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

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

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

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

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program (NRF-2016R1D1A1B03934157) and the International Cooperation in S&T Program (NRF-2017K1A3A7A09016303) through the National Research Foundation of Korea (NRF).

Publisher Copyright:
© 2018 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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