Local lattice dynamics and isotope effect in yttrium diboride probed by extended x-ray absorption fine structure spectroscopy

被引：7

作者：

Chu, W. S. ^{[1
,2
]}

Marcelli, A. ^{[3
]}

Hu, T. D. ^{[1
]}

Wei, S. Q. ^{[2
]}

Liu, W. H. ^{[4
]}

Saini, N. L. ^{[5
,6
]}

Bianconi, A. ^{[5
,6
]}

Wu, Z. Y. ^{[1
,2
,7
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230026, Peoples R China

[3] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[4] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China

[5] Univ Roma La Sapienza, I-00185 Rome, Italy

[6] Unita INFM, I-00185 Rome, Italy

[7] Chinese Acad Sci, TPCSF, Beijing 100049, Peoples R China

来源：

NEW JOURNAL OF PHYSICS | 2009年 / 11卷

基金：

中国国家自然科学基金;

关键词：

SUPERCONDUCTIVITY; MGB2; VIBRATIONS;

D O I：

10.1088/1367-2630/11/8/083005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The lattice vibration properties and the boron isotope effect have been studied in YB2 by using temperature-dependent extended x-ray absorption fine structure (EXAFS). The data show anomalous behavior of the Debye-Waller factor of the Y-B pair due to the superposition of an optical mode associated with the boron sublattice and an acoustic mode corresponding to the yttrium sublattice. We claim that the observed decoupling between metal and boron vibrations is responsible for the lower transition temperature compared to MgB2. The analysis of the boron isotope effect confirms also that the B-B vibration mode plays a key role in the electron-phonon coupling.

引用

页数：7

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