Anisotropic Monopole Heat Transport in the Spin-Ice Compound   Dy$_2$Ti$_2$O$_7$

G. Kolland; M. Valldor; M. Hiertz; J. Frielingsdorf; and T. Lorenz

arXiv:1302.6114·cond-mat.str-el·June 15, 2015

Anisotropic Monopole Heat Transport in the Spin-Ice Compound Dy$_2$Ti$_2$O$_7$

G. Kolland, M. Valldor, M. Hiertz, J. Frielingsdorf, and T. Lorenz

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TL;DR

This study investigates the anisotropic heat transport in Dy$_2$Ti$_2$O$_7$ spin ice, revealing how magnetic monopole excitations and lattice distortions influence thermal conductivity under magnetic fields.

Contribution

It separates phononic and magnetic contributions to heat transport in Dy$_2$Ti$_2$O$_7$ and links magnetic monopole mobility to anisotropic thermal conductivity behavior.

Findings

01

Magnetic field induces anisotropic changes in thermal conductivity.

02

Magnetic monopole excitations significantly contribute to heat transport.

03

Lattice distortions affect phononic thermal conductivity.

Abstract

We report a study of the thermal conductivity $κ$ of the spin-ice material Dy $_{2}$ Ti $_{2}$ O $_{7}$ . From the anisotropic magnetic-field dependence of \kappa $an d b y a dd i t i o na l m e a s u r e m e n t so n t h e p h o n o ni cr e f er e n ceco m p o u n d s Y$ _2 $T i$ _2 $O$ _7 $an d D y Y T i$ _2 $O$ _7 $, w e a r e ab l e t ose p a r a t e t h e p h o n o ni c an d t h e ma g n e t i cco n t r ib u t i o n s t o t h e t o t a l h e a tt r an s p or t, i . e .$ \kappa_{ph} $an d$ \kappa_{mag} $, r es p ec t i v e l y, w hi c hb o t h d e p e n d o n t h e ma g n e t i c f i e l d . T h e f i e l dd e p e n d e n t$ \kappa_{ph} $a r i ses f r o m l a tt i ce d i s t or t i o n s d u e t o ma g n e t i c - f i e l d in d u ce d t or q u eso n t h e n o n - co l l in e a r ma g n e t i c m o m e n t so f t h eD y i o n s . F or$ \kappa_{mag} $, w eo b ser v e ahi g h l y ani so t r o p i c ma g n e t i c - f i e l dd e p e n d e n ce, w hi c h cor r e l a t es w i t h t h ecor r es p o n d in g ma g n e t i z a t i o n d a t a r e f l ec t in g t h e d i f f er e n t ma g n e t i c - f i e l d in d u ce d s p in - i ce g r o u n d s t a t es . T h e ma g ni t u d eo f$ \kappa_{mag}$ increases with the degree of the ground-state…

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