MOLECULAR DISPLACEMENTS IN THE SPIN-DIMERIZED STATE OF (TETRATHIAFULVALENE)CUS4C4(CF3)4 AT 4.2 K

被引:23
作者
KASPER, JS [1 ]
MONCTON, DE [1 ]
机构
[1] BELL TEL LABS INC,MURRAY HILL,NJ 07974
来源
PHYSICAL REVIEW B | 1979年 / 20卷 / 06期
关键词
D O I
10.1103/PhysRevB.20.2341
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have carried out a crystallographic study of the dimerized state of the spin-Peierls compound (TTF)Cu(BDT). X-ray data taken below the dimerization transition at Tc=12 K were analyzed using a model which assumes rigid molecular displacements. We find that pairing is accomplished by a simple longitudinal translation of spin-1/2 (TTF)+ units along the c→p axis in the primitive triclinic cell. We use our quantitative measurement of the displacement magnitude (Δx=0.072) within the mean-field spin-Peierls model to show that the unrenormalized energy of the dimerization phonon is about 1 meV. This result is consistent with previous observations of preexisting soft modes in x-ray diffuse-scattering studies. Implications for the observation of this transition in other materials are discussed. © 1979 The American Physical Society.
引用
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页码:2341 / 2347
页数:7
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