Correlation between local vibrations and metal mass in AlB2-type transition-metal diborides

被引：10

作者：

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

Zhang, S. ^{[1
,2
]}

Yu, M. J. ^{[1
]}

Zheng, L. R. ^{[1
]}

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

Zhao, H. F. ^{[1
]}

Marcelli, A. ^{[3
,4
]}

Bianconi, A. ^{[5
]}

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

Liu, W. H. ^{[2
]}

Wu, Z. Y. ^{[1
,2
,6
]}

机构：

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

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

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

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

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

[6] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China

来源：

JOURNAL OF SYNCHROTRON RADIATION | 2009年 / 16卷

基金：

中国国家自然科学基金;

关键词：

EXAFS; diboride; superconductor; ABSORPTION FINE-STRUCTURE; SUPERCONDUCTIVITY; FREQUENCY; MGB2;

D O I：

10.1107/S0909049508030628

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Lattice vibrations have been investigated in TiB2, ZrB2 and HfB2 by temperature-dependent extended X-ray absorption fine structure (EXAFS) experiments. Data clearly show that the EXAFS oscillations are characterized by an anomalous behavior of the Debye-Waller factor of the transition-metal boron pair, which is suggested to be associated with a superposition of an optical mode corresponding to phonon vibrations induced by the B sublattice and an acoustic mode corresponding to the transition-metal (TM) sublattice. Data can be interpreted as a decoupling of the metal and boron vibrations observed in these transition-metal diborides (TMB2), a mechanism that may be responsible for the significant reduction of the superconducting transition temperature observed in these systems with respect to the parent MgB2 compound. The vibrational behavior of TM-TM bonds has also been investigated to study the occurrence of anisotropy and anomalies in the lattice vibrational behavior of TM-TM bonds.

引用

页码：30 / 37

页数：8

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