Magnetic structure of iron-doped UPd2Ge2 |
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Authors: | A M Balagurov V V Sikolenko I S Lyubutin G Andre F Bouree H M Duh |
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Institution: | (1) Laboratory of Neutron Physics, Joint Institute of Nuclear Research, 141980 Dubna, Russia;(2) Institute of Crystallography, Russian Academy of Sciences, 117333 Moscow, Russia;(3) Laboratoire Leon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-sur-Yvette, France;(4) Department of Physics, National Kaohsiung Normal University, Kaohsiung, Taiwan, 802 |
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Abstract: | Neutron diffraction investigations have shown that a 2% substitution Fe atoms for Pd radically alters the magnetic structure
of UPd2Ge2. If the magnetic structure in the undoped compound at T>50 K consists of a longitudinal spin density wave (LSDW) with “square” modulation, then in polycrystalline U(Pd0.98Fe0.02)2Ge2 a “simple” antiferromagnetic (AF) phase is observed below 65 K and a sinusoidally modulated LSDW-AF phase is observed between
65 K and the Neel temperature T
N
=135 K. In the interval 65> T>135 K the magnetic cell is incommensurate with the crystal cell, with the exception of the point T=93 K, where the wave vector of the magnetic structure passes through a “commensurate” value equal to 0.75. Below T
N
the magnetic moments of the uranium atoms are always parallel to the tetragonal axis c of the unit cell.
Pis’ma Zh. éksp. Teor. Fiz. 66, No. 9, 615–619 (10 November 1997) |
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