Magnetic susceptibility of the frustrated spinels ZnCr2O4, MgCr2O4and CdCr2O4

Spin-phonon coupling in antiferromagnetic chromium spinels

The temperature dependence of eigenfrequencies and intensities of the IR active modes has been investigated for the antiferromagnetic chromium spinel compounds CdCr2O4, ZnCr2O4, ZnCr2S4, ZnCr2Se4, and HgCr2S4 by IR spectroscopy for temperatures from 5 K to 300 K. At the transition into the magnetically ordered phases, and driven by spin-phonon coupling, most compounds reveal significant splitti...

Spin-lattice order in frustrated ZnCr2O4.

Using synchrotron x-ray and neutron diffraction, we disentangle spin-lattice order in highly frustrated ZnCr2O4 where magnetic chromium ions occupy the vertices of regular tetrahedra. Upon cooling below 12.5 K the quandary of antialigning spins surrounding the triangular faces of tetrahedra is resolved by establishing weak interactions on each triangle through an intricate lattice distortion. H...

Evolution of magnetic states in frustrated diamond lattice antiferromagnetic Co(Al1- xCox)(2)O-4 spinels

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 ...

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...