Floating zone crystal growth of selected R2PdSi3 ternary silicides

Y. Xu; M. Frontzek; I. Mazilu; W. Löser; G. Behr; B. Büchner; L. Liu

doi:10.1016/j.jcrysgro.2010.11.138

Floating zone crystal growth of selected R₂PdSi₃ ternary silicides

Y. Xu, M. Frontzek, I. Mazilu, W. Löser, G. Behr, B. Büchner, L. Liu

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11 Scopus citations

Abstract

Substitution of various rare earths R within the class of R ₂PdSi₃ single crystals with hexagonal AlB₂-type crystallographic structure reveals the systematic dependence of anisotropic magnetic properties governed by the interplay of crystal-electric field effects and magnetic two-ion interactions. Here we compare the floating zone (FZ) crystal growth with radiation heating of compounds with R=Tb, Tm, Pr and Gd. The congruent melting behavior enabled moderate growth velocities of 35 mm h ^-1. The composition of the crystals, except of Tb ₂PdSi₃, is slightly Pd-depleted with respect to the nominal concentration 16.7 at% Pd. Thin precipitates of RSi secondary phases were detected in the crystal matrix. Their phase fraction can be diminished by growth from appropriate feed rod compositions and/or annealing treatments. The compounds exhibit antiferromagnetic order below the Néel temperatures T_N: 23.6 K (Tb₂PdSi₃), 1.8 K (Tm ₂PdSi₃), 2.17 K (Pr₂PdSi₃) and 22 K (Gd₂PdSi₃) with different grades of magnetic anisotropy.

Original language	English
Pages (from-to)	942-946
Number of pages	5
Journal	Journal of Crystal Growth
Volume	318
Issue number	1
DOIs	https://doi.org/10.1016/j.jcrysgro.2010.11.138
State	Published - Mar 1 2011

Funding

The authors would like to express their gratitude to N. Wizent for assistance in crystal growth and X-ray experiments, A. Teresiak for X-ray phase analyses and S. Müller-Litvanyi and S. Pichl for their support in crystal characterization. The authors acknowledge the financial support by the China Scholarship Council File no. 2008629045 (Y.X.). Susceptibility measurements had been made using the facilities at the Institut für Festkörperphysik at the TU Dresden.

Keywords

A2. Floating zone technique
A2. Single crystal growth
B1. Rare earth compounds
B2. Magnetic materials

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10.1016/j.jcrysgro.2010.11.138

Cite this

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title = "Floating zone crystal growth of selected R2PdSi3 ternary silicides",

abstract = "Substitution of various rare earths R within the class of R 2PdSi3 single crystals with hexagonal AlB2-type crystallographic structure reveals the systematic dependence of anisotropic magnetic properties governed by the interplay of crystal-electric field effects and magnetic two-ion interactions. Here we compare the floating zone (FZ) crystal growth with radiation heating of compounds with R=Tb, Tm, Pr and Gd. The congruent melting behavior enabled moderate growth velocities of 35 mm h -1. The composition of the crystals, except of Tb 2PdSi3, is slightly Pd-depleted with respect to the nominal concentration 16.7 at% Pd. Thin precipitates of RSi secondary phases were detected in the crystal matrix. Their phase fraction can be diminished by growth from appropriate feed rod compositions and/or annealing treatments. The compounds exhibit antiferromagnetic order below the N{\'e}el temperatures TN: 23.6 K (Tb2PdSi3), 1.8 K (Tm 2PdSi3), 2.17 K (Pr2PdSi3) and 22 K (Gd2PdSi3) with different grades of magnetic anisotropy.",

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AU - Frontzek, M.

AU - Mazilu, I.

AU - Löser, W.

AU - Behr, G.

AU - Büchner, B.

AU - Liu, L.

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N2 - Substitution of various rare earths R within the class of R 2PdSi3 single crystals with hexagonal AlB2-type crystallographic structure reveals the systematic dependence of anisotropic magnetic properties governed by the interplay of crystal-electric field effects and magnetic two-ion interactions. Here we compare the floating zone (FZ) crystal growth with radiation heating of compounds with R=Tb, Tm, Pr and Gd. The congruent melting behavior enabled moderate growth velocities of 35 mm h -1. The composition of the crystals, except of Tb 2PdSi3, is slightly Pd-depleted with respect to the nominal concentration 16.7 at% Pd. Thin precipitates of RSi secondary phases were detected in the crystal matrix. Their phase fraction can be diminished by growth from appropriate feed rod compositions and/or annealing treatments. The compounds exhibit antiferromagnetic order below the Néel temperatures TN: 23.6 K (Tb2PdSi3), 1.8 K (Tm 2PdSi3), 2.17 K (Pr2PdSi3) and 22 K (Gd2PdSi3) with different grades of magnetic anisotropy.

AB - Substitution of various rare earths R within the class of R 2PdSi3 single crystals with hexagonal AlB2-type crystallographic structure reveals the systematic dependence of anisotropic magnetic properties governed by the interplay of crystal-electric field effects and magnetic two-ion interactions. Here we compare the floating zone (FZ) crystal growth with radiation heating of compounds with R=Tb, Tm, Pr and Gd. The congruent melting behavior enabled moderate growth velocities of 35 mm h -1. The composition of the crystals, except of Tb 2PdSi3, is slightly Pd-depleted with respect to the nominal concentration 16.7 at% Pd. Thin precipitates of RSi secondary phases were detected in the crystal matrix. Their phase fraction can be diminished by growth from appropriate feed rod compositions and/or annealing treatments. The compounds exhibit antiferromagnetic order below the Néel temperatures TN: 23.6 K (Tb2PdSi3), 1.8 K (Tm 2PdSi3), 2.17 K (Pr2PdSi3) and 22 K (Gd2PdSi3) with different grades of magnetic anisotropy.

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