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Superconducting Characteristics of Filled Skutterudites LaPt<sub>4</sub>Ge<sub>12</sub> and PrPt<sub>4</sub>Ge<sub>12</sub>: <sup>73</sup>Ge-NQR/NMR Studies
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- Fumiya Kanetake
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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- Hidekazu Mukuda
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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- Yoshio Kitaoka
- Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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- Ko-ichi Magishi
- Institute of Socio-Arts and Sciences, The University of Tokushima, Tokushima 770-8502, Japan
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- Hitoshi Sugawara
- Department of Physics, Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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- Kohei M. Itoh
- Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
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- Eugene E. Haller
- University of California at Berkeley and Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.
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Description
We report on the superconducting characteristics of the filled skutterudites LaPt 4 Ge 12 ( T c =8.3 K) and PrPt 4 Ge 12 ( T c =7.9 K) by 73 Ge-nuclear quadrupole resonance (NQR) at a zero field. In PrPt 4 Ge 12 , the nuclear spin–lattice relaxation rate 73 (1/ T 1 ) has revealed a coherence peak just below T c , indicating that the superconductivity of PrPt 4 Ge 12 is accounted for in terms of the conventional BCS regime. The result was consistently reproduced by not only an isotropic s -wave gap model but also an anisotropic s -wave gap model with a point node. In the conventional superconductor LaPt 4 Ge 12 , the coherence peak in 73 (1/ T 1 ) is markedly suppressed owing to some damping effect of quasiparticles. We note that the T c s of LaPt 4 Ge 12 and PrPt 4 Ge 12 being higher than that of other R Pt 4 Ge 12 may be attributed to the larger density of states, not to some local anharmonic phonon modes derived from the possible rattling of R ions.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 79 (6), 063702-, 2010-06-15
Physical Society of Japan
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Details 詳細情報について
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- CRID
- 1360566396823681920
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- NII Article ID
- 210000108350
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- ISSN
- 13474073
- 00319015
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- Article Type
- journal article
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- Data Source
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- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE