Synthesis, characterization, and magnetic susceptibility of the heavy-fermion transition-metal oxide LiV{sub 2}O{sub 4}

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.2609· OSTI ID:302896

Kondo, S; Johnston, D C; Miller, L L ^[1]

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1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)

The preparative method, characterization, and magnetic susceptibility {chi} measurements versus temperature {ital T} of the heavy-fermion transition-metal oxide LiV{sub 2}O{sub 4} are reported in detail. The intrinsic {chi}(T) shows a nearly {ital T}-independent behavior below {approximately}30 K with a shallow broad maximum at {approx}16 K, whereas Curie-Weiss-like behavior is observed above {approximately}50{endash}100 K. Field-cooled and zero-field-cooled magnetization M{sup obs} measurements in applied magnetic fields H=10{minus}100 G from 1.8 to 50 K showed no evidence for spin-glass ordering. Crystalline electric field theory for an assumed cubic V point group symmetry is found insufficient to describe the observed temperature variation of the effective magnetic moment. The Kondo and Coqblin-Schrieffer models do not describe the magnitude and {ital T} dependence of {chi} with realistic parameters. In the high-T range, fits of {chi}(T) by the predictions of high-temperature series expansion calculations provide estimates of the V-V antiferromagnetic exchange coupling constant J/k{sub B}{approximately}20 K, {ital g} factor g{approximately}2, and the {ital T}-independent susceptibility. Other possible models to describe the {chi}(T) are discussed. The paramagnetic impurities in the samples were characterized using isothermal M{sup obs}(H) measurements with 0{lt}H{le}5.5 T at 2{endash}6 K. These impurities are inferred to have spin S{sub imp}{approximately}3/2{endash}4, g{sub imp}{approximately}2, and molar concentrations of 0.01{endash}0.8{percent}, depending on the sample. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 302896
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 4 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRON CORRELATION
KONDO EFFECT
LITHIUM COMPOUNDS
LITHIUM OXIDES
MAGNETIC MOMENTS
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
SPIN GLASS STATE
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
TEMPERATURE RANGE 0013-0065 K
VANADIUM OXIDES