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Title: Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe1-xSex

Abstract

It has recently been demonstrated that dynamical magnetic correlations measured by neutron scattering in iron chalcogenides can be described with models of short-range correlations characterized by particular choices of four-spin plaquettes, where the appropriate choice changes as the parent material is doped towards superconductivity. Here we apply such models to describe measured maps of magnetic scattering as a function of two-dimensional wave vectors obtained for optimally superconducting crystals of FeTe1-xSex. We show that the characteristic antiferromagnetic wave vector evolves from that of the bicollinear structure found in underdoped chalcogenides (at high temperature) to that associated with the stripe structure of antiferromagnetic iron arsenides (at low temperature); these can both be described with the same local plaquette, but with different interplaquette correlations. While the magnitude of the low-energy magnetic spectral weight is substantial at all temperatures, it actually weakens somewhat at low temperature, where the charge carriers become more itinerant. The observed change in spin correlations is correlated with the dramatic drop in the electronic scattering rate and the growth of the bulk nematic response upon cooling. Finally, we also present powder neutron diffraction results for lattice parameters in FeTe1-xSex indicating that the tetrahedral bond angle tends to increase towards themore » ideal value upon cooling, in agreement with the increased screening of the crystal field by more itinerant electrons and the correspondingly smaller splitting of the Fe 3d orbitals.« less

Authors:
 [1];  [2];  [3];  [4];  [2];  [5];  [5];  [5];  [1];  [2];  [2];  [2]
  1. 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)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
  4. Nanjing Univ., Nanjing (China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1255723
Alternate Identifier(s):
OSTI ID: 1242565; OSTI ID: 1261393; OSTI ID: 1454458
Report Number(s):
BNL-112204-2016-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PO010; KC0201060
Grant/Contract Number:  
SC0012704; SC00112704; AC02-05CH11231; AC05-00OR22725; AC02- 05CH11231; 11374143; NCET-13-0282
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Xu, Zhijun, Xu, Guangyong, Schneeloch, J. A., Wen, Jinsheng, Bozin, E. S., Granroth, G. E., Winn, B. L., Feygenson, M., Birgeneau, R. J., Gu, Genda, Zaliznyak, I. A., and Tranquada, J. M. Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe1-xSex. United States: N. p., 2016. Web. https://doi.org/10.1103/PhysRevB.93.104517.
Xu, Zhijun, Xu, Guangyong, Schneeloch, J. A., Wen, Jinsheng, Bozin, E. S., Granroth, G. E., Winn, B. L., Feygenson, M., Birgeneau, R. J., Gu, Genda, Zaliznyak, I. A., & Tranquada, J. M. Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe1-xSex. United States. https://doi.org/10.1103/PhysRevB.93.104517
Xu, Zhijun, Xu, Guangyong, Schneeloch, J. A., Wen, Jinsheng, Bozin, E. S., Granroth, G. E., Winn, B. L., Feygenson, M., Birgeneau, R. J., Gu, Genda, Zaliznyak, I. A., and Tranquada, J. M. Mon . "Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe1-xSex". United States. https://doi.org/10.1103/PhysRevB.93.104517. https://www.osti.gov/servlets/purl/1255723.
@article{osti_1255723,
title = {Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe1-xSex},
author = {Xu, Zhijun and Xu, Guangyong and Schneeloch, J. A. and Wen, Jinsheng and Bozin, E. S. and Granroth, G. E. and Winn, B. L. and Feygenson, M. and Birgeneau, R. J. and Gu, Genda and Zaliznyak, I. A. and Tranquada, J. M.},
abstractNote = {It has recently been demonstrated that dynamical magnetic correlations measured by neutron scattering in iron chalcogenides can be described with models of short-range correlations characterized by particular choices of four-spin plaquettes, where the appropriate choice changes as the parent material is doped towards superconductivity. Here we apply such models to describe measured maps of magnetic scattering as a function of two-dimensional wave vectors obtained for optimally superconducting crystals of FeTe1-xSex. We show that the characteristic antiferromagnetic wave vector evolves from that of the bicollinear structure found in underdoped chalcogenides (at high temperature) to that associated with the stripe structure of antiferromagnetic iron arsenides (at low temperature); these can both be described with the same local plaquette, but with different interplaquette correlations. While the magnitude of the low-energy magnetic spectral weight is substantial at all temperatures, it actually weakens somewhat at low temperature, where the charge carriers become more itinerant. The observed change in spin correlations is correlated with the dramatic drop in the electronic scattering rate and the growth of the bulk nematic response upon cooling. Finally, we also present powder neutron diffraction results for lattice parameters in FeTe1-xSex indicating that the tetrahedral bond angle tends to increase towards the ideal value upon cooling, in agreement with the increased screening of the crystal field by more itinerant electrons and the correspondingly smaller splitting of the Fe 3d orbitals.},
doi = {10.1103/PhysRevB.93.104517},
journal = {Physical Review B},
number = 10,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

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    Works referencing / citing this record:

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