Temperature Dependence of Raman Spectra in Cu2FeSnS4 Magnetic Semiconductor Compound

被引：7

作者：

Rincon, Carlos ^{[1
]}

Quintero, Eugenio ^{[1
]}

Quintero, Miguel ^{[1
]}

Moreno, Ekadink ^{[1
]}

Power, Chrystian ^{[1
]}

Morocoima, Manuel ^{[1
]}

Delgado, Gerzon E. ^{[2
]}

机构：

[1] Univ Los Andes, Fac Ciencias, Dept Fis, Ctr Estudios Semicond, Merida 5101, Venezuela

[2] Univ Los Andes, Fac Ciencias, Dept Quim, Lab Cristalog, Merida 5101, Venezuela

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2019年 / 256卷 / 10期

关键词：

Cu2FeSnS4; quaternary compound semiconductors; Raman spectra; Raman shift with temperature; X-RAY-DIFFRACTION; THERMAL-EXPANSION; WURTZ-STANNITE; CRYSTAL-STRUCTURE; ORDERED ARRAYS; SCATTERING; MODES; FE; CU;

D O I：

10.1002/pssb.201900076

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature dependence of the Raman scattering by phonons performed in bulk polycrystalline Cu2FeSnS4, that crystallizes with tetragonal symmetry in space group P (4) over bar, was measured between 10 and 300 K. The most important decay channel involves the three-phonon process with two phonons of the same branch, including combinations of optical phonons with equal or different frequencies. Additionally, coupling of an optical mode to two phonons of different branches is observed. The strong A-symmetry mode at 325 cm(-1) decays into two optical phonons of the same frequencies (nu) over bar (1) = (nu) over bar (2) approximate to 162 cm(-1). To explain the change of Raman shift with temperature it is necessary to take into account the contribution of thermal expansion contribution. We have observed a soft mode in the Raman spectra which accounts for the antiferromagnetic phase transition that happens in this material at a Neel temperature of about 40 K. The full width at half maximum of this A-symmetry mode, extrapolated to zero temperature, is of about 2.6 cm(-1), when the contribution of intrinsic defect scattering, which is of about 3. cm(-1), is included in the calculation.

引用

页数：8