IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Intermediate magnetisation state, distortions and competing orders in DyTiO and HoTiO7
Autor/es:
R. A. BORZI; G. L. ROSSINI; A. P. MACKENZIE; F. A. GÓMEZ ALBARRACÍN; A. STEPKE; H. D. ROSALES; D. C. CABRA; D. PRABHAKARAN; S. A. GRIGERA
Revista:
NATURE COMMUNICATIONS
Editorial:
Nature Publishing Group
Referencias:
Año: 2016
ISSN:
2041-1723
Resumen:
Among the frustrated magnetic materials, spin-ice stands out as a particularly interesting system. Residual entropy, freezing and glassiness, Kasteleyn transitions and fractionalisation of excitations in three dimensions all stem from a simple classical Hamiltonian. But is thedipolar spin-ice Hamiltonian a correct description of the experimental systems? Here we address this issue by measuring linear susceptibility in both of the 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 polarisation, andgives important information about the possible groundstate of real spin-ice systems. Our work suggests anunusual situation in which distortions contribute to thepreservation rather than relief of the effects offrustration.