Optical-Phonon Precursory Behavior towards Semiconductor-Metal Transition in Ba_<1-x>K_xBiO_3 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
スポンサーリンク
概要
- 論文の詳細を見る
Optical reflectivity measurements in a frequency range of 50-1000 cm^<-1> have been carried out for semiconducting Ba_<1-x>K_xBiO_3 (BKBO) single crystals. Optical-phonon spectra exhibit the single-mode behavior in contrast to the two-mode one of BaPb_xBi_<1-x>O_3 (BPBO). Frequencies plot for transverse-optical (TO) and longitudinal-optical (LO) phonons in BKBO almost coincides with the upper-mode frequencies for the two-mode BPBO derived from the terminal BaBiO_3. The Szigeti-effective-charge difference Δe^*_s between inequivalent Bi sites is estimated from the oscillator strength of the third-highest-frequency TO-phonon mode for each concentration. The results show that Δe^*_s is anomalously large as compared with the nominal one and tends to go to zero as x goes to a critical concentration of the semiconductor-metal transition. We conclude that the charge difference arises from a strong dynamical charge transfer during the anti-parallel vibrational motion of Bi ions.
- 社団法人日本物理学会の論文
- 2003-05-15
著者
-
Nishio Taichiro
Institute Of Materials Science University Of Tsukuba
-
UWE Hiromoto
Institute of Applied Physics, University of Tsukuba
-
Uwe Hiromoto
Institute Of Materials Science University Of Tsukuba
-
Uwe Hiromoto
Institure Of Applied Physics University Of Tsukuba
-
Nishio T
Institute Of Materials Science University Of Tsukuba
関連論文
- Fabrication of Schottky Junction Between Au and SrTiO_3
- Y-Ba-Cu Oxide Films Formed with Pulsed-Laser Induced Fragments : Electrical Properties of Condensed Matter
- Optical-Phonon Precursory Behavior towards Semiconductor-Metal Transition in Ba_K_xBiO_3 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
- Dielectric Dispersion and Twin Structure in Hexagonal Barium Titanate
- Elastic Properties and the Phase Transitions in Hexagonal Barium Titanate
- Raman-Scattering Study of the Soft Phonon Modes in Hexagonal Barium Titanate
- Optical-Phonon Precursory Behavior towards Semiconductor-Metal Transition in Ba_K_xBiO_3
- Preparation and Property of La_Sr_CuO_4 Single Crystal
- Effect of Hole-Doping in High-T_c Ln_1Ba_2Cu_3O_(Ln=Nd,La,Pr) : Electrical Properties of Condensed Matter
- 21pTP-6 Anomalous temperature dependence of the optical phonon properties of Ba_K_xBiO_3 single crystals
- Uniaxial Stress Effect on the Superconductivity of Grain-Aligned Composites of La_Sr_xCuO4
- Composition Effects on Properties of the Perovskite Superconductor Ba (Pb,Bi) O_3
- Effect of Hetero-Valent-Ion Doping in the High T_c Y-Ba-Cu-O Superconductor
- Estimation of the Filling Factor of the High T_c Superconducting Phase in Y-Ba-Cu-O Mixed System
- Synthesis of Superconducting Epitaxial Films of Ba_K_xBiO_3 by Laser Ablation
- 31a-Q-3 Metal-Insulator Transition in Doped Hexagonal Barium Titanate
- Dielectric Property of Epitaxial Films of BaTiO_3 Synthesized by Laser Ablation ( FERROELECTRIC MATERIALS AND THEIR APPLICATIONS)
- Magnetic Breakdown Effect in KTaO_3 : II. LOW TEMPERATURE PROPERTIES OF SOLIDS : Metals and Semiconductors
- Composition Dependence of the Superconductivity in (Ba, Sr)(Pb, Bi)O_3
- 31a-Q-3 Metal-Insulator Transition in Doped Hexagonal Barium Titanate
- Effect of Iron-Group-Ion Doping on the Properties of BaTiO_3 Ceramics : Fundamentals
- Stress-Induced Quantum Ferroelectricity in SrTiO_3
- Electrical Conductivity of the Oxide Superconductor Ba_K_BiO_
- Normal-State Uniform Magnetic Susceptibility and Superconductivity in Bi_2Sr_zCa_Cu_2O_y
- Estimation of the Filling Factor of the High $T_{\text{c}}$ Superconducting Phase in Y–Ba–Cu–O Mixed System