X-ray evidence of charge density wave modulations in the magnetic phases of (TMTSF)(2)PF6 and (TMTTF)(2)Br

被引：126

作者：

Pouget, JP

Ravy, S

机构：

来源：

SYNTHETIC METALS | 1997年 / 85卷 / 1-3期

关键词：

organic superconductors; magnetic phase transitions; structural phase transitions; X-ray diffraction; electron density;

D O I：

10.1016/S0379-6779(97)80332-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed X-ray scattering investigations of (TMTSF)(2)PF6 and (TMTTF)(2)Br in their magnetic ground states. Very weak 2k(F) and 4k(F) satellite reflections are observed in the spin density wave (SDW) ground state of (TMTSF)(2)PF6. They are probably the signature of a purely electronic charge density wave (CDW) modulation of about one tenth of electron per molecule. Our X-ray results together with magnetic measurements show that the ground state of (TMTSF)(2)PF6 will exhibit an unprecedented 2k(F) mixed CDW-SDW modulation. 4k(F) satellite reflections are observed in the antiferromagnetic (AF) ground state of (TMTTF)(2)Br. In this salt the 4k(F) CDW modulation is probably set by magnetoelastic coupling of the lattice degrees of freedom with the AF modulation.

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页码：1523 / 1528

页数：6

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