Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity

M. G. Kim; M. Wang; G. S. Tucker; P. N. Valdivia; D. L. Abernathy; Songxue Chi; A. D. Christianson; A. A. Aczel; T. Hong; T. W. Heitmann; S. Ran; P. C. Canfield; E. D. Bourret-Courchesne; A. Kreyssig; D. H. Lee; A. I. Goldman; R. J. McQueeney; R. J. Birgeneau

doi:10.1103/PhysRevB.92.214404

Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity

M. G. Kim, M. Wang, G. S. Tucker, P. N. Valdivia, D. L. Abernathy, Songxue Chi, A. D. Christianson, A. A. Aczel, T. Hong, T. W. Heitmann, S. Ran, P. C. Canfield, E. D. Bourret-Courchesne, A. Kreyssig, D. H. Lee, A. I. Goldman, R. J. McQueeney, R. J. Birgeneau

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe0.957Cu0.043)2As2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe2As2 and superconducting Ba(Fe1-xNix)2As2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe0.957Cu0.043)2As2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. We also show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.

Original language	English
Article number	214404
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	92
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevB.92.214404
State	Published - Dec 2 2015

Access to Document

10.1103/PhysRevB.92.214404

Cite this

Kim, M. G., Wang, M., Tucker, G. S., Valdivia, P. N., Abernathy, D. L., Chi, S., Christianson, A. D., Aczel, A. A., Hong, T., Heitmann, T. W., Ran, S., Canfield, P. C., Bourret-Courchesne, E. D., Kreyssig, A., Lee, D. H., Goldman, A. I., McQueeney, R. J., & Birgeneau, R. J. (2015). Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity. Physical Review B - Condensed Matter and Materials Physics, 92(21), Article 214404. https://doi.org/10.1103/PhysRevB.92.214404

@article{51b9f6433e954547afb0c6617402cded,

title = "Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity",

abstract = "We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe0.957Cu0.043)2As2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe2As2 and superconducting Ba(Fe1-xNix)2As2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe0.957Cu0.043)2As2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. We also show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.",

author = "Kim, {M. G.} and M. Wang and Tucker, {G. S.} and Valdivia, {P. N.} and Abernathy, {D. L.} and Songxue Chi and Christianson, {A. D.} and Aczel, {A. A.} and T. Hong and Heitmann, {T. W.} and S. Ran and Canfield, {P. C.} and Bourret-Courchesne, {E. D.} and A. Kreyssig and Lee, {D. H.} and Goldman, {A. I.} and McQueeney, {R. J.} and Birgeneau, {R. J.}",

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

year = "2015",

month = dec,

day = "2",

doi = "10.1103/PhysRevB.92.214404",

language = "English",

volume = "92",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "21",

}

Kim, MG, Wang, M, Tucker, GS, Valdivia, PN, Abernathy, DL , Chi, S , Christianson, AD , Aczel, AA , Hong, T, Heitmann, TW, Ran, S, Canfield, PC, Bourret-Courchesne, ED, Kreyssig, A, Lee, DH, Goldman, AI, McQueeney, RJ & Birgeneau, RJ 2015, 'Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity', Physical Review B - Condensed Matter and Materials Physics, vol. 92, no. 21, 214404. https://doi.org/10.1103/PhysRevB.92.214404

TY - JOUR

T1 - Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity

AU - Kim, M. G.

AU - Wang, M.

AU - Tucker, G. S.

AU - Valdivia, P. N.

AU - Abernathy, D. L.

AU - Chi, Songxue

AU - Christianson, A. D.

AU - Aczel, A. A.

AU - Hong, T.

AU - Heitmann, T. W.

AU - Ran, S.

AU - Canfield, P. C.

AU - Bourret-Courchesne, E. D.

AU - Kreyssig, A.

AU - Lee, D. H.

AU - Goldman, A. I.

AU - McQueeney, R. J.

AU - Birgeneau, R. J.

PY - 2015/12/2

Y1 - 2015/12/2

N2 - We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe0.957Cu0.043)2As2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe2As2 and superconducting Ba(Fe1-xNix)2As2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe0.957Cu0.043)2As2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. We also show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.

AB - We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe0.957Cu0.043)2As2, a composition close to a quantum critical point between antiferromagnetic (AFM) ordered and paramagnetic phases. By comparing these results with the spin fluctuations in the low-Cu composition as well as the parent compound BaFe2As2 and superconducting Ba(Fe1-xNix)2As2 compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe0.957Cu0.043)2As2, which is distinct from the AFM-like spin fluctuations in the superconducting compounds. Our observations suggest that Cu substitution decouples the interaction between quasiparticles and the spin fluctuations. We also show that the spin-spin correlation length ξ(T) increases rapidly as the temperature is lowered and find ω/T scaling behavior, the hallmark of quantum criticality, at an antiferromagnetic quantum critical point.

UR - http://www.scopus.com/inward/record.url?scp=84951114093&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.92.214404

DO - 10.1103/PhysRevB.92.214404

M3 - Article

AN - SCOPUS:84951114093

SN - 1098-0121

VL - 92

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 21

M1 - 214404

ER -

Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted BaFe2As2 and its relation to high-temperature superconductivity

Abstract

Access to Document

Other files and links

Fingerprint

Cite this