Atomic disorder in Gd2Zr2O7 pyrochlore

Quantum disorder in the two-dimensional pyrochlore Heisenberg antiferromagnet

We present the results of an exact diagonalization study of the spin-1/2 Heisenberg antiferromagnet on a two-dimensional version of the pyrochlore lattice, also known as the square lattice with crossings or the checkerboard lattice. Examining the low energy spectra for systems of up to 24 spins, we find that all clusters studied have non-degenerate ground states with total spin zero, and big en...

Structural disorder and properties of the stuffed pyrochlore Ho2TiO5

G. C. Lau,1,* R. S. Freitas,2,† B. G. Ueland,2 M. L. Dahlberg,2 Q. Huang,3 H. W. Zandbergen,4 P. Schiffer,2 and R. J. Cava1 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA 2Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA 3NIST Center for Neutron Research, NIST, Gaithersburg, Maryland...

Cooling Atomic Gases With Disorder.

Cold atomic gases have proven capable of emulating a number of fundamental condensed matter phenomena including Bose-Einstein condensation, the Mott transition, Fulde-Ferrell-Larkin-Ovchinnikov pairing, and the quantum Hall effect. Cooling to a low enough temperature to explore magnetism and exotic superconductivity in lattices of fermionic atoms remains a challenge. We propose a method to prod...

Ising Like Order by Disorder In The Pyrochlore Antiferromagnet with Dzyaloshinskii-Moriya Interactions

Order by disorder spin wave gap in the XY pyrochlore magnet Er2Ti2O7.

The recent determination of a robust spin Hamiltonian for the antiferromagnetic XY pyrochlore Er2Ti2O7 reveals a most convincing case of the "Order-by-Quantum-Disorder" mechanism for ground state selection. This mechanism relies on quantum fluctuations to remove an accidental symmetry of the magnetic ground state, and selects a particular ordered spin structure below TN=1.2 K. The removal of th...