Weak Ferromagnetic Exchange and Anomalous Specific Heat in ZnCu3(OH)6Cl2

Details Weak Ferromagnetic Exchange and Anomalous Specific Heat in ZnCu3(OH)6Cl2 Weak Ferromagnetic Exchange and Anomalous Specific Heat in ZnCu3(OH)6Cl2

2008-01-14

arxiv.org/abs/0801.2138v2

Phys. Rev. Lett. 101, 027204 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, some clarifications to the text

Scientific paper

10.1103/PhysRevLett.101.027204

Experimental evidence for a plethora of low energy spin excitations in the spin-1/2 kagome antiferromagnet ZnCu3(OH)6Cl2 may be understandable in terms of an extended Fermi surface of spinons coupled to a U(1) gauge field. We carry out variational calculations to examine the possibility that such a state may be energetically viable. A Gutzwiller-projected wavefunction reproduces the dimerization of a kagome strip found previously by DMRG. Application to the full kagome lattice shows that the inclusion of a small ferromagnetic next-nearest-neighbor interaction favors a ground state with a spinon Fermi surface.

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