Calculated elastic and electronic properties of MgB2 at high pressures

被引:89
作者
Loa, I [1 ]
Syassen, K [1 ]
机构
[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
关键词
superconductors; crystal binding and equation of state; electronic band structure; metals;
D O I
10.1016/S0038-1098(01)00095-3
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The effect of high pressure on structural and electronic properties of the novel superconductor MgB2 has been calculated using the full-potential linearized augmented-plane-wave method. Despite the layered crystal structure of MgB2 nearly isotropic compression (bulk modulus B-o = 140.1(6) GPa) is found with only a 1.2% decrease of the c/a ratio at 10 GPa. The effect of pressure on the critical temperature has been estimated on the basis of BCS theory and good agreement with experimental data is found. Our results suggest that it is a combination of increasing phonon frequency and decreasing electronic density of states at the Fermi level which leads to the observed decrease of the critical temperature under pressure. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:279 / 282
页数:4
相关论文
共 18 条
[1]  
AN JM, 2001, CONDMAT0102391
[2]  
BELASHCHENKO KD, 2001, CONDMAT0102290
[3]   FINITE STRAIN ISOTHERM AND VELOCITIES FOR SINGLE-CRYSTAL AND POLYCRYSTALLINE NACL AT HIGH-PRESSURES AND 300-DEGREE-K [J].
BIRCH, F .
JOURNAL OF GEOPHYSICAL RESEARCH, 1978, 83 (NB3) :1257-1268
[4]  
BLAHA P, 1999, WIEN97 FULL POTENTIA
[5]   Boron isotope effect in superconducting MgB2 [J].
Bud'ko, SL ;
Lapertot, G ;
Petrovic, C ;
Cunningham, CE ;
Anderson, N ;
Canfield, PC .
PHYSICAL REVIEW LETTERS, 2001, 86 (09) :1877-1880
[6]   Thermodynamic and transport properties of superconducting Mg10B2 [J].
Finnemore, DK ;
Ostenson, JE ;
Bud'ko, SL ;
Lapertot, G ;
Canfield, PC .
PHYSICAL REVIEW LETTERS, 2001, 86 (11) :2420-2422
[7]   GRAPHITE UNDER PRESSURE - EQUATION OF STATE AND 1ST-ORDER RAMAN MODES [J].
HANFLAND, M ;
BEISTER, H ;
SYASSEN, K .
PHYSICAL REVIEW B, 1989, 39 (17) :12598-12603
[8]  
HIRSCH JE, 2001, CONDMAT0102115V3
[9]  
Ivanovskii AL, 2000, RUSS J INORG CHEM+, V45, P1234
[10]   THE PREPARATION AND STRUCTURE OF MAGNESIUM BORIDE, MGB2 [J].
JONES, ME ;
MARSH, RE .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1954, 76 (05) :1434-1436