Phase diagram of the one dimensional anisotropic Kondo-necklace model

Details Phase diagram of the one dimensional anisotropic Kondo-necklace model Phase diagram of the one dimensional anisotropic Kondo-necklace model

2007-12-23

arxiv.org/abs/0712.3914v2

Phys. Rev. B. 77, 24420 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages and 9 eps figures

Scientific paper

10.1103/PhysRevB.77.024420

The one dimensional anisotropic Kondo-necklace model has been studied by several methods. It is shown that a mean field approach fails to gain the correct phase diagram for the Ising type anisotropy. We then applied the spin wave theory which is justified for the anisotropic case. We have derived the phase diagram between the antiferromagnetic long range order and the Kondo singlet phases. We have found that the exchange interaction (J) between the itinerant spins and local ones enhances the quantum fluctuations around the classical long range antiferromagnetic order and finally destroy the ordered phase at the critical value, J_c. Moreover, our results show that the onset of anisotropy in the XY term of the itinerant interactions develops the antiferromagnetic order for J

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