Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2 O4

Hun Chang, In Yong Hwang, Jaiho Chung, J. Ross Stewart, Wataru Higemoto, Yasuhiro Miyake

Research output: Contribution to journalArticle

Abstract

We report the temperature-dependent evolution of spin ordering and excitations of the frustrated tetragonal (c>a) spinel ZnMn2O4 across the two-dimensional antiferromagnetic transition. Muon spin relaxation indicates full development of ordered magnetic moments immediately below TN=62.7(2)K in spite of the apparent low-dimensional ordering. Using inelastic neutron scattering, we obtained the spin Hamiltonian accounting for the temperature-dependent spin excitations. The damped spin waves at high temperature exhibit a continuous increase in their lifetime on cooling across TN. In contrast, the finite anisotropy gap appears suddenly below TN indicating that single-ion anisotropy stabilizes the antiferromagnetic chains. We also observed the frustrated out-of-plane exchange contributing to the high-energy modes.

Original languageEnglish
Article number014406
JournalPhysical Review B
Volume97
Issue number1
DOIs
Publication statusPublished - 2018 Jan 3

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spinel
temperature dependence
Anisotropy
excitation
Hamiltonians
Inelastic neutron scattering
Spin waves
Magnetic moments
Temperature
anisotropy
Ions
magnons
Cooling
muons
inelastic scattering
neutron scattering
magnetic moments
cooling
life (durability)
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2 O4. / Chang, Hun; Hwang, In Yong; Chung, Jaiho; Stewart, J. Ross; Higemoto, Wataru; Miyake, Yasuhiro.

In: Physical Review B, Vol. 97, No. 1, 014406, 03.01.2018.

Research output: Contribution to journalArticle

Chang, Hun ; Hwang, In Yong ; Chung, Jaiho ; Stewart, J. Ross ; Higemoto, Wataru ; Miyake, Yasuhiro. / Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2 O4. In: Physical Review B. 2018 ; Vol. 97, No. 1.
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