Charge-carrier localization induced by excess Fe in the superconductor Fe1+yTe1-xSex

被引：230
作者：
Liu, T. J. [1 ]
Ke, X. [2 ,3 ]
Qian, B. [1 ]
Hu, J. [1 ]
Fobes, D. [1 ]
Vehstedt, E. K. [1 ]
Pham, H. [4 ,5 ]
Yang, J. H. [6 ]
Fang, M. H. [1 ,6 ]
Spinu, L. [4 ,5 ]
Schiffer, P. [2 ,3 ]
Liu, Y. [2 ,3 ]
Mao, Z. Q. [1 ]
机构：
[1] Tulane Univ, Dept Phys, New Orleans, LA 70118 USA
[2] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[3] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA
[4] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA
[5] Univ New Orleans, Dept Phys, New Orleans, LA 70148 USA
[6] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China
来源：
PHYSICAL REVIEW B | 2009年 / 80卷 / 17期
关键词：
electrical resistivity; Hall effect; interstitials; iron compounds; localised states; magnetic susceptibility; specific heat; stoichiometry; superconducting materials; MAGNETIC ORDER; PHASE-DIAGRAM; PRESSURE;
D O I：
10.1103/PhysRevB.80.174509
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated the effect of Fe nonstoichiometry on properties of the Fe1+y(Te,Se) superconductor system by means of resistivity, Hall coefficient, magnetic susceptibility, and specific-heat measurements. We find that the excess Fe at interstitial sites of the (Te, Se) layers not only suppresses superconductivity but also results in a weakly localized electronic state. We argue that these effects originate from the magnetic coupling between the excess Fe and the adjacent Fe square-planar sheets, which favors a short-range magnetic order.
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页数：6
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