Precursor polar clusters in the paraelectric phase of ferroelectric Ba0.80Ca0.20TiO3 single crystals studied by Brillouin light scattering

被引：15

作者：

Kim, Tae Hyun ^{[1
]}

Kojima, Seiji ^{[2
]}

Park, Kibog ^{[3
]}

Kim, Sung Baek ^{[4
]}

Ko, Jae-Hyeon ^{[1
]}

机构：

[1] Hallym Univ, Dept Phys, 39 Hallymdaehakgil, Chunchon 200702, Gangwondo, South Korea

[2] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

[3] Ulsan Natl Inst Sci & Technol, Sch Elect & Comp Engn, Ulsan 689798, South Korea

[4] Kookmin Univ, Dept Phys, Seoul 136702, South Korea

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2010年 / 22卷 / 22期

关键词：

BARIUM-TITANATE; CUBIC BATIO3; TRANSITION; MODES; KNBO3;

D O I：

10.1088/0953-8984/22/22/225904

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

A strong relaxation mode was observed in the gigahertz frequency window in the paraelectric phase of Ba0.80Ca0.20TiO3 single crystals by using Brillouin light scattering. The appearance and growth of this relaxation mode were accompanied by substantial softening of the longitudinal acoustic mode as well as a remarkable increase in the hypersonic damping. Similar to BaTiO3, the temperature dependence of the relaxation time of Ba0.80Ca0.20TiO3 displayed a slowing-down behavior near the Curie temperature, indicating the order-disorder nature of the paraelectric-ferroelectric phase transition in this substance. The dynamics of precursor polar clusters observed in this work was discussed in relation with recent theoretical studies and found to be consistent with their predictions.

引用

页数：6

共 33 条

[1] Critical slowing down of relaxation dynamics near the Curie temperature in the relaxor Pb(Sc0.5Nb0.5)O3 [J].

Ahart, Muhtar ;

Hushur, Anwar ;

Bing, Yonghong ;

Ye, Zuo-Guang ;

Hemley, Russell J. ;

Kojima, Seiji .

APPLIED PHYSICS LETTERS, 2009, 94 (14)

[2] POLARIZATION IN THE CUBIC PHASE OF BATIO3 [J].

BURNS, G ;

DACOL, FH .

SOLID STATE COMMUNICATIONS, 1982, 42 (01) :9-12

[3] Precursor effects, broken local symmetry, and coexistence of order-disorder and displacive dynamics in perovskite ferroelectrics [J].

Bussmann-Holder, A. ;

Beige, H. ;

Voelkel, G. .

PHYSICAL REVIEW B, 2009, 79 (18)

[4] CRYSTAL STABILITY AND THE THEORY OF FERROELECTRICITY [J].

COCHRAN, W .

ADVANCES IN PHYSICS, 1960, 9 (36) :387-423

[5] CHAIN STRUCTURE OF BATIO3 AND KNBO3 [J].

COMES, R ;

LAMBERT, M ;

GUINIER, A .

SOLID STATE COMMUNICATIONS, 1968, 6 (10) :715-&

[6] Anomalous phase diagram of ferroelectric (Ba,Ca)TiO3 single crystals with giant electromechanical response [J].

Fu, Desheng ;

Itoh, Mitsuru ;

Koshihara, Shin-ya ;

Kosugi, Taichi ;

Tsuneyuki, Shinji .

PHYSICAL REVIEW LETTERS, 2008, 100 (22)

[7] Local free energy in the paraelectric phase of barium titanate [J].

Geneste, Gregory .

PHYSICAL REVIEW B, 2009, 79 (14)

[8] NEUTRON-SCATTERING STUDYOF SOFT MODES IN CUBIC BATIO3 [J].

HARADA, J ;

AXE, JD ;

SHIRANE, G .

PHYSICAL REVIEW B-SOLID STATE, 1971, 4 (01) :155-+

[9] Coexistence of the Phonon and Relaxation Soft Modes in the Terahertz Dielectric Response of Tetragonal BaTiO3 [J].

Hlinka, J. ;

Ostapchuk, T. ;

Nuzhnyy, D. ;

Petzelt, J. ;

Kuzel, P. ;

Kadlec, C. ;

Vanek, P. ;

Ponomareva, I. ;

Bellaiche, L. .

PHYSICAL REVIEW LETTERS, 2008, 101 (16)

[10] Relaxation mode in 0.65Pb(MgU1/3Nbu2/3)O3-0.35PbTiO3 relaxor single crystals studied by micro-Brillouin scattering [J].

Jiang, FM ;

Kojima, S .

PHYSICAL REVIEW B, 2000, 62 (13) :8572-8575

← 1 2 3 4 →