GINZBURG-LANDAU THEORY OF AN INCOMMENSURATE-TO-COMMENSURATE TRANSITION IN BARIUM SODIUM NIOBATE

被引：10

作者：

MORI, S

KOYAMA, Y

UESU, Y

机构：

[1] WASEDA UNIV,ADV RES CTR SCI & ENGN,SHINJUKU KU,TOKYO 169,JAPAN

[2] WASEDA UNIV,DEPT PHYS,SHINJUKU KU,TOKYO 169,JAPAN

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.49.621

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Features of an incommensurate-to-commensurate transition in barium sodium niobate, which is obtained in a cooling process from a tetragonal phase, have been theoretically examined on the basis of the Ginzburg-Landau theory. The present theory which takes into account the contribution of higher-order distortion waves produced from higher-order harmonics via the umklapp process, well reproduces an experimentally obtained change in an incommensurability delta on cooling. The theory also predicts both a discommensuration with a phase slip of 2pi/4 and the incommensurate-to-commensurate transition.

引用

页码：621 / 624

页数：4

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