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Article Dans Une Revue EPL - Europhysics Letters Année : 2013

Magnetic fluctuations near the Mott transition towards a spin liquid state

Serge Florens
Priyanka Mohan
  • Fonction : Auteur
C. Janani
  • Fonction : Auteur
T. Gupta
  • Fonction : Auteur

Résumé

Dynamics of magnetic moments near the Mott metal-insulator transition is investigated by a combined slave-rotor and Dynamical Mean-Field Theory solution of the Hubbard model with additional fully-frustrated random Heisenberg couplings. In the paramagnetic Mott state, the spinon decomposition allows to generate a Sachdev-Ye spin liquid in place of the collection of independent local moments that typically occurs in the absence of magnetic correlations. Cooling down into the spin-liquid phase, the onset of deviations from pure Curie behavior in the spin susceptibility is found to be correlated to the temperature scale at which the Mott transition lines experience a marked bending. We also demonstrate a weakening of the effective exchange energy upon approaching the Mott boundary from the Heisenberg limit, due to quantum fluctuations associated to zero and doubly occupied sites.
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Dates et versions

hal-01698266 , version 1 (12-02-2018)

Identifiants

Citer

Serge Florens, Priyanka Mohan, C. Janani, T. Gupta, R. Narayanan. Magnetic fluctuations near the Mott transition towards a spin liquid state. EPL - Europhysics Letters, 2013, 103 (1), pp.17002. ⟨10.1209/0295-5075/103/17002⟩. ⟨hal-01698266⟩

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