ACTA

Neutron Diffraction Studies of Tb₂Ni_2-xIn Intermetallic Compounds

A. Szytuła^a, S. Baran^a, A. Hoser^b, Ya.M. Kalychak^c, B. Penc^a and Yu. Tyvanchuk^c
^aM. Smoluchowski Institute of Physics, Jagiellonian University, W.S. Reymonta 4, 30-059 Kraków, Poland
^bHelmholtz-Zentrum Berlin für Materialen und Energie GmbH, Hahn-Meitner Pl. 1, D-14 109 Berlin, Germany
^cAnalytical Chemistry Department, Ivan Franko National University of Lviv, Kyryla and Mephodiya, 679005 Lviv, Ukraine

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The magnetic ordering of the Tb₂Ni_1.78In and Tb₂Ni₂In have been studied by neutron diffraction measurements. Tb₂Ni_1.78In with the tetra-gonal Mo₂FeB₂-type (space group P4/mbm, tP10) is antiferromagnet with the Néel temperature equal to 20 K. Below this temperature Tb moments form: collinear magnetic structure commensurate with the crystal, described by the propagation vectors equal to (1/4, 1/4, 1/2). Magnetic moment equal to 7.60(6) μ_B is parallel to c-axis. The Tb₂Ni₂In in the orthorhombic Mn₂ lB₂-type (space group Cmmm, oC10) was detected as an impurity in the studied sample. It orders antiferromagnetically below ≈ 100 K with collinear moment arrangement described by the propagation vector (1/2, 1/2, 1/2). t 1.6 K μ_Tb = 6.33(14) μ_B and is parallel to the c-axis.

DOI: 10.12693/APhysPolA.124.994
PACS numbers: 75.25.-j, 75.47.Np, 75.50.Ee