Phonons in MgB2 by polarized Raman scattering on single crystals -: art. no. 140503

被引：68

作者：

Hlinka, J ^{[1
]}

Gregora, I

Pokorny, J

Plecenik, A

Kús, P

Satrapinsky, L

Benacka, S

机构：

[1] ASCR, Inst Phys, Prague, Czech Republic

[2] SAS, Inst Elect Engn, Bratislava, Slovakia

[3] Comenius Univ, FMFI, Dept Solid State Phys, Bratislava, Slovakia

来源：

PHYSICAL REVIEW B | 2001年 / 64卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.64.140503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This paper presents a detailed Raman scattering study of the unusually broad E-2g phonon mode in MgB2 crystal. It is shown by polarized Raman scattering on a few-micron-size crystallites with natural faces that the observed broad Raman feature really does obey the selection rules of an E-2g mode. Raman spectra on high quality polycrystalline superconducting MgB2 wires reveal a very symmetric E-2g phonon line near 615 cm(-1) with the room temperature linewidth of 260 cm(-1) only. Additional scattering of different polarization dependence, observed in certain crystallites, is interpreted as weighted phonon density of states induced by lattice imperfections.

引用

页码：1405031 / 1405034

页数：4

共 12 条

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An, J.M., 2001, American Institute of Physics Inc. (86)

[2] Coexistence of covalent and metallic bonding in the boron intercalation superconductor MgB2 -: art. no. 092503 [J].