Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4

K. Tomiyasu, T. Yokobori, Y. Kousaka, R. I. Bewley, T. Guidi, T. Watanabe, Jun Akimitsu, K. Yamada

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

High degeneracy in ground states leads to the generation of exotic zero-energy modes, a representative example of which is the formation of molecular spin-liquid-like fluctuations in a frustrated magnet. Here we present single-crystal inelastic neutron scattering results for the frustrated magnet MgCr2O4, which show that a common set of finite-energy molecular spin excitation modes is sustained in both the liquid-like phase above magnetic ordering temperature TN and an ordered phase with an extremely complex magnetic structure below TN. Based on this finding, we propose the concept of high degeneracy in excited states, which promotes local resonant elementary excitations. This concept is expected to have ramifications on our understanding of excitations in many complex systems, including not only spin but also atomic liquids, complex order systems, and amorphous systems.

Original languageEnglish
Article number077205
JournalPhysical Review Letters
Volume110
Issue number7
DOIs
Publication statusPublished - Feb 15 2013
Externally publishedYes

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magnets
excitation
elementary excitations
liquids
complex systems
liquid phases
inelastic scattering
neutron scattering
ground state
energy
single crystals
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Tomiyasu, K., Yokobori, T., Kousaka, Y., Bewley, R. I., Guidi, T., Watanabe, T., ... Yamada, K. (2013). Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4 . Physical Review Letters, 110(7), [077205]. https://doi.org/10.1103/PhysRevLett.110.077205

Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4 . / Tomiyasu, K.; Yokobori, T.; Kousaka, Y.; Bewley, R. I.; Guidi, T.; Watanabe, T.; Akimitsu, Jun; Yamada, K.

In: Physical Review Letters, Vol. 110, No. 7, 077205, 15.02.2013.

Research output: Contribution to journalArticle

Tomiyasu, K, Yokobori, T, Kousaka, Y, Bewley, RI, Guidi, T, Watanabe, T, Akimitsu, J & Yamada, K 2013, 'Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4 ', Physical Review Letters, vol. 110, no. 7, 077205. https://doi.org/10.1103/PhysRevLett.110.077205
Tomiyasu K, Yokobori T, Kousaka Y, Bewley RI, Guidi T, Watanabe T et al. Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4 . Physical Review Letters. 2013 Feb 15;110(7). 077205. https://doi.org/10.1103/PhysRevLett.110.077205
Tomiyasu, K. ; Yokobori, T. ; Kousaka, Y. ; Bewley, R. I. ; Guidi, T. ; Watanabe, T. ; Akimitsu, Jun ; Yamada, K. / Emergence of highly degenerate excited states in the frustrated magnet MgCr2O4 . In: Physical Review Letters. 2013 ; Vol. 110, No. 7.
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