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Magnetic, thermal, and transport properties of the mixed-valent vanadium oxides LuV4O8 and YV4O8

TitleMagnetic, thermal, and transport properties of the mixed-valent vanadium oxides LuV4O8 and YV4O8
Publication TypeJournal Article
Year of Publication2010
AuthorsDas S, Niazi A, Mudryk Y, Pecharsky VK, Johnston DC
Journal TitlePhysical Review B
Volume81
Pages104432
Date Published03/01
ISBN Number1098-0121
Accession NumberISI:000276248700094
Keywordscalcium ferrite, CHAINS, crystal-structure, insulator transition, metal, parameters, phase-transition, susceptibility, system
Abstract

LV4O8(L=Yb,Y,Lu) compounds are reported to crystallize in a structure similar to that of the orthorhombic CaFe2O4 structure type and contain four inequivalent V sites arranged in zigzag chains. We confirm the structure and report the magnetic, thermal, and transport properties of polycrystalline YV4O8 and LuV4O8. A first-order-like phase transition is observed at 50 K in both YV4O8 and LuV4O8. The symmetry remains the same with the lattice parameters changing discontinuously. The structural transition in YV4O8 leads to partial dimerization of the V atoms resulting in a sudden sharp drop in the magnetic susceptibility. The V spins that do not form dimers order in a canted antiferromagnetic state. The magnetic susceptibility of LuV4O8 shows a sharp peak at similar to 50 K. The magnetic entropies calculated from heat capacity versus temperature measurements indicate bulk magnetic transitions below 90 K for both YV4O8 and LuV4O8.
URL<Go to ISI>://000276248700094