Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-03-17
Phys. Rev. B 78, 144418 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
14 pages revtex, revised phase diagram, references added
Scientific paper
10.1103/PhysRevB.78.144418
We investigate theoretically the phase diagram of a classical Heisenberg antiferromagnet on the pyrochlore lattice perturbed by a weak second-neighbor interaction J_2. The huge ground state degeneracy of the nearest-neighbor Heisenberg spins is lifted by J_2 and a magnetically ordered ground state sets in upon approaching zero temperature. We have found a new, partially ordered phase with collinear spins at finite temperatures for a ferromagnetic J_2. In addition to a large nematic order parameter, this intermediate phase also exhibits a layered structure and a bond order that breaks the sublattice symmetry. Thermodynamic phase boundaries separating it from the fully disordered and magnetically ordered states scale as 1.87 J_2 S^2 and 0.26 J_2 S^2 in the limit of small J_2. The phase transitions are discontinuous. We analytically examine the local stability of the collinear state and obtain a boundary T ~ J_2^2/J_1 in agreement with Monte Carlo simulations.
Chern Gia-Wei
Moessner Richhild
Tchernyshyov Oleg
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