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Title: Enhanced magnetism-generated ferroelectricity in highly frustrated Fe-doped Ho{sub 2}Ti{sub 2}O{sub 7}

We present careful experiments on the ferroelectric (FE), dielectric, and magnetic behaviors of Ho{sub 2−x}Fe{sub x}Ti{sub 2}O{sub 7} with Fe{sup 3+} substitution for Ho{sup 3+}. A remarkable enhancement of polarization up to 235 μC/m{sup 2} is obtained at a low level x = 0.08, accompanied with the FE transition up to ∼80 K. The ac susceptibility under magnetic fields shows an expected saturated maximum in the real part χ′, along with an unexpected frequency-dependent peak in the imaginary part χ″, indicating unusual slow spin relaxation. The coupled correlated spin domains through dipolar interaction are argued to give rise to nonzero electric-dipole via Dzyaloshinskii-Moriya interaction.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ;  [4] ;  [1]
  1. Department of Physics, Southeast University, Nanjing 211189 (China)
  2. (China)
  3. Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093 (China)
  4. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218 (United States)
Publication Date:
OSTI Identifier:
22410113
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; DOPED MATERIALS; ELECTRIC DIPOLES; FERROELECTRIC MATERIALS; FREQUENCY DEPENDENCE; HOLMIUM COMPOUNDS; HOLMIUM IONS; IRON COMPOUNDS; IRON IONS; MAGNETIC FIELDS; MAGNETISM; PHASE TRANSFORMATIONS; POLARIZATION; RELAXATION; SPIN; TEMPERATURE DEPENDENCE; TITANATES