Superconductivity and physical properties of Ba24Si100 determined from electric transport, specific-heat capacity, and magnetic susceptibility measurements

Rachi Takeshi

Yoshino Harukazu

Kumashiro Ryotaro

Katajima Masaki

Kobayashi Kensuke

Yokogawa Keiichi

Murata Keizo

Kimura Noriaki

Aoki Haruyoshi

Fukuoka Hiroshi

Yamanaka Shoji

Shimotani Hidekazu

Takenobu Taishi

Iwasa Yoshihiro

Sasaki Takahiro

Kobayashi Norio

Miyazaki Yuji

Saito Kazuya

Guo Fang Zhun

Kobayashi Keisuke

Osaka Keiichi

Kato Kenichi

Tanaka Masaki

Tanigaki Katsumi

Physical Review B - Condensed Matter and Materials Physics

Both Ba24Si100 and Ba24Ge100 with crystallographically identical structure are found to be superconducting at 1.4 and 0.27 K, respectively. Physical properties of this superconductor Ba24Si100 are studied by electric transport, specific heat capacity, and magnetic susceptibility measurements. The density of states at the Fermi level NEF=0.148 states eV-1(Siatom)-1 and a distinct jump of Cp at the superconducting transition temperature ΔCp=0.272JK-1mol-1 are obtained. An exponential fit of Cp below the superconducting states gives an energy gap 2Δ=0.423meV and shows that this is a superconductor having s-wave character or isotropic energy gap. On the basis of our experimental data other important physical parameters are also derived.

Physics [ 420 ]

eng

American Physical Society

Copyright (c) 2005 American Physical Society

[NCID] AA11187113

[ISSN] 1098-0121

[DOI] 10.1103/PhysRevB.72.144504

[DOI] http://dx.doi.org/10.1103/PhysRevB.72.144504