QUANTUM PARAELECTRICITY AND SUBSEQUENT DISAPPEARANCE OF BOND ALTERNATION OF MOLECULE CAUSED BY PROTON DYNAMICS IN SQUARIC ACID CRYSTAL

被引：62

作者：

MORITOMO, Y ^{[1
]}

TOKURA, Y ^{[1
]}

TAKAHASHI, H ^{[1
]}

MORI, N ^{[1
]}

机构：

[1] UNIV TOKYO,INST SOLID STATE PHYS,TOKYO 106,JAPAN

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.67.2041

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature-pressure phase diagram was determined for a crystal of squaric acid which consists of molecular sheets of [C4O4]2- skeletons and intervening protons. Under hydrostatic pressures, the paraelectric phase composed of the polar (C1 h-distorted) molecules is realized even near 0 K due to a joint quantum motion of the protons and deforming molecular skeletons. Further application of pressure causes a disappearance of the pi-bond alternation of the constituent molecule at all temperatures caused by enhanced motion of the protons.

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页码：2041 / 2044

页数：4

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