Complex transport and magnetism of the ternary boride YbPt₅B₂

Author(s)

Leonid P. Salamakha, O. Sologub, Alexander Riss, Herwig Michor, Herbert Müller, Berthold Stöger, Gerald Giester, Peter Franz Rogl, Akito Sakai, P Gegenwart, E. Bauer

Abstract

Novel ternary platinum borides YbPt5B2 and LuPt5B2 have been synthesized by arc melting of constituent elements and subsequent annealing at 1020 K. The unit cell of YbPt5B2 [YbPt5B2 type, monoclinic space group C2/m, a=15.4982(6)Å, b=5.5288(3)Å, c=5.5600(3)Å, β=105.367(3)∘, single-crystal x-ray diffraction data] is composed of two structural fragments alternating along the a axis and extending infinitively along the b axis: (i) columns of face-fused, boron-filled, and empty edge-connected trigonal metal prisms, and (ii) zigzag chains of B-filled trigonal prisms connected by common edges. LuPt5B2 was found to be isotypic (Rietveld refinement of powder x-ray diffraction data). YbPt5B2 exhibits two magnetic phase transitions at Tmag1∼8K and Tmag2∼4K as deduced from specific heat, magnetostriction, electric resistivity, and magnetization data. The Kadowaki-Woods ratio of 1.22×10-5μωcm(molK/mJ)2 classifies YbPt5B2 as a heavy fermion system. A magnetic phase diagram was established, using magnetostriction and magnetoresistance data. Nonmagnetic LuPt5B2 is characterized by a simple metallic behavior.

Organisation(s)

Department of Mineralogy and Crystallography, Department of Materials Chemistry

External organisation(s)

Universität Augsburg, Technische Universität Wien, Ivan Franko National University of Lviv

Journal

Physical Review B

Volume

105

No. of pages

14

ISSN

2469-9950

DOI

https://doi.org/10.1103/PhysRevB.105.205112

Publication date

05-2022

Peer reviewed

Yes

Austrian Fields of Science 2012

105116 Mineralogy, 104011 Materials chemistry, 105113 Crystallography, 202014 Electromagnetism

Keywords

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, Condensed Matter Physics

Portal url

https://ucrisportal.univie.ac.at/en/publications/befaf20a-5204-4b8e-b272-eb50bee930e8