skip to main content

SciTech ConnectSciTech Connect

Title: Photo-induced change of dielectric response in BaCoSiO{sub 4} stuffed tridymite

The photodielectric effect is demonstrated in Mott-insulator BaCoSiO{sub 4} with a stuffed-tridymite-type structure under irradiation of visible light at 365 nm. The real part of dielectric permittivity is enhanced by ∼300% with little increase of tan δ in a low-frequency region. Results of diffuse reflectance spectroscopy, first-principles calculations and dielectric measurements suggest that the photodielectric effect stems from a response of photo-excited electrons in an unoccupied upper-Hubbard band for 3d-orbitals of cobalt, which have significantly small mobility due to the unique configuration of Co ions in the stuffed-tridymite-type structure.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [3]
  1. Department of Physics, Nagoya University, Nagoya 464-8602 (Japan)
  2. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587 (Japan)
  3. Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503 (Japan)
Publication Date:
OSTI Identifier:
22273524
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 16; 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; ABSORPTION SPECTROSCOPY; BARIUM COMPOUNDS; CARRIER MOBILITY; COBALT; COBALT IONS; COBALT SILICATES; DIELECTRIC MATERIALS; ELECTRONS; IRRADIATION; PERMITTIVITY; SPECTRAL REFLECTANCE; VISIBLE RADIATION