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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 )

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [3] ;  [6] ;  [6] ;  [7]
  1. 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)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  3. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Brookhaven National Lab. (BNL), Upton, NY (United States)
  7. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
BNL-205734-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC05-00OR22725; SC0012704; AC02-05CH1123; AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
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
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; superconductivity; inelastic neutron scattering
OSTI Identifier:
1440360
Alternate Identifier(s):
OSTI ID: 1454307; OSTI ID: 1460176; OSTI ID: 1466717

Xu, Zhijun, Schneeloch, J. A., Yi, Ming, Zhao, Yang, Matsuda, Masaaki, Pajerowski, D. M., Chi, Songxue, Birgeneau, R. J., Gu, Genda, Tranquada, J. M., and Xu, Guangyong. Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex ( x≤0.2 ). United States: N. p., Web. doi:10.1103/PhysRevB.97.214511.
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. Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex ( x≤0.2 ). United States. doi:10.1103/PhysRevB.97.214511.
Xu, Zhijun, Schneeloch, J. A., Yi, Ming, Zhao, Yang, Matsuda, Masaaki, Pajerowski, D. M., Chi, Songxue, Birgeneau, R. J., Gu, Genda, Tranquada, J. M., and Xu, Guangyong. 2018. "Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex ( x≤0.2 )". United States. doi:10.1103/PhysRevB.97.214511.
@article{osti_1440360,
title = {Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed FeTe1-xSex ( x≤0.2 )},
author = {Xu, Zhijun and Schneeloch, J. A. and Yi, Ming and Zhao, Yang and Matsuda, Masaaki and Pajerowski, D. M. and Chi, Songxue and Birgeneau, R. J. and Gu, Genda and Tranquada, J. M. and Xu, Guangyong},
abstractNote = {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, 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.},
doi = {10.1103/PhysRevB.97.214511},
journal = {Physical Review B},
number = 21,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}