SKEWED SPIRAL MAGNETIC-STRUCTURE IN ERMN6GE6

被引:30
作者
SCHOBINGERPAPAMANTELLOS, P
ANDRE, G
RODRIGUEZCARVAJAL, J
BUSCHOW, KHJ
机构
[1] CENS,CEA,CNRS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE
[2] UNIV AMSTERDAM,VAN DER WAALS ZEEMAN LAB,1018 XE AMSTERDAM,NETHERLANDS
关键词
SKEWED SPIRAL; MAGNETIC STRUCTURE; NEUTRON POWDER DIFFRACTION;
D O I
10.1016/0925-8388(94)05059-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
ErMn6Ge6 adopts the HfFe6Ge6-type structure and orders antiferromagnetically below T-N = 475 K. At T-t = 80 K it undergoes a first-order spin reorientation transition. Neutron powder diffraction has shown that the low temperature phase is a triple skewed spiral with wave vector q(1) = (0, 0, q(z)), consisting of three ferromagnetic Er and Mn layers Mn(z = -1/4)-Er(z = 0)-Mn(z = 1/4) with the Er moments orientated opposite to the line bisecting the Mn-Mn interplanar angle 2 phi(Mn) = 70 deg. The spiral axis makes a non-zero angle with q(1). The wavevector length is incommensurate with the crystal lattice and weakly temperature dependent. Below 70 K, q(z) locks in to the commensurate value 1/4. Above T-t= 80 K a decoupling of the Mn and Er sublattices sets in, and the skewed spiral structure is destabilized. In the transition region 80-160 K the magnetic ordering is described as a superposition of two Fourier coefficients per atom, associated with the wave vectors q(1) = (0, 0, q(z)) and q(2) = (0, 0, 1/2). The H+/-q(1) satellites (skewed spiral) comprise Er as well as Mn intensity contributions, while only the Mn antiferromagnetic ordering along c contributes to the H+/-q(2) satellites. Above 170 K one observes exclusively H+/-q(2) Mn intensity contributions.
引用
收藏
页码:176 / 180
页数:5
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