Abstract

Pyrochlore magnets are candidates for spin-ice behavior. We present\ntheoretical simulations of relevance for the pyrochlore family R2Ti2O7 (R= rare\nearth) supported by magnetothermal measurements on selected systems. By\nconsidering long ranged dipole-dipole as well as short-ranged superexchange\ninteractions we get three distinct behaviours: (i) an ordered doubly degenerate\nstate, (ii) a highly disordered state with a broad transition to paramagnetism,\n(iii) a partially ordered state with a sharp transition to paramagnetism. Thus\nthese competing interactions can induce behaviour very different from\nconventional ``spin ice''. Closely corresponding behaviour is seen in the real\ncompounds---in particular Ho2Ti2O7 corresponds to case (iii) which has not been\ndiscussed before, rather than (ii) as suggested earlier.\n

Keywords

PyrochloreIsing modelCondensed matter physicsSpin iceMagnetMaterials sciencePhysicsQuantum mechanics

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Publication Info

Year
1999
Type
article
Volume
83
Issue
9
Pages
1854-1857
Citations
242
Access
Closed

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Rahul Siddharthan, B. Sriram Shastry, A. P. Ramirez et al. (1999). Ising Pyrochlore Magnets: Low-Temperature Properties, “Ice Rules,” and Beyond. Physical Review Letters , 83 (9) , 1854-1857. https://doi.org/10.1103/physrevlett.83.1854

Identifiers

DOI
10.1103/physrevlett.83.1854