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 · Thu Jun 14 00:00:00 EDT 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, 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC05-00OR22725; SC0012704; AC02-05CH1123; AC02-05CH11231

OSTI ID:: 1440360

Alternate ID(s):: OSTI ID: 1454307; OSTI ID: 1460176; OSTI ID: 1466717

Report Number(s):: BNL-205734-2018-JAAM; PRBMDO; TRN: US1900728

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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