Contrasting magnetic behavior of fine particles of some Kondo lattices |
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| Authors: | K Mukherjee Kartik K Iyer EV Sampathkumaran |
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| Institution: | 1. The University of Queensland, Australian Institute for Bioengineering and Nanotechnology, St. Lucia QLD 4072, Australia;2. The University of Queensland, Queensland Alliance for Agriculture and Food Innovation, St. Lucia QLD 4072, Australia;1. School of Physics, Southeast University, Jiangning District, Nanjing 211189, People’s Republic of China;2. School of Chemistry and Chemical Engineering, Southeast University, Jiangning District, Nanjing 211189, People’s Republic of China;1. Department of Chemistry, Moscow State University, Leninskie Gory, House 1, Building 3, Moscow, GSP-1, 119991, Russia;2. Faculty of Materials Science, Moscow State University, Leninskie Gory, House 1, Building 73, Moscow, GSP-1, 119991, Russia;3. Department of Petrology, Geological Faculty Moscow State University, Leninskie Gory, Moscow 119991, Russia;4. Indian Institute of Technology Madras, Chennai 600036, India;5. Departamento de Física Teórica e Experimental, Universidade Federal do Rio Grande do Norte, Natal, 59082-970, Brazil;1. The Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China;2. University of Science and Technology of China, Hefei 230026, China;3. Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China;1. Department of Physics, Indian Institute of Technology, Kanpur 208016, India;2. Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc?aw, Poland |
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| Abstract: | We have investigated the magnetic behavior of ball-milled fine particles of well-known Kondo lattices, CeAu2Si2, CePd2Si2 and CeAl2, by magnetization and heat-capacity studies in order to understand the magnetic behavior when the particle size is reduced. These compounds have been known to order antiferromagnetically in the bulk form near () 10, 10 and 3.8 K respectively. We find that the features due to magnetic ordering get suppressed to temperatures below 1.8 K in the case of fine particles of ternary alloys, though trivalence of Ce as inferred from the effective moment remains unchanged. In contrast to this, in CeAl2, there appears to be a marginal enhancement of , when the particle size is reduced to less than a micron. These results can be consistently understood by proposing that these compounds move toward left in the Doniach magnetic phase-diagram, for instance, due to relatively more 4f-localization, as the particle size is reduced. |
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