Ellipsometric study of electronic excitations in triglycine sulphate and triglycine selenate crystals

被引：4

作者：

Andriyevsky, Bohdan ^{[1
]}

Patryn, Aleksy ^{[1
]}

Cobet, Christoph ^{[2
]}

Mytsyk, Bogdan ^{[3
]}

Esser, Norbert ^{[2
]}

机构：

[1] Koszalin Univ Technol, Fac Elect & Comp Sci, PL-75453 Koszalin, Poland

[2] Dept Berlin, Inst Analyt Sci, D-12489 Berlin, Germany

[3] Ukrainian Natl Acad Sci, Karpenko Phys & Mech Inst, UA-79601 Lvov, Ukraine

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2009年 / 246卷 / 10期

关键词：

FERROELECTRIC PHASE; OPTICAL-SPECTRA; GLYCINE SULFATE; BAND-STRUCTURE; TGS CRYSTALS;

D O I：

10.1002/pssb.200844384

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The real and imaginary parts of the pseudo-dielectric susceptibility, <chi(1)>(E) and <chi(2)>(E) of triglycine sulphate (TGS) and triglycine selenate (TGSe) ferroelectric crystals have been obtained in the range 4-9.8 eV by spectroscopic ellipsometry using the Berlin Electron Storage Ring for synchrotron radiation source. A first maximum in <chi(2)>(E) was found at E = 7.3 eV for both crystals and is attributed to the excitation of p-electrons of oxygen. The spectra were measured at different temperatures in the range comprising the ferroelectric phase transition temperatures, 49 degrees C (TGS) and 22 degrees C (TGSe). Of note is the peak-like behaviour in <chi(1)>(T) and <chi(2)>(T) nearthe phase transition temperature and aconsiderable decrease (about 50%) of the reflected light intensity I(R) in the range below the phase transition temperature (T < T(C)). The latter is probably caused by light scattering on the ferroelectric domain walls. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2337 / 2340

页数：4

共 16 条

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