Intrinsic and structural isotope effects in iron-based superconductors

被引：21
|
作者：
Khasanov, R. [1 ]
Bendele, M. [1 ,2 ]
Bussmann-Holder, A. [3 ]
Keller, H. [2 ]
机构：
[1] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
[2] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
[3] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
来源：
PHYSICAL REVIEW B | 2010年 / 82卷 / 21期
关键词：
CUPRATE SUPERCONDUCTORS; TEMPERATURE;
D O I：
10.1103/PhysRevB.82.212505
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The currently available results of the isotope effect on the superconducting transition temperature T(c) in Fe-based high-temperature superconductors (HTSs) are highly controversial. The values of the Fe isotope effect exponent alpha(Fe) for various families of Fe-based HTS were found to be as well positive, as negative, or even be exceedingly larger than the BCS value alpha(BCS) = 0.5. Here we emphasize that the Fe isotope substitution causes small structural modifications which, in turn, affect T(c). Upon correcting the isotope effect exponent for these structural effects, an almost unique value of alpha similar to 0.35-0.4 is observed for at least three different families of Fe-based HTS.
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页数：4
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