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

Journal Article · Mon Apr 28 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4872032· OSTI ID:22273524

Taniguchi, Hiroki; Okamura, Takuma; Yamamoto, Takafumi; Okazaki, Ryuji; Terasaki, Ichiro ^[1]; Moriwake, Hiroki; Kuwabara, Akihide ^[2]; Itoh, Mitsuru ^[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)

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.

• OSTI ID: 22273524
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

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