IFLYSIB   05383
INSTITUTO DE FISICA DE LIQUIDOS Y SISTEMAS BIOLOGICOS
Unidad Ejecutora - UE
artículos
Título:
Thermal Relaxation and Heat Transport in the Spin Ice Material Dy2Ti2O7
Autor/es:
B. KLEMKE; M. MEISSNER; P. STREHLOW; K. KIEFER; S. A. GRIGERA; D. A. TENNANT
Revista:
JOURNAL OF LOW TEMPERATURE PHYSICS
Editorial:
SPRINGER/PLENUM PUBLISHERS
Referencias:
Año: 2011 vol. 163 p. 345 - 369
ISSN:
0022-2291
Resumen:
The thermal properties of single crystalline Dy2Ti2O7 have been studied in
a temperature range from 0.3 K to 30 K and magnetic fields applied along [110] direction
up to 1.5 T. Based on a thermodynamic field theory various heat relaxation and
thermal transport measurements were analysed. So we were able to present not only
the heat capacity of Dy2Ti2O7 in the whole temperature and magnetic field range,
but also the different contributions of the magnetic excitations and their corresponding
relaxation times in the spin ice phase. In addition, the thermal conductivity and
the shortest relaxation time were determined by thermodynamic analysis of steady
state heat transport measurements. Finally, we were able to reproduce the temperature
profiles recorded in heat pulse experiments on the basis of the thermodynamic field theory using the previously determined heat capacity and thermal conductivity
data without additional parameters. Thus, the thermodynamic field theory has been
proved to be thermodynamically consistent in describing three thermal transport experiments
on different time scales. The observed temperature and field dependencies
of heat capacity contributions and relaxation times indicate the magnetic excitations
in the spin ice material Dy2Ti2O7 as thermally activated monopole-antimonopole defects.