Molecular Spin Excitations in the Orbitally Frustrated Spinel GeCo2Od4^

Published

August 2, 2011

Author(s)

K. Tomiyasu, Michael K. Crawford, D.T. Adroja, P. Manuel, A. Tominaga, S. Hara, H. Sato, T. Watanabe, S. I. Ikeda, Jeffrey W. Lynn, K. Iwasa, K Yamada

Abstract

We describe powder and single-crystal inelastic neutron scattering experiments on a spinel-type antiferromagnet GeCo₂O₄ with orbital degrees of freedom, which is a candidate for a geometrically orbitally frustrated system. Several types of short-range spin excitations were discovered. The scattering intensity maps in Q space are well reproduced by several spin molecule models. These features are similar to those in a spin frustrated system. However, ferromagnetic correlations are dominant in the low-energy spin fluctuations above and below T_N, suggesting that degrees of freedom other than spin are frustrated. Orbital frustration is the likely origin, suggesting that we have observed orbital frustration through scattering from spin.

Citation

Physical Review B

Volume

84

Issue

5

Pub Type

Journals

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Keywords

Frustrated Magnet, spin excitations, Spinel, Phase Transition

Citation

Tomiyasu, K. , Crawford, M. , Adroja, D. , Manuel, P. , Tominaga, A. , Hara, S. , Sato, H. , Watanabe, T. , Ikeda, S. , Lynn, J. , Iwasa, K. and Yamada, K. (2011), Molecular Spin Excitations in the Orbitally Frustrated Spinel GeCo_2Od4^, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=905696 (Accessed April 16, 2024)