Publications in Scientific Journals:

A. Grytsiv, E. Bauer, St Berger, G. Hilscher, H. Michor, C. Paul, P. Rogl, A. Daoud-Aladine, L. Keller, T. Roisnel, H. Noel:
"Novel Zn9-cluster compounds RE2Zn6Ge3 (RE: La, Ce, Pr, Nd, Sm, Gd): crystal structure and physical properties*";
Journal of Physics: Condensed Matter, 15 (2003), 3053 - 3067.

English abstract:
Novel Zn9-cluster compounds RE2Zn6Ge3 (RE: La, Ce, Pr, Nd, Sm, Gd): crystal structure and physical properties*
A Grytsiv1, E Bauer2, St Berger2, G Hilscher2, H Michor2, Ch Paul2, P Rogl1,5, A Daoud-Aladine3, L Keller3, T Roisnel4 and H Noel4
1 Institut für Physikalische Chemie, Universität Wien, A-1090 Wien, Währingerstraße 42, Austria
2 Institut für Festkörperphysik, TU Wien, A-1040 Wien, Wiedner Hauptstraße 8-10, Austria
3 Laboratorium für Neutronenstreuung, PSI & ETH, CH-5232 Villigen PSI, Switzerland
4 Laboratoire de Chemie du Solide et Inorganique Moléculaire, Université de Rennes I, UMR CNRS 6511, Avenue du Général Leclerc, F-35042 Rennes cedex, France

5 Author to whom any correspondence should be addressed.
E-mail: peter.franz.rogl@univie.ac.at
*Dedicated to Professor O Bodak on the occasion of her 60th birthday.

Received 20 January 2003, in final form 17 March 2003
Published 6 May 2003

Abstract. A novel ternary structure type has been determined from single crystals of Ce2Zn6Ge3 grown from indium?zinc flux solvent. The Ce2Zn6Ge3 type is hexagonal (a = 0.767 69(2) nm; c = 0.411 59(2) nm) with space group P [bar 6] 2m, Z = 1. Isotypic compounds with La, Pr, Nd, Sm and Gd were synthesized by reaction sintering, and their isotypic crystal structures were confirmed from Rietveld refinements. These novel ternaries show metallic behaviour and their ground state depends on the particular rare earth ion. Long-range magnetic order was deduced for the compounds from Ce to Gd, with a maximum transition temperature TN ~ 29 K for Gd2Zn6Ge3. While the compounds with Ce and Pr exhibit a spontaneous magnetic type of order, those with Nd, Sm and Gd are antiferromagnetic. The magnetic structures of Pr2Zn6Ge3 and Nd2Zn6Ge3 were resolved on the basis of neutron powder diffraction performed at 1.5 K.

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