Phase separation and frustrated square lattice magnetism of Na1.5VOPO4F0.5

Nematic order in square lattice frustrated ferromagnets.

We present a new scenario for the breakdown of ferromagnetic order in a two-dimensional quantum magnet with competing ferromagnetic and antiferromagnetic interactions. In this, dynamical effects lead to the formation of two-magnon bound states, which undergo Bose-Einstein condensation, giving rise to bond-centered nematic order. This scenario is explored in some detail for an extended Heisenber...

Weak quasistatic magnetism in the frustrated Kondo lattice Pr2Ir2O7

Muon spin relaxation experiments have been performed in the pyrochlore iridate Pr2Ir2O7 for temperatures in the range 0.025– 250 K. Kubo-Toyabe relaxation functions are observed up to & 200 K, indicating static magnetism over this temperature range. The T → 0 static muon spin relaxation rate ∆(0) ≈ 8 μs implies a weak quasistatic moment (∼0.1μB). The temperature dependence of ∆ is highly non-me...

Frustrated magnetism and cooperative phase transitions in spinels

1Department of Physics, University of Virginia, Charlottesville, VA 22904, USA Advanced Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan 3Department of Advanced Materials, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan 4Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan 5The Institute for Solid State Physics...

Third-order magnetic susceptibility of the frustrated square-lattice antiferromagnet

We present results from our analysis of the finite-temperature properties of the spin 1/2 J1-J2 Heisenberg model on a square lattice. The analysis is based on the exact diagonalization of small clusters with 16 and 20 sites utilizing the finite-temperature Lanczos method. In particular, we focus on the temperature dependence of the third-order magnetic susceptibility as a method to resolve the ...

Spin liquids and frustrated magnetism