Magnetic Phase Diagram of a 2D $XY$ Model with Random Easy Axis OrientationMagnetic Phase Diagram of a 2D $XY$ Model with Random Easy Axis Orientation

Donald Priour

Bulletin of the American Physical SocietyOct 25, 20140 citations

Phase diagram of an anisotropic frustrated ferromagnetic spin- 12 chain in a magnetic field: A density matrix renormalization group study

Fabian Heidrich‐Meisner, Ian P. McCulloch, Alexei K. Kolezhuk

We study the phase diagram of a frustrated spin- $\frac{1}{2}$ ferromagnetic chain with anisotropic exchange interactions in an external magnetic field using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency toward multimagnon bound states while an easy-plane anisotropy favors chirally ordered phases. In particular, a moderate easy-plane anisotropy gives rise to a quantum phase transition at intermediate magnetization. We argue that this transition is related to the finite-field phase transition experimentally observed in the spin- $\frac{1}{2}$ compound ${\text{LiCuVO}}_{4}$ .We study the phase diagram of a frustrated spin-$\frac{1}{2}$ ferromagnetic chain with anisotropic exchange interactions in an external magnetic field using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency toward multimagnon bound states while an easy-plane anisotropy favors chirally ordered phases. In particular, a moderate easy-plane anisotropy gives rise to a quantum phase transition at intermediate magnetization. We argue that this transition is related to the finite-field phase transition experimentally observed in the spin-$\frac{1}{2}$ compound ${\text{LiCuVO}}_{4}$.

arXiv:0908.1281Physical Review BOct 20, 200971 citations

Quantum criticality in ``easy-plane'' SU(

N

) spin model

Deconfined criticality in "easy-plane" SU(

N

) anti-ferromagnets

Magnetic Phase Diagram of a 2D

XY

Model with Random Easy Axis Orientation

We study the phase diagram of a frustrated spin-

\frac{1}{2}

ferromagnetic chain with anisotropic exchange interactions in an external magnetic field using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency toward multimagnon bound states while an easy-plane anisotropy favors chirally ordered phases. In particular, a moderate easy-plane anisotropy gives rise to a quantum phase transition at intermediate magnetization. We argue that this transition is related to the finite-field phase transition experimentally observed in the spin-

\frac{1}{2}

compound

{\text{LiCuVO}}_{4}