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]

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.

doi:10.1103/PhysRevLett.114.057001

Title: Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe_0.953Co_0.047)2As₂: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]

Journal Article · Wed Feb 04 00:00:00 EST 2015 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.114.057001· OSTI ID:1227151

Zhang, Qiang ^[1]; Fernandes, Rafael M. ^[2]; Lamsal, Jagat ^[1]; Yan, Jiaqiang ^[3]; Chi, Songxue ^[3]; Tucker, Gregory S. ^[1]; Pratt, Daniel K. ^[4]; Lynn, Jeffrey W. ^[4]; McCallum, R. W. ^[1]; Canfield, Paul C. ^[1]; Lograsso, Thomas A. ^[1]; Goldman, Alan I. ^[1]; Vaknin, David ^[1]; McQueeney, Robert J. ^[5]

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)

Here, inelastic neutron scattering is employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe_0.953Co_0.047)₂As₂. These materials are ideal to study the paramagnetic-nematic state, since the nematic order, signaled by the tetragonal-to-orthorhombic transition at T_S, sets in well above the stripe antiferromagnetic ordering at T_N. We find that the temperature-dependent dynamic susceptibility displays an anomaly at T_S 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.

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Research Organization:: Ames Lab., Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-07CH11358; SC0012336; AC05-00OR22725

OSTI ID:: 1227151

Alternate ID(s):: OSTI ID: 1181338; OSTI ID: 1265340

Report Number(s):: IS-J-8611; PRLTAO

Journal Information:: Physical Review Letters, Vol. 114, Issue 5; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 28 works

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Title: Neutron-scattering measurements of spin excitations in LaFeAsO and Ba(Fe_0.953Co_0.047)2As₂: Evidence for a sharp enhancement of spin fluctuations by nematic order [Sharp enhancement of spin fluctuations by nematic order in iron pnictides]