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This content will become publicly available on December 14, 2015

Title: Experimental observation of magnetoelectricity in spin ice Dy2Ti2O7

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2]
  1. Southeast Univ., Nanjing (People's Republic of China); Nanjing Univ., Nanjing (People' Republic of China)
  2. Nanjing Univ., Nanjing (People' Republic of China)
  3. John Hopkins Univ., Baltimore, MD (United States)
  4. Southeast Univ., Nanjing (People's Republic of China)
Publication Date:
OSTI Identifier:
1238983
Grant/Contract Number:
FG02-08ER46544; 1402043B
Type:
Published Article
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 17; Journal Issue: 12; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Research Org:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
multiferroics; spin dynamics; magnetic monopole; spin ice