ACTA

Structural Chemistry and Magnetic Properties of R₂Ni_2-xIn (R = Gd-Er, x=0.22 or 0.3) Compounds

Yu. Tyvanchuk^a, S. Baran^b, T. Jaworska-Gołąb^b, R. Duraj^c, Ya.M. Kalychak^a and A. Szytuła^b
^aAnalytical Chemistry Department, Ivan Franko National University of Lviv, Kyryla and Mephodiya 6, Lviv 79005, Ukraine
^bM. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
^cInstitute of Physics, Technical University of Cracow, Podchorążych 1, 30-084 Kraków, Poland

Received: September 22, 2011; In final form January 9, 2012

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X-ray diffraction and magnetic measurements of R₂Ni_{2 - x}In (R = Ho, Dy, x = 0.3 and R = Gd, Tb, Er, x = 0.22) compounds are reported. The compounds crystallize in the tetragonal Mo₂FeB₂-type crystal structure (space group P4/mbm). Magnetic measurements reveal antiferromagnetic order with the Néel temperatures T_N equal to 26.4 K (Gd), 20.2 K (Tb), 8.3 K (Dy), 7.1 K (Ho), and 6.3 K (Er). For R = Gd, Tb and Er an additional phase transition below T_N is observed at 13.5, 13.1, and 5.0 K, respectively.

DOI: 10.12693/APhysPolA.121.678
PACS numbers: 75.30.Cr, 75.30.Kz, 61.10.-i, 61.66.Dk, 75.40.Gb, 75.50.Ee