Spin waves above and below the Verwey transition in TbBaFe2O5

Pajerowski, Daniel M.; Pratt, Daniel K.; Hahn, Steven; Tian, Wei; Granroth, Garrett; Kolesnikov, Alexander I.; Taskin, A; Ando, Yoichi; Mcqueeney, Robert

doi:10.1103/PhysRevB.101.064418

Title: Spin waves above and below the Verwey transition in ${TbBaFe}_{2} O_{5}$

Abstract

TbBaFe₂O_5+δ (TBFO) is a mixed valence compound with an antiferromagnetic order (T_N=450K) that changes along with the crystal structure and conductivity upon cooling below a Verwey-like transition (TV=280K). This type of double-cell-layered perovskite is useful to study putative charge ordering in fractional valence systems because the crystal structure develops unique sites for the different valence states. While the evolution of the static magnetic structure in the different charge ordered states of TBFO is known, in this study we investigate the effect of charge ordering on the magnetic interactions. Dispersive magnetic excitations measured using single crystal inelastic neutron scattering experiments at T=4K_V and T=320K>T_V are modeled with linear-spin-wave theory to extract anisotropy and superexchange parameters. Below T_V, we observe a sizable magnon gap due to an easy-axis magnetic anisotropy that closes above T_V due to the evolution of easy-plane anisotropy. The magnetic interactions are found to be highly three-dimensional and change across T_V. Above T_V, where the conductivity is greater, a damping term is required to model the spin waves that suggests a coupling to valence fluctuations.

Authors:

^[1]; Pratt, Daniel K. ^[2];

^[1];

^[3]; Ando, Yoichi ^[3]; Mcqueeney, Robert ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Univ. of Cologne (Germany)
Ames Lab., and Iowa State Univ., Ames, IA (United States)

Publication Date:: Tue Feb 18 00:00:00 EST 2020

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1606774

Alternate Identifier(s):: OSTI ID: 1600077

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 101; Journal Issue: 6; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Charge order; Spin dynamics; Strongly correlated systems; Transition-metal oxides; Neutron scattering

Citation Formats


                    Pajerowski, Daniel M., Pratt, Daniel K., Hahn, Steven, Tian, Wei, Granroth, Garrett, Kolesnikov, Alexander I., Taskin, A, Ando, Yoichi, and Mcqueeney, Robert. Spin waves above and below the Verwey transition in TbBaFe2O5.  United States: N. p., 2020. 
Web.  doi:10.1103/PhysRevB.101.064418.

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                    Pajerowski, Daniel M., Pratt, Daniel K., Hahn, Steven, Tian, Wei, Granroth, Garrett, Kolesnikov, Alexander I., Taskin, A, Ando, Yoichi, & Mcqueeney, Robert. Spin waves above and below the Verwey transition in TbBaFe2O5.  United States.  https://doi.org/10.1103/PhysRevB.101.064418

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                    Pajerowski, Daniel M., Pratt, Daniel K., Hahn, Steven, Tian, Wei, Granroth, Garrett, Kolesnikov, Alexander I., Taskin, A, Ando, Yoichi, and Mcqueeney, Robert. Tue .  
"Spin waves above and below the Verwey transition in TbBaFe2O5".  United States.  https://doi.org/10.1103/PhysRevB.101.064418.  https://www.osti.gov/servlets/purl/1606774.

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@article{osti_1606774,

  title        = {Spin waves above and below the Verwey transition in TbBaFe2O5},

  author       = {Pajerowski, Daniel M. and Pratt, Daniel K. and Hahn, Steven and Tian, Wei and Granroth, Garrett and Kolesnikov, Alexander I. and Taskin, A and Ando, Yoichi and Mcqueeney, Robert},

  abstractNote = {TbBaFe2O5+δ (TBFO) is a mixed valence compound with an antiferromagnetic order (TN=450K) that changes along with the crystal structure and conductivity upon cooling below a Verwey-like transition (TV=280K). This type of double-cell-layered perovskite is useful to study putative charge ordering in fractional valence systems because the crystal structure develops unique sites for the different valence states. While the evolution of the static magnetic structure in the different charge ordered states of TBFO is known, in this study we investigate the effect of charge ordering on the magnetic interactions. Dispersive magnetic excitations measured using single crystal inelastic neutron scattering experiments at T=4KV and T=320K>TV are modeled with linear-spin-wave theory to extract anisotropy and superexchange parameters. Below TV, we observe a sizable magnon gap due to an easy-axis magnetic anisotropy that closes above TV due to the evolution of easy-plane anisotropy. The magnetic interactions are found to be highly three-dimensional and change across TV. Above TV, where the conductivity is greater, a damping term is required to model the spin waves that suggests a coupling to valence fluctuations.},

  doi          = {10.1103/PhysRevB.101.064418},

  journal      = {Physical Review B},

  number       = 6,

  volume       = 101,

  place        = {United States},

  year         = {Tue Feb 18 00:00:00 EST 2020},

  month        = {Tue Feb 18 00:00:00 EST 2020}

}

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Title: Spin waves above and below the Verwey transition in TbBaFe 2 O 5

Abstract

Citation Formats

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Title: Spin waves above and below the Verwey transition in ${TbBaFe}_{2} O_{5}$

SciPy 1.0: fundamental algorithms for scientific computing in Python
journal, February 2020

Orbital occupancy evolution across spin- and charge-ordering transitions in YBaFe 2 O 5
journal, August 2017

The Verwey transition - a topical review
journal, March 2002

Mantid—Data analysis and visualization package for neutron scattering and $μ$ SR experiments
journal, November 2014

Checkerboard to stripe charge ordering transition in TbBaFe $_{2}$ O $_{5}$
journal, January 2013

Spin Wave Theory of Double Exchange Ferromagnets
journal, April 2000

Density functional calculations on the charge-ordered and valence-mixed modification of ${YBaFe}_{2} O_{5}$
journal, March 2009

Interplay between spin, charge and orbital degrees of freedom in magnetic oxides
journal, April 1997

SEQUOIA: A Newly Operating Chopper Spectrometer at the SNS
journal, November 2010

Spin rotation technique for non-collinear magnetic systems: application to the generalized Villain model
journal, April 2009

Damping of Antiferromagnetic Spin Waves by Valence Fluctuations in the Double Layer Perovskite ${YBaFe}_{2} O_{5}$
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