Pressure and isotope effect on the anisotropy of MgB2 -: art. no. 054501
Pressure and isotope effect on the anisotropy of MgB2 -: art. no. 054501
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DOI：
10.1103/physrevb.72.054501
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发表时间：
2005-08-01
影响因子：
3.7
通讯作者：
Di Castro, D
中科院分区：
文献类型：
--
作者：
Schneider, T;Di Castro, D
我们分析了压力和硼同位素对 T-c 附近磁化强度的温度依赖性影响的数据。援引固定磁场下磁化强度的通用标度关系，结果表明，由压力或硼同位素交换引起的 T-c 相对位移基本上反映了各向异性的相对位移。这揭示了各向异性 II 型超导体的独特通用属性，在各向同性情况下不存在。对于 MgB2 来说，这意味着由于压力或同位素交换而导致的费米表面拓扑的重正化是由控制各向异性的机制主导的。
We analyze the data for the pressure and boron isotope effect on the temperature dependence of the magnetization near T-c. Invoking the universal scaling relation for the magnetization at fixed magnetic field it is shown that the relative shift of T-c, induced by pressure or boron isotope exchange, mirrors essentially that of the anisotropy. This uncovers a unique generic property of anisotropic type-II superconductors, nonexistent in the isotropic case. For MgB2 it implies that the renormalization of the Fermi-surface topology due to pressure or isotope exchange is dominated by a mechanism controlling the anisotropy.