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

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

doi:10.1103/PhysRevLett.114.057001

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

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

Physics and Astronomy (Twin Cities)

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Abstract

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 spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings 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 long-range stripe antiferromagnetic order in iron pnictides.

Original language	English (US)
Article number	057001
Journal	Physical review letters
Volume	114
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.114.057001
State	Published - Feb 4 2015

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© 2015 American Physical Society.

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Zhang, Q., Fernandes, R. M., Lamsal, J., Yan, J., Chi, S., Tucker, G. S., Pratt, D. K., Lynn, J. W., McCallum, R. W., Canfield, P. C., Lograsso, T. A., Goldman, A. I., Vaknin, D., & McQueeney, R. J. (2015). 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. Physical review letters, 114(5), Article 057001. https://doi.org/10.1103/PhysRevLett.114.057001

Zhang, Q, Fernandes, RM, Lamsal, J, Yan, J, Chi, S, Tucker, GS, Pratt, DK, Lynn, JW, McCallum, RW, Canfield, PC, Lograsso, TA, Goldman, AI, Vaknin, D & McQueeney, RJ 2015, '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', Physical review letters, vol. 114, no. 5, 057001. https://doi.org/10.1103/PhysRevLett.114.057001

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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",

abstract = "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 spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings 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 long-range stripe antiferromagnetic order in iron pnictides.",

author = "Qiang Zhang and Fernandes, {Rafael M.} and Jagat Lamsal and Jiaqiang Yan and Songxue Chi 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 David Vaknin and McQueeney, {Robert J.}",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = feb,

day = "4",

doi = "10.1103/PhysRevLett.114.057001",

language = "English (US)",

volume = "114",

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T2 - Evidence for a sharp enhancement of spin fluctuations by nematic order

AU - Zhang, Qiang

AU - Fernandes, Rafael M.

AU - Lamsal, Jagat

AU - Yan, Jiaqiang

AU - Chi, Songxue

AU - Tucker, Gregory S.

AU - Pratt, Daniel K.

AU - Lynn, Jeffrey W.

AU - McCallum, R. W.

AU - Canfield, Paul C.

AU - Lograsso, Thomas A.

AU - Goldman, Alan I.

AU - Vaknin, David

AU - McQueeney, Robert J.

PY - 2015/2/4

Y1 - 2015/2/4

N2 - 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 spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings 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 long-range stripe antiferromagnetic order in iron pnictides.

AB - 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 spin-spin correlation length, revealing a strong feedback effect of nematic order on the low-energy magnetic spectrum. Our findings 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 long-range stripe antiferromagnetic order in iron pnictides.

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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

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