critical field",

author = "T. Tamegai and K. Uozato and S. Kasahara and T. Nakagawa and M. Tokunaga",

note = "Funding Information: We thank M. Ichihara for TEM observations. This work is supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology. ; Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity ; Conference date: 23-11-2004 Through 25-11-2004",

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doi = "10.1016/j.physc.2005.01.020",

language = "English",

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journal = "Physica C: Superconductivity and its Applications",

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TY - JOUR

T1 - Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi

AU - Tamegai, T.

AU - Uozato, K.

AU - Kasahara, S.

AU - Nakagawa, T.

AU - Tokunaga, M.

N1 - Funding Information: We thank M. Ichihara for TEM observations. This work is supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology.

PY - 2005/10/1

Y1 - 2005/10/1

N2 - In order to get some insight into the origin of the anomalous angular dependence of Hc2 in a layered intermetallic compound CaAlSi, electronic, superconducting, and structural properties are compared between CaAlSi and CaGaSi. The angular dependence of Hc2 in CaGaSi is well described by the anisotropic GL model. Parallel to this finding, the pronounced lattice modulation accompanying the superstructure along the c-axis in CaAlSi is absent in CaGaSi. A relatively large specific heat jump at the superconducting transition in CaAlSi compared with CaGaSi indicates the presence of strong electron-phonon coupling in CaAlSi, which may cause the superstructure and the anomalous angular dependence of Hc2.

AB - In order to get some insight into the origin of the anomalous angular dependence of Hc2 in a layered intermetallic compound CaAlSi, electronic, superconducting, and structural properties are compared between CaAlSi and CaGaSi. The angular dependence of Hc2 in CaGaSi is well described by the anisotropic GL model. Parallel to this finding, the pronounced lattice modulation accompanying the superstructure along the c-axis in CaAlSi is absent in CaGaSi. A relatively large specific heat jump at the superconducting transition in CaAlSi compared with CaGaSi indicates the presence of strong electron-phonon coupling in CaAlSi, which may cause the superstructure and the anomalous angular dependence of Hc2.

KW - Anisotropy

KW - CaAlSi

KW - CaGaSi

KW - Superstructure

KW - Upper critical field

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U2 - 10.1016/j.physc.2005.01.020

DO - 10.1016/j.physc.2005.01.020

M3 - Conference article

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SN - 0921-4534

VL - 426-431

SP - 208

EP - 212

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - I

T2 - Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity

Y2 - 23 November 2004 through 25 November 2004

ER -

Comparative study of anisotropic superconductivity in CaAlSi and CaGaSi

Abstract

Keywords

ASJC Scopus subject areas

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