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Title: Giant magnetocaloric effect in magnetoelectric Eu{sub 1-x}Ba{sub x}TiO{sub 3}

We report the magnetic entropy change (ΔS{sub m}) in magnetoelectric Eu{sub 1-x}Ba{sub x}TiO{sub 3} for 0.1 ≤ x ≤ 0.9. We find −ΔS{sub m} = 11 (40) J/kg·K in x = 0.1 for a field change of 1 (5) T, respectively, which is the largest value among all Eu-based oxides. ΔS{sub m} arises from the field-induced suppression of the spin entropy of Eu{sup 2+}:4f{sup 7} localized moments. While ∣−ΔS{sub m}∣ decreases with increasing x, ∣−ΔS{sub m}∣ = 6.58 J/kg·K observed in the high spin diluted composition x = 0.9 is larger than that in many manganites. Our results indicate that these magnetoelectrics are potential candidates for cryogenic magnetic refrigeration.
Authors:
; ; ; ; ;  [1]
  1. Department of Physics, 2 Science Drive 3, Faculty of Science, National University of Singapore, Singapore 117551 (Singapore)
Publication Date:
OSTI Identifier:
22280585
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 3; 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; BARIUM COMPOUNDS; CONCENTRATION RATIO; ELECTRICAL PROPERTIES; ENTROPY; EUROPIUM IONS; EUROPIUM OXIDES; MAGNETIC PROPERTIES; SPIN; TITANATES