Proposed low-energy model Hamiltonian for the spin-gapped system CuTe2O5

Das, Hena ; Saha-Dasgupta, Tanusri ; Gros, Claudius ; Valenti, Roser (2008) Proposed low-energy model Hamiltonian for the spin-gapped system CuTe2O5 Physical Review B: Condensed Matter and Materials Physics, 77 (22). 224437_1-224437_8. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v77/i22/e224437

Related URL: http://dx.doi.org/10.1103/PhysRevB.77.224437

Abstract

Using first-principles electronic structure calculations based on the Nth order muffin-tin orbital (NMTO)-downfolding technique, we derived the low-energy spin model for CuTe2O5. Our study reveals that this compound is a two-dimensional coupled spin-dimer system with the strongest Cu-Cu interaction mediated by two O-Te-O bridges. We checked the validity of our model by computing the magnetic susceptibility with quantum Monte Carlo technique and comparing it with available experimental data. We also present magnetization and specific-heat results which may be compared with future experimental investigations. Our derived model provides an alternative scenario to a recently proposed model for this compound Phys. Rev. B 74 174421 (2006). The situation needs to be settled in terms of further experimental investigations.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:65087
Deposited On:15 Oct 2011 11:59
Last Modified:15 Oct 2011 11:59

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