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Low temperature and field studies on the Spin Ice Materials Dy_2Ti_2O_7 and Ho_2Ti_2O_7
##manager.scheduler.building##: Edificio San Jose
##manager.scheduler.room##: Aula 110/111
Date: 2019-07-12 12:15 PM – 12:30 PM
Last modified: 2019-06-10
Abstract
Spin ice materials, of which Dy_2Ti_2O_7 and Ho_2Ti_2O_7 are usual examples, are geometrically frustrated magnetic systems. Their defining property is the lack of order at the lowest temperatures, leading to an effective residual entropy quite similar to thatmeasured in common water ice.
A magnetic field has a profound effect on the magnetism of Spin Ice, on account of the big magnetic moments of Dy^+3 and Ho^+3 ions, and pronounced local anisotropy. It can thus be used to produce othertypes of partially or totally ordered structures of varying dimensionallity, through crossovers, or conventional and topological phase transitions.
In this work we study the dynamics and thermodynamics of thesematerials using magnetisation and ac-susceptibility. The region of interest is that of low temperatures with magnetic fields, applied along [100] and [111] directions. The contrast between this two crystalographic directions, and with numerical simulations, allows for a more controlled approach to the complex system dynamics, and to the Kasteleyn transition which occurs for fields along [100]. Preliminary studies including strain applied through a piezoelectric device, show an increase in susceptibility as a the systems is driven towards a predicted Infinite Order Multicritical transition.
A magnetic field has a profound effect on the magnetism of Spin Ice, on account of the big magnetic moments of Dy^+3 and Ho^+3 ions, and pronounced local anisotropy. It can thus be used to produce othertypes of partially or totally ordered structures of varying dimensionallity, through crossovers, or conventional and topological phase transitions.
In this work we study the dynamics and thermodynamics of thesematerials using magnetisation and ac-susceptibility. The region of interest is that of low temperatures with magnetic fields, applied along [100] and [111] directions. The contrast between this two crystalographic directions, and with numerical simulations, allows for a more controlled approach to the complex system dynamics, and to the Kasteleyn transition which occurs for fields along [100]. Preliminary studies including strain applied through a piezoelectric device, show an increase in susceptibility as a the systems is driven towards a predicted Infinite Order Multicritical transition.