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

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

doi:10.1103/PhysRevB.88.054406

paper

Anisotropic Monopole Heat Transport in the Spin-Ice Compound Dy $_{2}$ Ti $_{2}$ O $_{7}$

arXiv:1302.6114 · doi:10.1103/PhysRevB.88.054406

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 κ $an d b y a dd i t i o na l m e a s u r e m e n t so n t h e p h o n o ni cr e f er e n ceco m p o u n d s Y$ _2 $T i$ _2 $O$ _7 $an d D y Y T i$ _2 $O$ _7 $, w e a r e ab l e t ose p a r a t e t h e p h o n o ni c an d t h e ma g n e t i cco n t r ib u t i o n s t o t h e t o t a l h e a tt r an s p or t, i . e .$ κ_{ph} $an d$ κ_{mag} $, r es p ec t i v e l y, w hi c hb o t h d e p e n d o n t h e ma g n e t i c f i e l d . T h e f i e l dd e p e n d e n t$ κ_{ph} $a r i ses f r o m l a tt i ce d i s t or t i o n s d u e t o ma g n e t i c - f i e l d in d u ce d t or q u eso n t h e n o n - co l l in e a r ma g n e t i c m o m e n t so f t h eD y i o n s . F or$ κ_{mag} $, w eo b ser v e ahi g h l y ani so t r o p i c ma g n e t i c - f i e l dd e p e n d e n ce, w hi c h cor r e l a t es w i t h t h ecor r es p o n d in g ma g n e t i z a t i o n d a t a r e f l ec t in g t h e d i f f er e n t ma g n e t i c - f i e l d in d u ce d s p in - i ce g r o u n d s t a t es . T h e ma g ni t u d eo f$ κ_{mag} $in cr e a ses w i t h t h e d e g r eeo f t h e g r o u n d - s t a t e d e g e n er a cy . T hi s ani so t r o p i c f i e l dd e p e n d e n ce a s w e l l a s v a r i o u s h y s t er es i se f f ec t ss ug g es tt ha t$ κ_{mag}$ is essentially determined by the mobility of the magnetic monopole excitations in spin ice.

8 pages, 5 figures

Anisotropic Monopole Heat Transport in the Spin-Ice Compound Dy2​Ti2​O7​

Abstract

Anisotropic Monopole Heat Transport in the Spin-Ice Compound Dy $_{2}$ Ti $_{2}$ O $_{7}$