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Superconductivity in Clathrates Ba24IV100 ( IV = Si and Ge ) with Rattling Motions

Published online by Cambridge University Press:  26 February 2011

Takeshi Rachi ,
Ryotaro Kumashiro ,
Hiroshi Fukuoka ,
Syoji Yamanaka  and
Katsumi Tanigaki
Takeshi Rachi
Affiliation:
rachi@sspns.phys.tohoku.ac.jp, Tohoku University, Physics, 6-3,Aramaki Aza-Aoba,Aoba-ku, Sendai, 980-8578, Japan, 022-795-6469, 022-795-6470
Ryotaro Kumashiro
Affiliation:
rkuma@sspns.phys.tohoku.ac.jp, Graduate School of Science, Tohoku University, Department of Physics, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
Hiroshi Fukuoka
Affiliation:
hfukuoka@hiroshima-u.ac.jp, Faculty of Engineering, Hiroshima University, Department of Applied Chemistry, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
Syoji Yamanaka
Affiliation:
syamana@hiroshima-u.ac.jp, Faculty of Engineering, Hiroshima University, Department of Applied Chemistry, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
Katsumi Tanigaki
Affiliation:
tanigaki@sspns.phys.tohoku.ac.jp, Graduate School of Science, Tohoku University, Department of Physics, 6-3, Aramaki Aza-Aoba, Aoba-ku, Sendai, 980-8578, Japan
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Abstract

Both Ba24Si100 and Ba24Ge100 with crystallographically identical structure are the superconductors whose critical temperatures are 1.45 and 0.27 K, respectively. Intriguingly, physical properties of the both compounds are extremely different. The observed differences are considered to be associated with Ba rattling motions. We have exemplified such unique motions in terms of x-ray diffraction data using MEM/Rietveld analyses. We present these exotic systems especially focusing on the relation between superconductivity and the rattling phonons.

Keywords

superconductingelectron-phonon interactionsnanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 988: Symposium QQ – Solid-State Chemistry of Inorganic Materials VI , 2006 , 0988-QQ07-02
Copyright
Copyright © Materials Research Society 2007

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