Crystallography, magnetic susceptibility, heat capacity, and electrical resistivity of heavy-fermion LiV2O4 single crystals grown using a self-flux technique

TitleCrystallography, magnetic susceptibility, heat capacity, and electrical resistivity of heavy-fermion LiV2O4 single crystals grown using a self-flux technique
Publication TypeJournal Article
Year of Publication2007
AuthorsDas S, Zong X, Niazi A, Ellern A, Yan JQ, Johnston DC
Journal TitlePhysical Review B
Volume76
Pages054418
Date PublishedAug
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberISI:000249155100089
Keywordsbehavior, COMPOUND LIV2O4, frustration, liquid, SPINEL, THERMAL-EXPANSION, transition-metal oxide, TRANSPORT
Abstract

Magnetically pure spinel compound LiV2O4 is a rare d-electron heavy fermion. Measurements on single crystals are needed to clarify the mechanism for the heavy-fermion behavior in the pure material. In addition, it is known that small concentrations (< 1 mol %) of magnetic defects in the structure strongly affect the properties, and measurements on single crystals containing magnetic defects would help to understand the latter behaviors. Herein, we report flux growth of LiV2O4 and preliminary measurements to help resolve these questions. The magnetic susceptibility of some as-grown crystals show a Curie-like upturn at low temperatures, showing the presence of magnetic defects within the spinel structure. The magnetic defects could be removed in some of the crystals by annealing them at 700 degrees C. A very high specific heat coefficient gamma=450 mJ/mol K-2 was obtained at a temperature of 1.8 K for a crystal containing a magnetic defect concentration n(defect)=0.5 mol %. A crystal with n(defect)=0.01 mol % showed a residual resistivity ratio of 50.

DOI10.1103/PhysRevE.76.054418
Alternate JournalPhys. Rev. B