SOFT ROTARY MODE IN THE ANTIFLUORITE CRYSTAL K2OSCL6

被引：37

作者：

MINTZ, D ^{[1
]}

ARMSTRONG, RL ^{[1
]}

POWELL, BM ^{[1
]}

BUYERS, WJL ^{[1
]}

机构：

[1] ATOM ENERGY CANADA LTD,CHALK RIVER NUCL LABS,CHALK RIVER K0J 1J0,ONTARIO,CANADA

来源：

PHYSICAL REVIEW B | 1979年 / 19卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.19.448

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inelastic-neutron-scattering techniques have been used to study the structural phase transition in potassium hexachloro osmate (K2OsCl6). A low-frequency relatively flat phonon branch, identified to be the longitudinal-rotary mode, was observed in the [001] direction. This branch rises steeply in the perpendicular [350] direction indicating two-dimensional correlations in the motions of the OsCl6 octahedra. Although the entire [001] branch softens as the phase transition is approached, it is the frequency of the zone-center phonon that exhibits the most rapid softening, consistent with its being the mode that triggers the structural transition. A simple damped-harmonic-oscillator analysis is presented. © 1979 The American Physical Society.

引用

页码：448 / 451

页数：4

共 6 条

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[2]

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[3]

LYNN JE, UNPUBLISHED

[4] PHASE TRANSITIONS AND SOFT LIBRATIONAL MODES IN CUBIC CRYSTALS [J].

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[5] LATTICE DYNAMICAL MODEL CALCULATION OF ANGULAR VIBRATIONAL AMPLITUDE OF RE-CL BOND IN K2RECL6 [J].

VANDRIEL, HM ;

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JOURNAL OF MAGNETIC RESONANCE, 1975, 18 (03) :485-496

[6]

WILLEMSEN HW, 1975, THESIS U TORONTO

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