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

Abstract

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

Citation Formats

Matsunami, Daichi, E-mail: dmatsunami@s.tohoku.ac.jp, and Fujita, Asaya. Electrocaloric effect of metal-insulator transition in VO{sub 2}. United States: N. p., 2015. Web. doi:10.1063/1.4906801.
Matsunami, Daichi, E-mail: dmatsunami@s.tohoku.ac.jp, & Fujita, Asaya. Electrocaloric effect of metal-insulator transition in VO{sub 2}. United States. doi:10.1063/1.4906801.
Matsunami, Daichi, E-mail: dmatsunami@s.tohoku.ac.jp, and Fujita, Asaya. Mon . "Electrocaloric effect of metal-insulator transition in VO{sub 2}". United States. doi:10.1063/1.4906801.
@article{osti_22415199,
title = {Electrocaloric effect of metal-insulator transition in VO{sub 2}},
author = {Matsunami, Daichi, E-mail: dmatsunami@s.tohoku.ac.jp and Fujita, Asaya},
abstractNote = {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.},
doi = {10.1063/1.4906801},
journal = {Applied Physics Letters},
number = 4,
volume = 106,
place = {United States},
year = {Mon Jan 26 00:00:00 EST 2015},
month = {Mon Jan 26 00:00:00 EST 2015}
}