Magnetic correlations in a classic Mott system

Bao, Wan-Su; Broholm, C.; Aeppli, G.; Carter, S.A.; Dai, Pengcheng; Frost, C. D.; Honig, J.M.; Metcalf, P.

doi:10.1016/s0304-8853(97)00607-0

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…In metallic samples the geometry of the Fermi surface directly affects magnetic correlations, while in insulating samples there are low energy orbital degrees of freedom which are important for describing the unusual PI phase and the PI-AFI phase transition. Some of the above results were previously published in short reports [33][34][35][36][37][38][39].…”

Section: Introductionsupporting

confidence: 55%

Magnetic correlations and quantum criticality in the insulating antiferromagnetic, insulating spin liquid, renormalized Fermi liquid, and metallic antiferromagnetic phases of the Mott systemV2O3
Bao
¹
,
Broholm
²
,
Aeppli³
et al. 1998
Phys. Rev. B
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65
2
73
1
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Magnetic correlations in all four phases of pure and doped vanadium sesquioxide (V 2 O 3 ) have been examined by magnetic thermal-neutron scattering. Specifically, we have studied the antiferromagnetic and paramagnetic phases of metallic V 2Ϫy O 3 , the antiferromagnetic insulating and paramagnetic metallic phases of stoichiometric V 2 O 3 , and the antiferromagnetic and paramagnetic phases of insulating V 1.944 Cr 0.056 O 3 . While the antiferromagnetic insulator can be accounted for by a localized Heisenberg spin model, the long-range order in the antiferromagnetic metal is an incommensurate spin-density wave, resulting from a Fermi surface nesting instability. Spin dynamics in the strongly correlated metal are dominated by spin fluctuations with a ''single lobe'' spectrum in the Stoner electron-hole continuum. Furthermore, our results in metallic V 2 O 3 represent an unprecedentedly complete characterization of the spin fluctuations near a metallic quantum critical point, and provide quantitative support for the self-consistent renormalization theory for itinerant antiferromagnets in the small moment limit. Dynamic magnetic correlations for បϽk B T in the paramagnetic insulator carry substantial magnetic spectral weight. However, they are extremely short-ranged, extending only to the nearest neighbors. The phase transition to the antiferromagnetic insulator, from the paramagnetic metal and the paramagnetic insulator, introduces a sudden switching of magnetic correlations to a different spatial periodicity which indicates a sudden change in the underlying spin Hamiltonian. To describe this phase transition and also the unusual short-range order in the paramagnetic state, it seems necessary to take into account the orbital degrees of freedom associated with the degenerate d orbitals at the Fermi level in V 2 O 3 . ͓S0163-1829͑98͒06443-1͔

show abstract

Section: Introductionsupporting

confidence: 55%

Magnetic correlations and quantum criticality in the insulating antiferromagnetic, insulating spin liquid, renormalized Fermi liquid, and metallic antiferromagnetic phases of the Mott systemV2O3
Bao
¹
,
Broholm
²
,
Aeppli³
et al. 1998
Phys. Rev. B
Self Cite
65
2
73
1
View full text Add to dashboard Cite

show abstract

“…Such a sequence is observed for V 2 O 3 doped with Cr and for liquid 3 He (see figures 2 and 7). The inclusion of the antiferromagnetic phase requires more involved analysis, which will be skipped here [17,18] (see also [19] for evidence of antiferromagnetic orbital ordering). The most important factor is the sequence of transformations between localized and itinerant (liquid) states of the valence electrons as a function of temperature.…”

Section: Discontinuous Metal-insulator Transition At T >mentioning

confidence: 99%

Correlated fermions: a new paradigm in physics on the example of solid-state physics?

Spałek

2000

Eur. J. Phys.

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We review briefly the properties and provide an elementary theoretical description of correlated fermion systems, based mainly on the example of electronic systems undergoing metal-insulator (Mott-Hubbard) transition, which represents a transformation of electron gas (delocalized states) into atomic configuration with localized spins. The crystallization of liquid 3 He and the delocalization of nuclei into an extended system (neutron star) are also mentioned as two other examples. The characterization of the Mott-Hubbard transition as a quantum phase transformation is stressed. In such systems the localized (atomic) and delocalized (plane-wave-like) states can coexist when the transition is of a discontinuous nature, i.e. at non-zero temperature. We also discuss briefly other condensed fermionic systems such as heavy fermions, high-temperature superconductor systems, systems with a colossal magnetoresistance, and correlated quantum dots, in order to further illustrate the uniqueness of these systems among various Fermi liquids or magnetic semiconductors.

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Short-range order in strongly correlated Fermi systems

Kudasov¹

2003

Phys.-Usp.

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A mesh computational method for calculations of complex energy eigenvalues of quantum systems described by Schrödinger equations with non-separable spatial variables is developed. Complex eigenvalues of the energy are calculated for the ground state of the hydrogen atom and for a hydrogen-like system with a screened Coulomb interaction potential in strong electric fields by means of solving Schrödinger equations in cylindrical coordinates with the outgoing wave boundary condition. The method is also applied to the simplest diatomic molecule H + 2 . Complex eigenvalues of the energy E are calculated for the ground and two excited states of a H + 2 molecular ion in strong electric fields F directed along the molecular axis. The real parts of the energy and half-widths of a level are obtained as functions of the internuclear distance R. The equilibrium internuclear distance R 0 for the ground state of H + 2 is obtained as a function of F from F = 0 up to F = 0.065 au when a minimum on potential curve E(R) disappears. These results are in good agreement with experimental data on H + 2 in intense laser beam fields.

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Magnetic correlations in a classic Mott system

Abstract: O S T IThe metal-insulator transition in V~0 3 causes a fundamental change in its

Cited by 6 publications

References 33 publications

Correlated fermions: a new paradigm in physics on the example of solid-state physics?

Short-range order in strongly correlated Fermi systems

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Magnetic correlations in a classic Mott system

Abstract: O S T IThe metal-insulator transition in V~0 3 causes a fundamental change in its

Cited by 6 publications

References 33 publications

Magnetic correlations and quantum criticality in the insulating antiferromagnetic, insulating spin liquid, renormalized Fermi liquid, and metallic antiferromagnetic phases of the Mott systemV2O3Bao1, Broholm2, Aeppli3 et al. 1998Phys. Rev. BSelf Cite652731View full textAdd to dashboardCite

Magnetic correlations and quantum criticality in the insulating antiferromagnetic, insulating spin liquid, renormalized Fermi liquid, and metallic antiferromagnetic phases of the Mott systemV2O3Bao1, Broholm2, Aeppli3 et al. 1998Phys. Rev. BSelf Cite652731View full textAdd to dashboardCite

Correlated fermions: a new paradigm in physics on the example of solid-state physics?

Short-range order in strongly correlated Fermi systems

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