title: Intermediate magnetization state and competing orders in Dy2Ti2O7 and Ho2Ti2O7.
abstract: Among the frustrated magnetic materials, spin-ice stands out as a particularly interesting system. Residual entropy, freezing and glassiness, Kasteleyn transitions and fractionalization of excitations in three dimensions all stem from a simple classical Hamiltonian. But is the usual spin-ice Hamiltonian a correct description of the experimental systems? Here we address this issue by measuring magnetic susceptibility in the two most studied spin-ice compounds, Dy2Ti2O7 and Ho2Ti2O7, using a vector magnet. Using these results, and guided by a theoretical analysis of possible distortions to the pyrochlore lattice, we construct an effective Hamiltonian and explore it using Monte Carlo simulations. We show how this Hamiltonian reproduces the experimental results, including the formation of a phase of intermediate polarization, and gives important information about the possible ground state of real spin-ice systems. Our work suggests an unusual situation in which distortions might contribute to the preservation rather than relief of the effects of frustration.
authors: Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, La Plata 1900, Argentina.|Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.
authors: R A
authors: RA
authors: Borzi
authors: Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.|Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina.
authors: F A
authors: FA
authors: Gómez Albarracín
authors: Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.|Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina.
authors: H D
authors: HD
authors: Rosales
authors: Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.|Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina.
authors: G L
authors: GL
authors: Rossini
authors: School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK.|Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, Germany.
authors: A
authors: 0000-0001-6495-3917
authors: A
authors: Steppke
authors: Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK.
authors: D
authors: D
authors: Prabhakaran
authors: School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK.|Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, Germany.
authors: A P
authors: AP
authors: Mackenzie
authors: Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.|Instituto de Física de La Plata, UNLP-CONICET, 1900 La Plata, Argentina.
authors: D C
authors: DC
authors: Cabra
authors: Instituto de Física de Líquidos y Sistemas Biológicos (IFLYSIB), UNLP-CONICET, La Plata 1900, Argentina.|Departamento de Física, Facultad de Ciencias Exactas,Universidad Nacional de La Plata, 1900 La Plata, Argentina.|School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK.
authors: S A
authors: SA
authors: Grigera