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Title: Magnetic structures of Pr1-xLuxMn2Ge2 compounds (x=0.2 and 0.4)
Authors: Wang, JL
Studer, AJ
Campbell, SJ
Kennedy, SJ
Zeng, R
Dou, SX
Keywords: Magnetization
Phase transformations
OPAL Reactor
Ferromagnetic materials
Temperature range
Crystal lattices
Issue Date: 1-Feb-2011
Publisher: Australian Institute of Physics
Citation: Wang, J. L., Studer, A. J., Campbell, S. J., Kennedy, S. J., Zeng, R., Dou, S. X. (2011). Magnetic structures of Pr1-xLuxMn2Ge2 compounds (x=0.2 and 0.4). Paper presented to the Australian and New Zealand Institutes of Physics 35th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 2nd - 4th February, 2011. Retrieved from:
Abstract: Following our previous investigation of magnetic phase transitions in Pr1-xLuxMn2Ge2 [1], the magnetic structures of Pr1-xLuxMn2Ge2 (x=0.2; 0.4) have been investigated over the temperature range (10-450 K) using the high intensity diffractometer Wombat at OPAL. Four magnetic transitions have each been detected for both Pr0.8Lu0.2Mn2Ge2 and Pr0.6Lu0.4Mn2Ge2. The behaviour of successive magnetic transitions and structures is governed by the critical interplay of the lattice dimensions of the bct structure and interlayer and intralayer exchange interactions; here we present an overview of the effect of replacing Pr atoms with smaller Lu atoms leading to a complex series of magnetic states. With decreasing temperature, Pr0.8Lu0.2Mn2Ge2 first changes from paramagnetic (PM) to intralayer antiferromagnetism (AFl) at TN intra∼397 K and then to canted ferromagnetic ordering (Fmc) below TC inter ∼ 330 K. A transition from Fmc to the lower temperature conical spin structure (Fmi) occurs at Tc/c∼192 K. On further reduction in temperature, the transition at TC Pr=35 K (with related enhancement in magnetization) is assigned to the additional ferromagnetic contribution of the Pr sublattice, leading to Fmc+F(Pr) with the combination of ordering in the Mn and Pr sublattices. By comparison, for Pr0.6Lu0.4Mn2Ge2, the transition from PM to intralayer AFl occurs at TN intra∼375 K while the canted Fmc state starts to form at TC inter ∼ 321 K. With further decrease in temperature, Pr0.6Lu0.4Mn2Ge2 changes from Fmc to canted antiferromagnetic ordering (AFmc) at TN inter∼ 172 K. The final re-entrant ferromagnetic state (Fmc+F(Pr) takes place at TC Pr ∼31 K.
ISBN: 978-0-646-55969-8
Appears in Collections:Conference Publications

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