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Title: Closely related magnetic and dielectric transitions in the “114” magnetoelectric Zn-doped CaBaCo{sub 4}O{sub 7}

We report on the impact of zinc doping upon the magneto-electric properties of CaBaCo{sub 4}O{sub 7}.We show that the presence of less than 1% Zn at the Co sites decreases T{sub C} from 64 K to 48 K and generates two magnetic transitions, concomitant with changes of slope of dielectric permittivity, at 54 K and 77 K, respectively. Powder neutron diffraction and magnetic data show the existence of an incommensurate magnetic phase and a spin-flop transition in this temperature range. The crossover of the magnetodielectric effect of this oxide, from positive below 50 K to negative above this temperature emphasizes the primordial role of the incommensurate magnetic phase in the evolution of these properties.
Authors:
; ; ; ;  [1] ;  [2]
  1. Laboratoire CRISMAT, UMR 6508 CNRS ENSICAEN, 6bd Maréchal Juin, 14050 CAEN (France)
  2. Institut Laue Langevin, 71 Avenue des Martyrs, 38000 Grenoble (France)
Publication Date:
OSTI Identifier:
22399164
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 24; Other Information: (c) 2014 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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; COBALT OXIDES; DIELECTRIC MATERIALS; DOPED MATERIALS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; PERMITTIVITY; POWDERS; SPIN; TEMPERATURE DEPENDENCE; ZINC