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Title: Evidence of large magneto-dielectric effect coupled to a metamagnetic transition in Yb{sub 2}CoMnO{sub 6}

The double perovskite Yb{sub 2}CoMnO{sub 6} has been synthesized with an almost perfect checkerboard arrangement of Co{sup 2+} and Mn{sup 4+} cations in the B-sublattice of the perovskite cell. It presents an anomaly in the electric capacitance and a strong magneto-dielectric effect at about 40 K whose interplay with the microscopic magnetic behavior has been investigated by means of neutron diffraction, magnetization, pyroelectric, and relative dielectric permittivity measurements. We show that the onset of an E-type antiferromagnetic ordering of Co{sup 2+} and Mn{sup 4+} moments monitored by neutron diffraction provokes the noticeable jump of the relative dielectric permittivity (∼9%) at about 40 K. It is also shown that this jump can be totally suppressed by application of a magnetic field of μ{sub 0}H = 5 T. Neutron experiments and magnetic measurements confirm that such a suppression leading to a significant magneto-dielectric effect is driven by a metamagnetic phase transition from the peculiar E-type ordering of 3d moments into a collinear ferromagnetic order. Pyroelectric current measurements do not show any spontaneous electric polarization, so the large dielectric anomaly at zero field cannot be ascribed to a ferroelectric ordering.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [1] ;  [4]
  1. Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009 Zaragoza (Spain)
  2. Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus Univ. de Bellaterra, E-08193 Bellaterra (Spain)
  3. Institute Laue Langevin, BP 156, 38042 Grenoble Cedex 9 (France)
  4. (France)
Publication Date:
OSTI Identifier:
22483153
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; CAPACITANCE; CATIONS; COBALT IONS; FERROELECTRIC MATERIALS; MAGNETIC FIELDS; MAGNETIZATION; MANGANESE IONS; NEUTRON DIFFRACTION; NEUTRONS; PERMITTIVITY; PEROVSKITE; PHASE TRANSFORMATIONS; POLARIZATION; POTASSIUM 40