Volume 103, Number 1, July 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||12 July 2013|
Magnetic fluctuations near the Mott transition towards a spin liquid state
1 Institut Néel, CNRS and UJF - B.P. 166, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France, EU
2 Department of Physics, Indian Institute of Technology - Chennai-600036, India
3 The Institute of Mathematical Sciences, C.I.T. Campus - Chennai-600113, India
4 Department of Physics, R. V. College of Engineering - Bangalore-560059, India
Received: 2 May 2013
Accepted: 18 June 2013
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.
PACS: 71.10.−w – / 71.30.+h – / 75.10.Kt –
© EPLA, 2013
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