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  Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2

Kittaka, S., Aoki, Y., Shimura, Y., Sakakibara, T., Seiro, S., Geibel, C., et al. (2016). Thermodynamic study of gap structure and pair-breaking effect by magnetic field in the heavy-fermion superconductor CeCu2Si2. Physical Review B, 94(5): 054514, pp. 1-9. doi:10.1103/PhysRevB.94.054514.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-4DE9-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1A2C-1
Genre: Journal Article

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Kittaka, Shunichiro1, Author
Aoki, Yuya1, Author
Shimura, Yasuyuki1, Author
Sakakibara, Toshiro1, Author
Seiro, Silvia2, Author              
Geibel, Christoph3, Author              
Steglich, Frank4, Author              
Tsutsumi, Yasumasa1, Author
Ikeda, Hiroaki1, Author
Machida, Kazushige1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
3Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
4Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: This paper presents the results of specific-heat and magnetization measurements, in particular their field-orientation dependence, on the first discovered heavy-fermion superconductor CeCu2Si2 (T-c similar to 0.6K). We discuss the superconducting gap structure and the origin of the anomalous pair-breaking phenomena, leading, e.g., to the suppression of the upper critical field H-c2, found in the high-field region. The data show that the anomalous pair breaking becomes prominent below about 0.15 K in any field direction, but occurs closer to H-c2 for H parallel to c. The presence of this anomaly is confirmed by the fact that the specific-heat and magnetization data satisfy standard thermodynamic relations. Concerning the gap structure, field-angle dependencies of the low-temperature specific heat within the ab and ac planes do not show any evidence for gap nodes. From microscopic calculations in the framework of a two-band full-gap model, the power-law-like temperature dependencies of C and 1/T-1, reminiscent of nodal superconductivity, have been reproduced reasonably. These facts further support multiband full-gap superconductivity in CeCu2Si2.

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Language(s): eng - English
 Dates: 2016-08-192016-08-19
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 94 (5) Sequence Number: 054514 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008