Coexistence of glassiness and canted antiferromagnetism in triangular quantum Heisenberg antiferromagnets with weak Dzyaloshinskii-Moriya interaction
- Department of Physics, The Ohio State University, Columbus, Ohio43210-1106 (United States)
- Department of Basic Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo153 (Japan)
- Department of Physics, The Ohio State University, Columbus, Ohio43210-1106
We present magnetic studies of three triangular quantum Heisenberg antiferromagnets (TQHAF{close_quote}s) with weak additional Dzyaloshinskii-Moriya interaction, Cu{sub 2}(OH){sub 3}(C{sub m}H{sub 2m+1}COO), m=7, 9, and 11. Fits of the dc susceptibility data to high-temperature series expansions agree with high-temperature TQHAF behavior. At low temperatures the deviations from the TQHAF predictions suggest a canted antiferromagnetic type of ordering, while the strong peak in the second harmonic of the nonlinear ac susceptibility indicates the development of a spontaneous moment. The frequency dependence of the linear ac susceptibility and the irreversibility in the field-cooled/zero-field-cooled magnetization show that frustration is strong enough to cause glassiness. We propose that the interplay of Heisenberg and Dzyaloshinskii-Moriya exchanges leads to the unusual coexistence of glassiness and canted antiferromagnetism in these geometrically frustrated systems. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 627919
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 18; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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