Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system

T. J. Liu; X. Ke; B. Qian; J. Hu; D. Fobes; E. K. Vehstedt; H. Pham; J. H. Yang; M. H. Fang; L. Spinu; P. Schiffer; Y. Liu; Z. Q. Mao

doi:10.1103/PhysRevB.80.174509

Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system

Superconductivity 2015-05-13 v4

Authors: T. J. Liu , X. Ke , B. Qian , J. Hu , D. Fobes , E. K. Vehstedt , H. Pham , J. H. Yang , M. H. Fang , L. Spinu , P. Schiffer , Y. Liu , Z. Q. Mao

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

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.

Keywords

excess iron charge carrier localization Fe1+y(Te,Se) superconductor interstitial site magnetic coupling short-range magnetic order

Cite

@article{arxiv.0904.0824,
  title  = {Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system},
  author = {T. J. Liu and X. Ke and B. Qian and J. Hu and D. Fobes and E. K. Vehstedt and H. Pham and J. H. Yang and M. H. Fang and L. Spinu and P. Schiffer and Y. Liu and Z. Q. Mao},
  journal= {arXiv preprint arXiv:0904.0824},
  year   = {2015}
}

Comments

15 pages, 6 figures accepted for publication in PRB

Charge carrier localization induced by excess Fe in the Fe1+y(Te,Se) superconductor system

Abstract

Keywords

Cite

Comments

Related papers