Electric field and temperature dependence of dielectric permittivity in strontium titanate investigated by a photoemission study on Pt/SrTiO{sub 3}:Nb junctions

Journal Article · Mon May 11 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4921092· OSTI ID:22399035

Hirose, Sakyo ^[1]; Okushi, Hideyo; Yoshikawa, Hideki; Adachi, Yutaka; Ohsawa, Takeo; Haneda, Hajime ^[1]; Ueda, Shigenori ^[2]; Ando, Akira ^[3]; Ohashi, Naoki ^[1]

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1. National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044 (Japan)
2. Synchrotron X-ray Station at SPring-8, NIMS, 1-1-1 Kouto, Sayo, Hyogo 679-5148 (Japan)
3. Murata Manufacturing Co., Ltd., 10–1, Higashikotari 1–chome, Nagaokakyo–shi, Kyoto 617–8555 (Japan)

Schottky junctions made from platinum and niobium-doped strontium titanate (SrTiO{sub 3}:Nb) were investigated by hard X-ray photoemission (HXPES) and through a band bending behavior simulation using a phenomenological model, which assumes a decrease in dielectric constant due to an electric field. Thus, we confirmed that the observed HXPES spectra at relatively high temperatures, e.g., >250 K, were well simulated using this phenomenological model. In contrast, it was inferred that the model was not appropriate for junction behavior at lower temperatures, e.g., <150 K. Therefore, a reconstruction of the phenomenological model is necessary to adequately explain the dielectric properties of SrTiO{sub 3}.

• OSTI ID: 22399035
• Journal Information: Applied Physics Letters, Vol. 106, Issue 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DIELECTRIC MATERIALS
DOPED MATERIALS
ELECTRIC CONTACTS
ELECTRIC FIELDS
EMISSION SPECTRA
HARD X RADIATION
NIOBIUM
PERMITTIVITY
PHOTOEMISSION
PLATINUM
SEMICONDUCTOR JUNCTIONS
STRONTIUM TITANATES
TEMPERATURE DEPENDENCE