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Title: Experimental observation of magnetoelectricity in spin ice Dy 2 Ti 2 O 7

Journal Article · · New Journal of Physics

The intrinsic noncollinear spin patterns in rare-earth pyrochlore are physically interesting, due to their many emergent properties (e.g., spin-ice and monopole-type excitation). Recent works have suggested that the magnetic monopole excitation of spin-ice systems is magnetoelectric active, but this fact has rarely been confirmed via experiment. In this work, we performed a systematic experimental investigation on the magnetoelectricity of Dy2Ti2O7 by probing the ferroelectricity, spin dynamics, and dielectric behaviors. Two ferroelectric transitions at Tc1 = 25 K and Tc2 =13 K were observed. Remarkable magnetoelectric coupling was identified below the lower transition temperature, with significant suppression of the electric polarization on applied magnetic field. Our results show that the lower ferroelectric transition temperature coincides with the Ising-spin paramagnetic transition point, below which the quasi-particle-like monopoles are populated, which indicates implicit correlation between electric dipoles and spin moments. The possible magnetoelectric mechanisms are discussed. Our findings can be used for more investigations to explore multiferroicity in these spin-ice systems and other frustrated magnets.

Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-08ER46544; 1402043B
OSTI ID:
1238983
Alternate ID(s):
OSTI ID: 1238984; OSTI ID: 1240129
Journal Information:
New Journal of Physics, Vol. 17, Issue 12; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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