Magnetic Susceptibilities of Metallic V2O3 Single Crystals

Abstract

The magnetic susceptibilities of single-crystal V2O3 have been measured by the Faraday method along and perpendicular to the trigonal axis between 300° and 700°K. Both χ‖ and χ⊥ have a high-temperature transition, as was expected, which occurs over a range of temperature from 450° to 550°K. An approximate fit of the data can be obtained with a Curie-Weiss law including a temperature-independent term with one set of parameters below 400°K and a different set above 550°K. It is found that the reciprocal susceptibility curve over the entire temperature range is at least cubic in T, indicating a rather complicated temperature dependence for the density of states function in the band approximation.

Mott-Hubbard Metal-Insulator Transition in ParamagneticV2O3: AnLDAHeld1, Keller2, Eyert3 et al. 2001Phys. Rev. Lett.254162610View full textAdd to dashboardCite

“…Thus we conclude that the spin state of V 2 O 3 is S = 1 throughout the Mott-Hubbard transition region. This agrees with the measurements of Park et al [9] and also with the data for the high-temperature susceptibility [27]. The latter correspond to an effective magnetic moment µ ef f = 2.66µ B which is close to the ideal value µ ef f = 2.83µ B for S = 1.…”

Realistic investigations of correlated electron systems with LDA + DMFT

“…From our calculations [48], we conclude that the spin state of 2 3 V O is 1 S = throughout the Mott-Hubbard transition region. This agrees with the measurements of Park et al [96] and also with the data for the high-temperature susceptibility [97]. But, it is at odds with the 1/2 S = model by Castellani et al [98] and with the results [99] for a one-band Hubbard model which corresponds to 1/2 S = in the insulating phase and, contrary to our results, shows a substantial change of the local magnetic moment at the MIT [90].…”

Electronic structure of paramagneticV2O3: Strongly correlated metallic and Mott insulating phase

“…This value corresponds to two spin-aligned electrons in the (a 1g , e π g1 , e π g2 ) orbitals and therefore to a spin-1 state in the Mott-Hubbard transition regime in good agreement with polarization dependent x-ray absorption measurements of Park et al 37 It also agrees with measurements of the high temperature susceptibility which give the value of µ ef f = 2.66µ B for the effective magnetic moment. 60 This is close to the ideal S = 1 value µ ef f = 2.83µ B . Note that when U is reduced to U < 3, the Hund's rule coupling J needs to be reduced as well to avoid an unphysical attractive Coulomb interaction (namely, a Coulomb energy U −3J < 0 would otherwise be gained when a spin-aligned electron is added to a singly occupied site).…”