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Title: Electrocaloric effect of metal-insulator transition in VO{sub 2}

The electrocaloric effect was observed in association with an electric-field induced metal-insulator transition in VO{sub 2} using a calorimetric measurement under an applied voltage. For a VO{sub 2} plate with a 0.4 mm thickness located in the center of a capacitor-like structure, the metal-insulator transition was manipulated by applying a few volts. The occurrence of a transition in such a thick sample with relatively low voltage indicates that a surface charge accumulation mechanism is effective. The isothermal entropy change reached 94 J kg{sup −1} K{sup −1}, while the adiabatic temperature change was calculated as −3.8 K under a voltage change of 0–3 V. The large entropy change is attributed to correlation of the complex freedom among spin, charge, and lattice.
Authors:
 [1] ;  [2]
  1. Department of Materials Science, Tohoku University, Sendai 980-8579 (Japan)
  2. Green Innovative Magnetic Material Research Center, AIST Chubu, 2266-98 Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya 463-8560 (Japan)
Publication Date:
OSTI Identifier:
22415199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; 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; ELECTRIC FIELDS; ELECTRICAL INSULATORS; ENTROPY; METALS; PHASE TRANSFORMATIONS; SURFACES; THERMOELECTRIC PROPERTIES; VANADIUM OXIDES