Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al.

Zhijun Xu; J. A. Schneeloch; Ming Yi; Yang Zhao; Masaaki Matsuda; D. M. Pajerowski; Songxue Chi; R. J. Birgeneau; Genda Gu; J. M. Tranquada; Guangyong Xu

doi:10.1103/PhysRevB.97.214511

Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al.

Zhijun Xu, J. A. Schneeloch, Ming Yi, Yang Zhao, Masaaki Matsuda, D. M. Pajerowski, Songxue Chi, R. J. Birgeneau, Genda Gu, J. M. Tranquada, Guangyong Xu

Spectroscopy

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Abstract

In as-grown bulk crystals of Fe1+yTe1-xSex with x≲0.3, excess Fe (y>0) is inevitable and correlates with a suppression of superconductivity. At the same time, there remains the question as to whether the character of the antiferromagnetic correlations associated with the enhanced anion height above the Fe planes in Te-rich samples is compatible with superconductivity. To test this, we have annealed as-grown crystals with x=0.1 and 0.2 in Te vapor, effectively reducing the excess Fe and inducing bulk superconductivity. Inelastic neutron scattering measurements reveal low-energy magnetic excitations consistent with short-range correlations of the double-stripe type; nevertheless, cooling into the superconducting state results in a spin gap and a spin resonance, with the extra signal in the resonance being short range with a mixed single-stripe/double-stripe character, which is different than other iron-based superconductors. The mixed magnetic character of these superconducting samples does not appear to be trivially explainable by inhomogeneity.

Original language	English
Article number	214511
Journal	Physical Review B
Volume	97
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.97.214511
State	Published - Jun 14 2018

Funding

The work at Brookhaven National Laboratory and Lawrence Berkeley National Laboratory was supported by the Office of Basic Energy Sciences (BES), Division of Materials Science and Engineering, U.S. Department of Energy (DOE), under Contracts No. DE-SC0012704 and No. DE-AC02-05CH1123, respectively. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The work at Brookhaven National Laboratory and Lawrence Berkeley National Laboratory was supported by the Office of Basic Energy Sciences (BES), Division of Materials Science and Engineering, U.S. Department of Energy (DOE), under Contracts No. DE-SC0012704 and No. DE-AC02-05CH1123, respectively. A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

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10.1103/PhysRevB.97.214511

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Xu, Z., Schneeloch, J. A., Yi, M., Zhao, Y., Matsuda, M., Pajerowski, D. M., Chi, S., Birgeneau, R. J., Gu, G., Tranquada, J. M., & Xu, G. (2018). Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al. Physical Review B, 97(21), Article 214511. https://doi.org/10.1103/PhysRevB.97.214511

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title = "Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al.",

abstract = "In as-grown bulk crystals of Fe1+yTe1-xSex with x≲0.3, excess Fe (y>0) is inevitable and correlates with a suppression of superconductivity. At the same time, there remains the question as to whether the character of the antiferromagnetic correlations associated with the enhanced anion height above the Fe planes in Te-rich samples is compatible with superconductivity. To test this, we have annealed as-grown crystals with x=0.1 and 0.2 in Te vapor, effectively reducing the excess Fe and inducing bulk superconductivity. Inelastic neutron scattering measurements reveal low-energy magnetic excitations consistent with short-range correlations of the double-stripe type; nevertheless, cooling into the superconducting state results in a spin gap and a spin resonance, with the extra signal in the resonance being short range with a mixed single-stripe/double-stripe character, which is different than other iron-based superconductors. The mixed magnetic character of these superconducting samples does not appear to be trivially explainable by inhomogeneity.",

author = "Zhijun Xu and Schneeloch, {J. A.} and Ming Yi and Yang Zhao and Masaaki Matsuda and Pajerowski, {D. M.} and Songxue Chi and Birgeneau, {R. J.} and Genda Gu and Tranquada, {J. M.} and Guangyong Xu",

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year = "2018",

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Xu, Z, Schneeloch, JA, Yi, M, Zhao, Y, Matsuda, M , Pajerowski, DM , Chi, S, Birgeneau, RJ, Gu, G, Tranquada, JM & Xu, G 2018, 'Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al.', Physical Review B, vol. 97, no. 21, 214511. https://doi.org/10.1103/PhysRevB.97.214511

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AU - Xu, Zhijun

AU - Schneeloch, J. A.

AU - Yi, Ming

AU - Zhao, Yang

AU - Matsuda, Masaaki

AU - Pajerowski, D. M.

AU - Chi, Songxue

AU - Birgeneau, R. J.

AU - Gu, Genda

AU - Tranquada, J. M.

AU - Xu, Guangyong

PY - 2018/6/14

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N2 - In as-grown bulk crystals of Fe1+yTe1-xSex with x≲0.3, excess Fe (y>0) is inevitable and correlates with a suppression of superconductivity. At the same time, there remains the question as to whether the character of the antiferromagnetic correlations associated with the enhanced anion height above the Fe planes in Te-rich samples is compatible with superconductivity. To test this, we have annealed as-grown crystals with x=0.1 and 0.2 in Te vapor, effectively reducing the excess Fe and inducing bulk superconductivity. Inelastic neutron scattering measurements reveal low-energy magnetic excitations consistent with short-range correlations of the double-stripe type; nevertheless, cooling into the superconducting state results in a spin gap and a spin resonance, with the extra signal in the resonance being short range with a mixed single-stripe/double-stripe character, which is different than other iron-based superconductors. The mixed magnetic character of these superconducting samples does not appear to be trivially explainable by inhomogeneity.

AB - In as-grown bulk crystals of Fe1+yTe1-xSex with x≲0.3, excess Fe (y>0) is inevitable and correlates with a suppression of superconductivity. At the same time, there remains the question as to whether the character of the antiferromagnetic correlations associated with the enhanced anion height above the Fe planes in Te-rich samples is compatible with superconductivity. To test this, we have annealed as-grown crystals with x=0.1 and 0.2 in Te vapor, effectively reducing the excess Fe and inducing bulk superconductivity. Inelastic neutron scattering measurements reveal low-energy magnetic excitations consistent with short-range correlations of the double-stripe type; nevertheless, cooling into the superconducting state results in a spin gap and a spin resonance, with the extra signal in the resonance being short range with a mixed single-stripe/double-stripe character, which is different than other iron-based superconductors. The mixed magnetic character of these superconducting samples does not appear to be trivially explainable by inhomogeneity.

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Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex (x≤0.2) COEXISTENCE of SUPERCONDUCTIVITY and SHORT- ⋯ ZHIJUN XU et al.

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