Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-24
Phys. Rev. B 81, 104432 (2010); 11 pages
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages, 13 figures, 5 tables; submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.81.104432
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 discontinously. 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 ~ 50 K. The magnetic entropies calculated from heat capacity versus temperature measurements indicate bulk magnetic transitions below 90 K for both YV4O8 and LuV4O8.
Das Sourin
Johnston David C.
Mudryk Ya.
Niazi Asad
Pecharsky V. K.
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