Superconducting state of filled-skutterudite RPt4Ge12 (R=La, Pr):73Ge-NQR studies

Superconducting state of filled-skutterudite RPt4Ge12 (R=La, Pr):73Ge-NQR studies

We report 73Ge-NQR studies on filled-skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under zero external field. In PrPt4Ge12, the measurement of the nuclear spin-lattice relaxation rate 1/T1 has revealed a distinct coherence peak just below Tc followed by an exponential decrease well below Tc,...

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Bibliographic Details
Published in:Physica. C, Superconductivity Vol. 470; no. SUP1; pp. S703 - S704
Main Authors: Kanetake, F., Mukuda, H., Kitaoka, Y., Sugawara, H., Magishi, K., Itoh, K.M., Haller, E.E.
Format: Journal Article Conference Proceeding
Language:English
Published: Amsterdam Elsevier B.V 01-12-2010
Elsevier
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Filled-skutterudite
NMR
NQR
Physics
Properties of type I and type II superconductors
Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.)
RPt4Ge12
Superconductivity
NMR
Filled-skutterudite
RPt4Ge12
NQR
Superconductivity
Filled skutterudites
Electron-phonon interactions
Quasiparticles
Energy gap
Superconductors
s wave superconductivity
Anisotropy
Spin-lattice relaxation
Nuclear quadrupole resonance
RPt
Nuclear magnetic resonance
Fermi surface
Ge
Germanides
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Summary:We report 73Ge-NQR studies on filled-skutterudite superconductors LaPt4Ge12 and PrPt4Ge12 under zero external field. In PrPt4Ge12, the measurement of the nuclear spin-lattice relaxation rate 1/T1 has revealed a distinct coherence peak just below Tc followed by an exponential decrease well below Tc, evidencing that PrPt4Ge12 is an s-wave superconductor with the isotropic gap in a weak-coupling regime. In LaPt4Ge12, the 1/T1 exhibits the exponential decrease well below Tc, suggesting the isotropic s-wave superconductivity. Even though 73Ge-NQR-1/T1 in LaPt4Ge12 has been measured under zero field, its coherence peak was absent, which contrasts with the result in Pr-compound. This may point to a possible anisotropy in the Fermi surface and/or some damping effect of quasiparticles in association with electron–phonon interactions.
ISSN:0921-4534
1873-2143
DOI:10.1016/j.physc.2009.11.127