Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]
Abstract
Here, inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spinspin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our results can be consistently described by a model that attributes the structural or nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the longrange stripe antiferromagnetic order in iron pnictides.
- Authors:
-
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
- Univ. of Minnesota, Minneapolis, MN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- National Institute of Standards and Technology, Gaithersburg, MD (United States)
- Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States); Oak Ridge National Lab., Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1227151
- Alternate Identifier(s):
- OSTI ID: 1181338; OSTI ID: 1265340
- Report Number(s):
- IS-J-8611
Journal ID: ISSN 0031-9007; PRLTAO
- Grant/Contract Number:
- AC02-07CH11358; SC0012336; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 114; Journal Issue: 5; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Zhang, Qiang, Fernandes, Rafael M., Lamsal, Jagat, Yan, Jiaqiang, Chi, Songxue, Tucker, Gregory S., Pratt, Daniel K., Lynn, Jeffrey W., McCallum, R. W., Canfield, Paul C., Lograsso, Thomas A., Goldman, Alan I., Vaknin, David, and McQueeney, Robert J. Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]. United States: N. p., 2015.
Web. doi:10.1103/PhysRevLett.114.057001.
Zhang, Qiang, Fernandes, Rafael M., Lamsal, Jagat, Yan, Jiaqiang, Chi, Songxue, Tucker, Gregory S., Pratt, Daniel K., Lynn, Jeffrey W., McCallum, R. W., Canfield, Paul C., Lograsso, Thomas A., Goldman, Alan I., Vaknin, David, & McQueeney, Robert J. Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]. United States. https://doi.org/10.1103/PhysRevLett.114.057001
Zhang, Qiang, Fernandes, Rafael M., Lamsal, Jagat, Yan, Jiaqiang, Chi, Songxue, Tucker, Gregory S., Pratt, Daniel K., Lynn, Jeffrey W., McCallum, R. W., Canfield, Paul C., Lograsso, Thomas A., Goldman, Alan I., Vaknin, David, and McQueeney, Robert J. Wed .
"Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]". United States. https://doi.org/10.1103/PhysRevLett.114.057001. https://www.osti.gov/servlets/purl/1227151.
@article{osti_1227151,
title = {Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe0.953Co0.047)2As2: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]},
author = {Zhang, Qiang and Fernandes, Rafael M. and Lamsal, Jagat and Yan, Jiaqiang and Chi, Songxue and Tucker, Gregory S. and Pratt, Daniel K. and Lynn, Jeffrey W. and McCallum, R. W. and Canfield, Paul C. and Lograsso, Thomas A. and Goldman, Alan I. and Vaknin, David and McQueeney, Robert J.},
abstractNote = {Here, inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe0.953Co0.047)2As2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at TS, sets in well above the stripe antiferromagnetic ordering at TN. We find that the temperature-dependent dynamic susceptibility displays an anomaly at TS followed by a sharp enhancement in the spinspin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our results can be consistently described by a model that attributes the structural or nematic transition to magnetic fluctuations, and unveils the key role played by nematic order in promoting the longrange stripe antiferromagnetic order in iron pnictides.},
doi = {10.1103/PhysRevLett.114.057001},
journal = {Physical Review Letters},
number = 5,
volume = 114,
place = {United States},
year = {Wed Feb 04 00:00:00 EST 2015},
month = {Wed Feb 04 00:00:00 EST 2015}
}
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