Terahertz Conductivity of the Heavy-Fermion State in CeCoIn5

被引：8

作者：

Scheffler, Marc ^{[1
]}

Weig, Thomas ^{[1
]}

Dressel, Martin ^{[1
]}

Shishido, Hiroaki ^{[2
]}

Mizukami, Yuta ^{[2
]}

Terashima, Takahito ^{[3
]}

Shibauchi, Takasada ^{[2
]}

Matsuda, Yuji ^{[2
]}

机构：

[1] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany

[2] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[3] Kyoto Univ, Res Ctr Low Temp & Mat Sci, Kyoto 6068502, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 04期

关键词：

CeCoIn5; THz conductivity; optical conductivity; heavy fermion; thin film; THIN-FILMS; SUPERCONDUCTIVITY; SPECTROSCOPY; RELAXATION; DEPOSITION; DYNAMICS; UNI2AL3; UPD2AL3; LATTICE; CEPD3;

D O I：

10.7566/JPSJ.82.043712

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The optical properties of thin films of the heavy-fermion compound CeCoIn5, which were deposited by molecular beam epitaxy onto MgF2 substrates, have been studied at frequencies 7 to 45 cm(-1) (corresponding to 0.2 to 1.3 THz) and temperatures 2 to 300 K. We observe an electrodynamic behavior which is typical for heavy fermions, namely Drude-like conductivity with a relaxation rate at rather low frequencies. This relaxation rate increases almost linearly with temperature up to at least 30 K. The coherent heavy-fermion state, characterized by an increase of the effective mass, continuously evolves upon cooling and is not fully developed for temperatures as low as 5 K.

引用

页数：5

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