Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex ( x≤0.2 )

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

doi:10.1103/PhysRevB.97.214511

Title: Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed ${FeTe}_{1 - x} {Se}_{x}$ ( $x \leq 0.2$ )

Journal Article · 13 June 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.214511 · OSTI ID:1440360

Xu, Zhijun ^[1]; Schneeloch, J. A. ^[2]; Yi, Ming ^[3]; Zhao, Yang ^[4]; Matsuda, Masaaki ^[5]; Pajerowski, D. M. ^[5]; Chi, Songxue ^[5]; Birgeneau, R. J. ^[3]; Gu, Genda ^[6]; Tranquada, J. M. ^[6]; Xu, Guangyong ^[7]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

In as-grown bulk crystals of Fe_1+yTe_1–xSe_x with x ≲ 0.3, excess Fe (y > 0) is inevitable and correlates with a suppression of superconductivity. At the same time, t here remains the question as to whether the character of the antiferromagnetic correlations associated wi th the enhanced anion height above the Fe planes in Te-rich samples is compatible with superconductivity. To t est this, we have annealed as-grown crystals with x = 0.1 and 0.2 in Te vapor, effectively reducing the excess Fe and in ducing bulk superconductivity. Inelastic neutron scattering measurements reveal low-energy magnet ic excitations consistent with short-range correlations of the double-stripe type; nevertheless, cooling int o 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. In conclusion, the mixed magnetic character of these superconducting samples does not appear to be trivially explainable by inhomogeneity.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; SC0012704

OSTI ID:: 1440360

Report Number(s):: BNL--205734-2018-JAAM

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 21 Vol. 97; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe 1 - x Se x ( x ≤ 0.2 )

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Title: Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed ${FeTe}_{1 - x} {Se}_{x}$ ( $x \leq 0.2$ )