Far-infrared optical conductivity gap in superconducting MgB2 films -: art. no. 027003

被引：102

作者：

Kaindl, RA ^{[1
]}

Carnahan, MA

Orenstein, J

Chemla, DS

Christen, HM

Zhai, HY

Paranthaman, M

Lowndes, DH

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37931 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 02期

关键词：

D O I：

10.1103/PhysRevLett.88.027003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first study of the optical conductivity of MgG(2) covering the range of its lowest-energy superconducting gap. Terahertz time-domain spectroscopy is utilized to determine the complex, frequency-dependent conductivity sigma(omega)) of thin films. The imaginary part reveals an inductive response due to the emergence of the superconducting condensate. The real part exhibits a strong depletion of oscillator strength near 5 meV resulting from the opening of a superconducting energy gap. The gap ratio of 2Delta(0)/k(B)T(C) approximate to 1.9 is well below the weak-coupling value, pointing to complex behavior in this novel superconductor.

引用

页数：4

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