BACKGROUND Years ago, Lev Landau taught us how to think about distinct phases of
matter through an order parameter that characterizes the symmetry-broken state relative to …

This is an introductory review of the physics of quantum spin liquid states. Quantum
magnetism is a rapidly evolving field, and recent developments reveal that the ground states …

High-quality single crystals of NaYbSe 2, which resembles a perfect triangular-lattice
antiferromagnet without intrinsic disorder, are investigated by magnetization and specific …

Emergent quasiparticles with a Dirac dispersion in condensed matter systems can be
described by the Dirac equation for relativistic electrons, in analogy with Dirac particles in …

Low energy inelastic neutron scattering on single crystals of the kagome spin-liquid
compound ZnCu 3 (OD) 6 Cl 2 (herbertsmithite) reveals antiferromagnetic correlations …

A quantum spin liquid state has long been predicted to arise in spin-1/2 Heisenberg square-
lattice antiferromagnets at the boundary region between Néel (nearest-neighbor interaction …

A recent focus of quantum spin liquid (QSL) studies is how disorder/randomness in a QSL
candidate affects its true magnetic ground state. The ultimate question is whether the QSL …

The discovery of magnetism by the ancient Greeks was enabled by the natural occurrence of
lodestone–a magnetized version of the mineral magnetite. Nowadays, natural minerals …

The cradle of quantum spin liquids, triangular antiferromagnets show strong proclivity to
magnetic order and require deliberate tuning to stabilize a spin-liquid state. In this brief …

We demonstrate that the single crystal of YCu 3 [OH (D)] 6.5 Br 2.5 (YCOB) is a kagome
Heisenberg antiferromagnet without evident orphan spins (≪ 0.8%). The site mixing …