Sc doping of MgB2:: the structural and electronic properties of Mg1-xScxB2

被引：25

作者：

Agrestini, S

Metallo, C

Filippi, M

Campi, G

Sanipoli, C

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

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

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

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2004年 / 65卷 / 8-9期

关键词：

superconductivity;

D O I：

10.1016/j.jpcs.2003.09.033

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We have investigated the effect of electron doping on the superconducting properties of MgB2. For the purpose we have synthesized several samples along the Mg1-xScxB2 section. The X-ray diffraction measurements reveal small changes in the lattice parameters suggesting that the Sc doping could be considered to simply fill the boron sigma bands. Radio frequency surface resistivity measurements has been used to obtain the variation of T-c with Sc doping. Increasing the Sc content, the experimental T-c diverges from the T-c predicted by the BCS single band theory showing the key role of interchannel pairing near a shape resonance. (C) 2004 Elsevier Ltd. All rights reserved.

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页码：1479 / 1484

页数：6

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