Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex

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, Ying Liu, Zhiqiang Mao

Research output: Contribution to journalArticle

137 Citations (Scopus)

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.

Original languageEnglish (US)
Article number174509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number17
DOIs
StatePublished - Nov 9 2009

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Thermal variables measurement
Magnetic couplings
Electronic states
Superconductivity
Charge carriers
Magnetic susceptibility
Superconducting materials
Specific heat
charge carriers
Hall effect
interstitials
heat measurement
superconductivity
specific heat
magnetic permeability
electrical resistivity
electronics

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Liu, T. J. ; Ke, X. ; Qian, B. ; Hu, J. ; Fobes, D. ; Vehstedt, E. K. ; Pham, H. ; Yang, J. H. ; Fang, M. H. ; Spinu, L. ; Schiffer, P. ; Liu, Ying ; Mao, Zhiqiang. / Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex. In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 17.
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Liu, TJ, Ke, X, Qian, B, Hu, J, Fobes, D, Vehstedt, EK, Pham, H, Yang, JH, Fang, MH, Spinu, L, Schiffer, P, Liu, Y & Mao, Z 2009, 'Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex', Physical Review B - Condensed Matter and Materials Physics, vol. 80, no. 17, 174509. https://doi.org/10.1103/PhysRevB.80.174509

Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex. / Liu, T. J.; Ke, X.; Qian, B.; Hu, J.; Fobes, D.; Vehstedt, E. K.; Pham, H.; Yang, J. H.; Fang, M. H.; Spinu, L.; Schiffer, P.; Liu, Ying; Mao, Zhiqiang.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 17, 174509, 09.11.2009.

Research output: Contribution to journalArticle

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T1 - Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex

AU - Liu, T. J.

AU - Ke, X.

AU - Qian, B.

AU - Hu, J.

AU - Fobes, D.

AU - Vehstedt, E. K.

AU - Pham, H.

AU - Yang, J. H.

AU - Fang, M. H.

AU - Spinu, L.

AU - Schiffer, P.

AU - Liu, Ying

AU - Mao, Zhiqiang

PY - 2009/11/9

Y1 - 2009/11/9

N2 - 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.

AB - 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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