Zobrazeno 1 - 10
of 100
pro vyhledávání: '"Hiromoto Uwe"'
Publikováno v:
Ferroelectrics. 430:50-56
A 180° Brillouin scattering experiment has been performed in order to clarify the dynamical mechanism of the transition from the quantum paraelectric state to the quantum ferroelectric state under [010]c uniaxial pressure in SrTiO3. A quasi-transver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8c0af5571b5bee9774c93ed2016775e1
https://doi.org/10.1080/00150193.2012.677688
https://doi.org/10.1080/00150193.2012.677688
Publikováno v:
Ferroelectrics. 380:102-105
The 180° light scattering experiment has been performed with the SrTiO 3 , 0.02 wt% Nb-doped SrTiO 3 , and 0.05 wt% Nb-doped SrTiO 3 samples. The broad doublet is found to become weaker with increasing Nb-concentration. Furthermore, the total scatte
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a819dcda323654998850027d1df96e26
https://doi.org/10.1080/00150190902873329
https://doi.org/10.1080/00150190902873329
Publikováno v:
Ferroelectrics. 375:148-155
We found previously two spectral peaks in a Nb-doped SrTiO 3 sample (conduction-electron concentration n ∼ 12.0 × 10 18 cm−3) and assigned them tentatively to “plasmon-LO phonon coupled modes”. In order to confirm this assignment, the 180°
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::88daa1558ab9a22b270cb29d21f88f62
https://doi.org/10.1080/00150190802437993
https://doi.org/10.1080/00150190802437993
Publikováno v:
Chinese Physics Letters. 25:4421-4424
Optical transmittance and reflectance on ferroelectric BaTi2O5 glasses prepared recently by a containerless synthesis technique are measured at room temperature in the wavelength range 190–800 nm. The fundamental absorption edge located around 340
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9bc716884f718a517caa17bda1168f4e
https://doi.org/10.1088/0256-307x/25/12/066
https://doi.org/10.1088/0256-307x/25/12/066
Publikováno v:
Ferroelectrics. 346:1-9
Recent studies on spectroscopic and transport properties concerning the semiconductor-metal (SM) transition in Ba 1 − x K x BiO 3 (BKBO) and BaPb x Bi 1 − x O 3 (BPBO) are reviewed. For a three-dimensional Peierls semiconductor, BaBiO3(BBO), dire
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5fa6650fb0690044f4c8e1097979e5d3
https://doi.org/10.1080/00150190601179994
https://doi.org/10.1080/00150190601179994
Publikováno v:
Ferroelectrics. 348:89-93
Single crystals of SrTiO 3 are synthesized by a floating zone method, and characterized by dislocation density, internal stress and electron mobility at low temperature. While the dislocation density is 10 2 ∼ 10 3 /cm 2 which is two orders less th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06088225fdfdeabfea6133e0cc72c4cb
https://doi.org/10.1080/00150190701196211
https://doi.org/10.1080/00150190701196211
Autor:
Javed Ahmad, Hiromoto Uwe
Publikováno v:
Physica C: Superconductivity. :288-292
Temperature dependence of optical phonon properties of Ba1−xKxBiO3 (x=0, 0.15) single crystals is investigated by far infrared optical reflectivity measurements. The Kramers Kronig (KK) analysis of the reflectivity spectra yields real part of compl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4ba669178b80f0e55c0f4e5616a32e7
https://doi.org/10.1016/j.physc.2004.01.053
https://doi.org/10.1016/j.physc.2004.01.053
Autor:
Hiromoto Uwe, Taichiro Nishio
Publikováno v:
Journal of the Physical Society of Japan. 72:1274-1278
Optical reflectivity measurements in a frequency range of 50–1000 cm -1 have been carried out for semiconducting Ba 1- x K x BiO 3 (BKBO) single crystals. Optical-phonon spectra exhibit the single-mode behavior in contrast to the two-mode one of Ba
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d551ffe983bc1bf7d3f12cb335cb10b4
https://doi.org/10.1143/jpsj.72.1274
https://doi.org/10.1143/jpsj.72.1274
Autor:
Tsuyoshi Tamegai, Takayoshi Yokoya, N. Kameda, Shik Shin, Hiromoto Uwe, Ashish Chainani, Taichiro Nishio, Takayuki Kiss, Kazuto Hirata
Publikováno v:
Physica C: Superconductivity. :97-101
Recent advances in the energy resolution and cryogenic techniques used in photoemission spectroscopy have enabled us to directly observe the superconducting electronic structure of superconductors with a relatively lower transition temperature (low-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4019ea74806fd7115c66d5b8d9fae932
https://doi.org/10.1016/s0921-4534(02)01389-8
https://doi.org/10.1016/s0921-4534(02)01389-8
Publikováno v:
Journal of Physics: Condensed Matter. 14:5477-5484
The crystal structure and electron density distribution (EDD) of superconducting Ba0.57K0.43BiO3 have been studied by the maximum-entropy method using ultra-short-wavelength x-ray diffraction data for a single crystal at 295 and 108 K. It is found th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::72a044c596ac7de0d44d758a5ef431de
https://doi.org/10.1088/0953-8984/14/22/302
https://doi.org/10.1088/0953-8984/14/22/302