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L. Salamakha, O. Sologub, A. Riss, H. Michor, H. Müller, B. Stöger, G. Giester, P. Rogl, A. Sakai, P. Gegenwart, E. Bauer:
"Complex transport and magnetism of the ternary boride YbPt₅B₂";
Physical Review B, 105 (2022), 205112; S. 1 - 14.

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 T_mag1∼ 8 K and T_mag2∼ 4 K 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.

http://dx.doi.org/10.1103/PhysRevB.105.205112