Magnetic and transport properties of RCr0.3Ge2 (R=Tb, Dy, Ho and Er) compounds |
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Authors: | A Gil D Kaczorowski A Hoser |
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Institution: | a Department of Mathematics and Natural Science, J. D?ugosz University Cz?stochowa, Armii Krajowej 13/15, 42-200 Cz?stochowa, Poland b Institute of Low Temperature and Structure Research, Polish Academy of Sciences, P.O. Box 1410, 50-950 Wroc?aw, Poland c M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland d BENSC, Helmholtz-Zentrum Berlin, Glienicker Str. 100, 14-109 Berlin, Germany |
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Abstract: | The magnetic and transport properties of ternary rare-earth chromium germanides RCr0.3Ge2 (R=Y and Tb-Er) have been determined. X-ray and neutron diffraction studies indicate that these compounds have the CeNiSi2-type structure (space group Cmcm) 1]. Magnetic measurements reveal the antiferromagnetic ordering below TN equal to 18.5 K (R=Tb), 11.8 K (Dy), 5.8 K (Ho) and 3.4 K (Er). From the neutron diffraction data the magnetic structures have been determined. For TbCr0.3Ge2 and DyCr0.3Ge2 at low temperatures the magnetic ordering can be described by two vectors k1=( ,0,0) and k2=( ,0, ), and k1′=( ,0,0) and k2′=( ,0, ), respectively. In HoCr0.3Ge2 and ErCr0.3Ge2 the ordering can be described by one propagation vector equal to ( , ,0) and (0,0,0.4187(2)), respectively. In DyCr0.3Ge2 some change in the magnetic ordering is observed at Tt=5.1 K. In temperature range from Tt to TN the magnetic ordering is given by one propagation vector k=( ,0,0). YCr0.3Ge2 is a Pauli paramagnet down to 1.72 K which suggests that in the entire RCr0.3Ge2 series the Cr atoms do not carry magnetic moments. All compounds studied exhibit metallic character of the electrical conductivity. The temperature dependencies of the lattice parameters reveal strong magnetostriction effect at the respective Nèel temperatures. |
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Keywords: | Rare-earth intermetallic compound Neutron diffraction Magnetic structure Electrical properties |
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