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; Y. Liu; Z. Q. Mao

doi:10.1103/PhysRevB.80.174509

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, Y. Liu, Z. Q. Mao

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191 Scopus citations

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 language	English (US)
Article number	174509
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	80
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.80.174509
State	Published - Nov 9 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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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, Y., & Mao, Z. Q. (2009). Charge-carrier localization induced by excess Fe in the superconductor Fe1+y Te1-x Sex. Physical Review B - Condensed Matter and Materials Physics, 80(17), Article 174509. https://doi.org/10.1103/PhysRevB.80.174509

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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.",

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doi = "10.1103/PhysRevB.80.174509",

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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, Y.

AU - Mao, Z. Q.

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

Abstract

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