Raman Investigations of C-, Li- and Mn-Doped MgB2

被引：6

作者：

Parisiades, P. ^{[1
]}

Liarokapis, E. ^{[1
]}

Zhigadlo, N. D. ^{[2
]}

Katrych, S. ^{[2
]}

Karpinski, J. ^{[2
]}

机构：

[1] Natl Tech Univ Athens, Dept Phys, Athens 15780, Greece

[2] ETH, Solid State Phys Lab, CH-8093 Zurich, Switzerland

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2009年 / 22卷 / 02期

关键词：

Superconductivity; MgB2; Raman spectroscopy;

D O I：

10.1007/s10948-008-0402-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A systematic micro-Raman study of the atomic substitution effects has been carried out on single crystals of MgB2, including C-doping for B and Li- or Mn-doping for Mg. The spectra of C (electron)-doped compounds exhibit remarkable differentiations with respect to pure MgB2, and new bands of E-2g and A(1g)/B-1g symmetry play the dominant role in the substituted spectra. We have observed a two-mode behavior apparently driven by the electron-phonon coupling strength and associated with an electronic topological transition of the sigma bands. On the other hand, Li (hole) and Mn (magnetic impurity) doping do not seem to affect the well-defined broad band at 600 cm(-1). Combining Raman investigations and T (c) -interdependence shows that this band is not related with the transition temperature, questioning its relationship to superconductivity in diborides.

引用

页码：169 / 172

页数：4

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