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

Kim, M. G.; Wang, M.; Tucker, G. S.; Valdivia, P. N.; Abernathy, D. L.; Chi, Songxue; 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.

doi:10.1103/PhysRevB.92.214404

Spin dynamics near a putative antiferromagnetic quantum critical point in Cu-substituted ${BaFe}_{2} {As}_{2}$ and its relation to high-temperature superconductivity

Journal Article · Wed Dec 02 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.214404· OSTI ID:1234514

Kim, M. G. ^[1]; Wang, M. ^[2]; Tucker, G. S. ^[3]; Valdivia, P. N. ^[4]; Abernathy, D. L. ^[5]; Chi, Songxue ^[5]; Christianson, A. D. ^[5]; Aczel, A. A. ^[5]; Hong, T. ^[5]; Heitmann, T. W. ^[6]; Ran, S. ^[3]; Canfield, P. C. ^[3]; Bourret-Courchesne, E. D. ^[1]; Kreyssig, A. ^[3]; Lee, D. H. ^[7]; Goldman, A. I. ^[3]; McQueeney, R. J. ^[3]; Birgeneau, R. J. ^[8]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Univ. of California, Berkeley, CA (United States). Dept. of Physics
Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Ames Lab., Ames, IA (United States)
Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. of Missouri, Columbia, MO (United States). The Missouri Research Reactor
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Physics and Dept. of Materials Science and Engineering

We present the results of elastic and inelastic neutron scattering measurements on nonsuperconducting Ba(Fe_0.957Cu_0.043)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(Fe_1–xNi_x)₂As₂ compounds, we demonstrate that paramagnon-like spin fluctuations are evident in the antiferromagnetically ordered state of Ba(Fe_0.957Cu_0.043)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. In addition, we 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.

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC02-07CH11358; AC05-00OR22725

OSTI ID:: 1234514

Alternate ID(s):: OSTI ID: 1311256
OSTI ID: 1227748
OSTI ID: 1454443

Report Number(s):: IS-J--8817

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 21 Vol. 92; ISSN 1098-0121; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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