Ising pyrochlore magnets: Low-temperature properties, "ice rules," and beyond

Siddharthan, R and Shastry, BS and Ramirez, AP and Hayashi, A and Cava, RJ and Rosenkranz, S (1999) Ising pyrochlore magnets: Low-temperature properties, "ice rules," and beyond. In: Physical Review Letters, 83 (9). pp. 1854-1857.

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Abstract

Pyrochlore magnets are candidates for what Harris et al. [Phys. Rev. Lett. 79, 2554 (1997)] call "spin-ice" behavior. We present theoretical simulations of relevance for the pyrochlore family R2Ti2O7 (R = rare earth) supported by magnetothermal measurements on selected systems. Ey considering long-ranged dipole-dipole as well as short-ranged superexchange interactions, we get three distinct behaviors: (i) an ordered doubly degenerate state, (ii) a highly disordered state with a broad transition to paramagnetism, and (iii) a partially ordered state with a sharp transition to paramagnetism. Closely corresponding behavior is seen in the real compounds.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	23 Jun 2011 07:22
Last Modified:	23 Jun 2011 07:22
URI:	http://eprints.iisc.ac.in/id/eprint/38595

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