ANOMALOUS VARIATION OF PHONON RAMAN INTENSITIES NEAR THE METAL-TO-MOTT-INSULATOR TRANSITION IN TITANIUM-OXIDE SYSTEMS

被引：37

作者：

KATSUFUJI, T

TOKURA, Y

机构：

[1] Department of Physics, University of Tokyo

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.50.2704

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman-scattering spectra were investigated for strongly correlated electron systems, La1-xSrxTiO3 and Y1-xCaxTiO3, which undergo a metal-to-Mott-insulator transition under variation of the band filling. The phonon spectra decrease in their intensity as the system approaches the metal-insulator phase boundary, accompanied by a critical enhancement of the value of the effective mass, and almost disappear in the insulating phase. We found that the phonon spectral intensity in the metallic region approximately scales with (n/m*)2, n and m* being the density and effective mass of conduction carriers.

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页码：2704 / 2707

页数：4

相关论文

共 13 条

[1] INFRARED-SPECTRA OF RARE-EARTH PEROVSKITES LZO3 (Z=AL, CR, FE, CO) [J].

COUZI, M ;

VANHUONG, P .

JOURNAL DE CHIMIE PHYSIQUE ET DE PHYSICO-CHIMIE BIOLOGIQUE, 1972, 69 (09) :1339-&

[2] REFLECTANCE AND RESISTIVITY OF BARELY METALLIC LATIO3 [J].

CRANDLES, DA ;

TIMUSK, T ;

GREEDAN, JE .

PHYSICAL REVIEW B, 1991, 44 (24) :13250-13254

[3] OPTICAL-CONDUCTIVITY SPECTRA OF SR1-XLAXTIO3 - FILLING-DEPENDENT EFFECT OF THE ELECTRON CORRELATION [J].

FUJISHIMA, Y ;

TOKURA, Y ;

ARIMA, T ;

UCHIDA, S .

PHYSICAL REVIEW B, 1992, 46 (17) :11167-11170

[4]

KATSUFUJI T, UNPUB

[5] METAL-INSULATOR-TRANSITION IN LA1-XSRXTIO3 AND Y1-XCAXTIO3 INVESTIGATED BY SPECIFIC-HEAT MEASUREMENTS [J].

KUMAGAI, K ;

SUZUKI, T ;

TAGUCHI, Y ;

OKADA, Y ;

FUJISHIMA, Y ;

TOKURA, Y .

PHYSICAL REVIEW B, 1993, 48 (10) :7636-7642

[6]

LOCKWOOD DJ, 1974, ANHARMONIC LATTICES, P147

[7] THEORY OF RAMAN EFFECT IN METALS [J].

MILLS, DL ;

MARADUDI.AA ;

BURSTEIN, E .

ANNALS OF PHYSICS, 1970, 56 (02) :504-&

[8] DOPING-INDUCED AND PRESSURE-INDUCED CHANGE OF ELECTRICAL AND MAGNETIC-PROPERTIES IN THE MOTT-HUBBARD INSULATOR LATIO3 [J].

OKADA, Y ;

ARIMA, T ;

TOKURA, Y ;

MURAYAMA, C ;

MORI, N .

PHYSICAL REVIEW B, 1993, 48 (13) :9677-9683

[9] PHASE-TRANSITION OF 2-DIMENSIONAL SQUARIC ACID H2C4O4 STUDIED BY RAMAN-SCATTERING [J].

SAMUELSEN, EJ ;

FJAER, E ;

SEMMINGSEN, D .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (11) :2007-2014

[10] SYNTHESIS, STRUCTURE, AND PROPERTIES OF LA1-XSRXTIO3 (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) [J].

SUNSTROM, JE ;

KAUZLARICH, SM ;

KLAVINS, P .

CHEMISTRY OF MATERIALS, 1992, 4 (02) :346-353