Polarized-neutron study of one-dimensional magnetic response under magnetic field in the charge-ordered phase of Yb4As3

One-dimensional (1D) magnetic properties in the charge-ordered phase of Yb4 As3 has been studied by polarized-neutron diffraction, Field-induced magnet ic moment on the 1D Yb3+-ion chain under the field of 7T parallel to the ch ain behaves as that of the spin-1/2 ID Heisenberg antiferromagnet with g(pa rallel to) = 3.0. In the case of the field perpendicular to the chain, we o bserved not only the same behavior of induced moments with g(perpendicular to) similar or equal to 1.2 but also a remarkable enhancement below about 1 0K. The experimentally observed ID magnetization can be reproduced well by the theory based on Dzyaloshinskii-Moriya interaction inducing effective st aggered field by uniformly applied field. (C) 2001 Elsevier Science B.V. Al l rights reserved.