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Phys. Rev. B 72, 024446 (2005) [9 pages]

Magnetic ordering and spin-reorientation transitions in TbCo3B2

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Moshe Dubman*
Nuclear Research Centre—Negev, P.O. Box 9001, Beer-Sheva 84190, Israel and Department of Physics, Ben-Gurion University, P.O. Box 653, Beer-Sheva 84105, Israel

El’ad N. Caspi and Hanania Ettedgui
Nuclear Research Centre—Negev, P.O. Box 9001, Beer-Sheva 84190, Israel

Lukas Keller
Laboratory for Neutron Scattering, ETH Zürich and Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

Mordechai Melamud†
Israel Atomic Energy Commission, P.O. Box 7061, Tel Aviv 61070, Israel

Hagai Shaked
Department of Physics, Ben-Gurion University, P.O. Box 653, Beer-Sheva 84105, Israel

Received 28 February 2005; published 21 July 2005

The magnetic structure of the compound TbCo3B2 has been studied in the temperature range 1.5 K⩽T⩽300 K by means of neutron powder diffraction, magnetization, magnetic ac susceptibility, and heat capacity measurements. The compound is of hexagonal symmetry and is paramagnetic at 300 K, undergoes a magnetic Co-Co ordering transition at ∼170 K, and a second magnetic Tb-Tb ordering transition at ∼30 K. The latter induces a spin-reorientation transition, in which the magnetic axis rotates from the c axis toward the basal plane. Below this transition a symmetry decrease (γ magnetostriction) sets in, leading to an orthorhombic distortion of the crystal lattice. The crystal and magnetic structures and interactions and their evolution with temperature are discussed using a microscopic physical model.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.024446
DOI:
10.1103/PhysRevB.72.024446
PACS:
75.50.Cc, 61.12.Ld, 75.30.Gw, 75.30.Et

*Corresponding author: Moshe Dubman, Nuclear Research Centre—Negev, P. O. Box 9001, Beer-Sheva IL-84190, Israel. Telephone: +972-8-6567876; fax: +972-8-6567878; electronic address: dovman54@netvision.net.il

†Present address: CTBTO, Vienna International Center, P.O. Box 1200, Vienna 1400, Austria.

 
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