Substitution of Sc for Mg in MgB2:: Effects on transition temperature and Kohn anomaly -: art. no. 134514

被引：65

作者：

Agrestini, S

Metallo, C

Filippi, M

Simonelli, L

Campi, G

Sanipoli, C

Liarokapis, E

De Negri, S

Giovannini, M

Saccone, A

Latini, A

Bianconi, A

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] Natl Tech Univ Athens, Dept Appl Math & Phys, GR-15780 Athens, Greece

[3] Univ Genoa, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy

[4] Univ Roma La Sapienza, Dipartimento Chim, I-00185 Rome, Italy

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

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.70.134514

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Here we report the synthesis and characterization of Mg1-xScxB2 (0.12<x<0.27) system, with critical temperature in the range of 30>T-c>6 K. We find that the Sc doping moves the chemical potential through the 2-D/3-D electronic topological transition (ETT) in the sigma band where the "shape resonance" of interband pairing occurs. In the 3-D regime beyond the ETT we observe a hardening of the E-2g Raman mode with a significant line-width narrowing due to the suppression of the Kohn anomaly over the range 0<q<2k(F).

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页码：134514 / 1

页数：5

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