AC LOSSES AND SUBMILLIMETER ABSORPTION IN SINGLE-CRYSTALS LA2CUO4

被引：3

作者：

VARYUKHIN, SV ^{[1
]}

ZAKHAROV, AA ^{[1
]}

GERSHENZON, EM ^{[1
]}

GOLTSMAN, GN ^{[1
]}

PTITSYNA, NG ^{[1
]}

CHULKOVA, GM ^{[1
]}

机构：

[1] MOSCOW STATE PEDAGOG INST,MOSCOW 119435,RUSSIA

来源：

PHYSICA B | 1990年 / 165卷

关键词：

D O I：

10.1016/S0921-4526(09)80220-2

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The La2CuO4 single crystals were used to carry out the measurements of transmission spectra within the submillimeter range of wavelengths, as well as the capacitance C and conductivity G in the region of acoustic frequencies of the metal-dielectric-La2Cu04 system at low temperatures. The optical spectra display a threshold character. There takes place a sharp decreasing of transmission signal in the energy range of hυ〉1.5meV. The C(ω,T) and G(ω,T) dependences have a universal form characteristic of relaxation processes of the Debye type. The relaxation time dependence displays a thermoactivation character τ(T)-exp(ξ/T) with a gap value of ξ≃2meV,coinciding with the optical one. It is assumed that there exist excitations with a characteristic energy ~ 2meV in La2Cu04.A possible nature of the revealed low-energy excitations is discussed. © 1990, Elsevier Science Publishers B.V. (North-Holland). All rights reserved.

引用

页码：1269 / 1270

页数：2

共 4 条

[1] ANTIFERROMAGNETIC-RESONANCE IN LA2-XCUO4-Y [J].

COLLINS, RT ;

SCHLESINGER, Z ;

SHAFER, MW ;

MCGUIRE, TR .

PHYSICAL REVIEW B, 1988, 37 (10) :5817-5819

[2] TWO-DIMENSIONAL ZONE-CENTER SPIN-WAVE EXCITATIONS IN LA2CUO4 [J].

PETERS, CJ ;

BIRGENEAU, RJ ;

KASTNER, MA ;

YOSHIZAWA, H ;

ENDOH, Y ;

TRANQUADA, J ;

SHIRANE, G ;

HIDAKA, Y ;

ODA, M ;

SUZUKI, M ;

MURAKAMI, T .

PHYSICAL REVIEW B, 1988, 37 (16) :9761-9764

[3] LARGE DIELECTRIC-CONSTANTS AND MASSIVE CARRIERS IN LA2CUO4 [J].

REAGOR, D ;

AHRENS, E ;

CHEONG, SW ;

MIGLIORI, A ;

FISK, Z .

PHYSICAL REVIEW LETTERS, 1989, 62 (17) :2048-2051

[4]

ZVEZDIN AK, 1989, IGP AS44 PREPR

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