Ising Pyrochlore Magnets: Low-Temperature Properties, [open quotes]Ice Rules,[close quotes] and Beyond

Journal Article · Sun Aug 01 04:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.83.1854· OSTI ID:6294649

Siddharthan, R; Shastry, B S ^[1]; Ramirez, A P ^[2]; Hayashi, A; Cava, R J ^[3]; Rosenkranz, S ^[4]

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1. Department of Physics, Indian Institute of Science, Bangalore 560012 (India)
2. Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974 (United States)
3. Chemistry Department, Princeton University, Princeton, New Jersey 08540 (United States)
4. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60436 (United States)

Pyrochlore magnets are candidates for what Harris [ital et al. ]thinspthinsp[Phys.thinspthinspRev.thinspthinspLett.thinspthinsp[bold 79], 2554 (1997)] call [open quotes]spin-ice[close quotes] behavior. We present theoretical simulations of relevance for the pyrochlore family R[sub 2]Ti[sub 2]O[sub 7] (R=rarethinspearth ) supported by magnetothermal measurements on selected systems. By 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. [copyright] [ital 1999] [ital The American Physical Society]

• OSTI ID: 6294649
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Vol. 83:9; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

665000* -- Physics of Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL MODELS
DIPOLES
ENERGY LEVELS
GROUND STATES
ISING MODEL
MAGNETISM
MAGNETS
MATHEMATICAL MODELS
MINERALS
MULTIPOLES
ORDER-DISORDER TRANSFORMATIONS
PARAMAGNETISM
PHASE TRANSFORMATIONS
PYROCHLORE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS