We review ground states and excitations of a quantum antiferromagnet on triangular and
other frustrated lattices. We pay special attention to the combined effects of magnetic field h …

We overview physical effects of exchange frustration and quantum spin fluctuations in (quasi-
) two dimensional (2D) quantum magnets (S= 1∕ 2) with square, rectangular and triangular …

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

We report the results of magnetization and specific heat measurements on Ba 3 CoSb 2 O 9,
in which the magnetic Co 2+ ion has a fictitious spin 1/2, and provide evidence that a spin …

We have performed high-field magnetization and electronic spin resonance (ESR)
measurements on Ba 3 CoSb 2 O 9 single crystals, which approximates the two-dimensional …

Polycrystalline samples of NaYbO 2 are investigated by bulk magnetization and specific-
heat measurements, as well as by nuclear magnetic resonance (NMR) and electron spin …

Abstract A spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) is a prototypical
frustrated quantum magnet, which exhibits remarkable quantum many-body effects that arise …

The magnetization of a quantum magnet can be pinned at a fraction of its saturated value by
collective effects. One example of such a plateau phase is found in spin-1/2 triangular-lattice …

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 …

Using magnetic, thermal, and neutron measurements on single-crystal samples, we show
that Ba 3 CoSb 2 O 9 is a spin-1/2 triangular-lattice antiferromagnet with the c axis as the …