Structural phase transition in the 2D spin dimer compound SrCu 2 ( BO 3 ) 2

Dzyaloshinski-Moriya interaction in the 2D spin gap system SrCu(2)(BO(3))(2).

The Dzyaloshinski-Moriya interaction partially lifts the magnetic frustration of the spin-1/2 oxide SrCu(2)(BO(3))(2). It explains the fine structure of the excited triplet state and its unusual magnetic field dependence, as observed in previous ESR and new neutron inelastic scattering experiments. We claim that it is mainly responsible for the dispersion. We propose also a new mechanism for th...

Cu nuclear spin - spin coupling in the dimer singlet state in SrCu 2 ( BO

We report results of nuclear magnetic resonance (NMR) experiments in SrCu 2 (BO 3) 2 , a quasi two-dimensional spin system with a singlet ground state. When magnetic field is applied along the c-axis, each of the quadrupole split Cu resonance lines splits further into four lines. The spin-echo intensity for some of the split lines oscillates against the separation time between π/2 and π rf-puls...

2 00 2 SrCu 2 ( BO 3 ) 2 : A Unique Mott Hubbard Insulator

Quantum spin systems are of great current interest, as shown by this symposium, with roots in two distinct sources. On the one hand the theory of model systems providing a rich variety of possibilities, and on the other, the field of synthetic materials, which has generated a vast number of systems, often close to theoretical models. As a result of this interplay, several interesting systems ha...

2 6 Se p 20 05 Collective Magnetic Excitations in SrCu 2 ( BO 3 ) 2

Various Series Expansions for a Heisenberg Antiferromagnet Model for Srcu 2 (bo 3 ) 2

We use a variety of series expansion methods at both zero and finite temperature to study an antiferromagnetic Heisenberg spin model proposed recently by Miyahara and Ueda for the quasi two-dimensional material SrCu 2 (BO 3) 2. We confirm that this model exhibits a first-order quantum phase transition at T = 0 between a gapped dimer phase and a gapless Néel phase when the ratio x = J ′ /J of ne...