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Title: Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba 0.67 K 0.33 ( Fe 1 x Co x ) 2 As 2

Abstract

Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba 0.67K 0.33(Fe 1–xCo x) 2As 2 (x=0 and 0.08 with T c ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe 0.963Ni 0.037) 2As 2 (T N = 26 K and T c = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector Q AF along the longitudinal direction, but disperses upwards away from Q AF along the transverse direction. For hole-doped x = 0 and 0.08 without AF order, we find that the resonance displays a ringlike upward dispersion away from Q AF along both the longitudinal and transverse directions. By comparing these results with calculations using the random phase approximation, we conclude that the dispersive resonance is a direct signature of isotropic superconducting gaps arising from nested hole-electron Fermi surfaces.

Authors:
 [1];  [1]; ORCiD logo [2];  [3]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Sun Yat-Sen Univ., Guangzhou (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1468036
Alternate Identifier(s):
OSTI ID: 1467958
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., and Dai, Pengcheng. Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.98.060502.
Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., & Dai, Pengcheng. Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2. United States. doi:10.1103/PhysRevB.98.060502.
Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., and Dai, Pengcheng. Thu . "Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2". United States. doi:10.1103/PhysRevB.98.060502. https://www.osti.gov/servlets/purl/1468036.
@article{osti_1468036,
title = {Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2},
author = {Zhang, Rui N. and Wang, Weiyi and Maier, Thomas A. and Wang, Meng and Stone, Matthew B. and Chi, Songxue and Winn, Barry L. and Dai, Pengcheng},
abstractNote = {Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba0.67K0.33(Fe1–xCox)2As2 (x=0 and 0.08 with Tc ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe0.963Ni0.037)2As2 (TN = 26 K and Tc = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector QAF along the longitudinal direction, but disperses upwards away from QAF along the transverse direction. For hole-doped x = 0 and 0.08 without AF order, we find that the resonance displays a ringlike upward dispersion away from QAF along both the longitudinal and transverse directions. By comparing these results with calculations using the random phase approximation, we conclude that the dispersive resonance is a direct signature of isotropic superconducting gaps arising from nested hole-electron Fermi surfaces.},
doi = {10.1103/PhysRevB.98.060502},
journal = {Physical Review B},
number = 6,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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