Observation of the spin-Peierls transition in linear (spin-1/2) chains in an inorganic compound

M Hase, I Terasaki, K Uchinokura - Physical Review Letters, 1993‏ - APS
The magnetic susceptibility of single-crystal CuGeO 3, a linear Cu 2+(spin-1/2) chain
compound, was measured. The susceptibilities in all the directions rapidly drop to small …

Hidden symmetry breaking and the Haldane phase inS=1 quantum spin chains

T Kennedy, H Tasaki - Communications in mathematical physics, 1992‏ - Springer
We study the phase diagram of S= 1 antiferromagnetic chains with particular emphasis on
the Haldane phase. The hidden symmetry breaking measured by the string order parameter …

Crossover between the Haldane-gap phase and the dimer phase in the spin-1/2 alternating Heisenberg chain

K Hida - Physical Review B, 1992‏ - APS
The ground-state properties of the spin-1/2 Heisenberg chain, which has two exchange
couplings (J> J') alternatingly, are studied. This model interpolates the spin-1 …

Bose condensation in quasi-one-dimensional antiferromagnets in strong fields

I Affleck - Physical Review B, 1991‏ - APS
Recent experiments show that axially symmetric integer-spin antiferromagnetic chains
undergo a phase transition at a critical applied magnetic field. It was argued, using Landau …

Effect of the Haldane gap on quasi-one-dimensional systems

T Sakai, M Takahashi - Physical Review B, 1990‏ - APS
A quasi-one-dimensional S= 1 Heisenberg antiferromagnet with a single-ion anisotropy
Dtsum j (S jz) 2 is investigated. By treatment of interchain interactions with coupling constant …

Theory of Haldane-gap antiferromagnets in applied fields

I Affleck - Physical Review B, 1990‏ - APS
As first predicted by Haldane, and later observed in neutron-scattering experiments, one-
dimensional Heisenberg antiferromagnets of integer spin have an excitation gap. Recently …

Observation of fractional spin S=1/2 on open ends of S=1 linear antiferromagnetic chains: Nonmagnetic do**

SH Glarum, S Geschwind, KM Lee, ML Kaplan… - Physical review …, 1991‏ - APS
Abstract Approximately 0.5% of nonmagnetic divalent ions Zn, Cd, and Hg have been
alternatively substituted for Ni in the linear chain of antiferromagnetically coupled Ni 2+(S …

Quantum liquid in antiferromagnetic chains: A stochastic geometric approach to the Haldane gap

H Tasaki - Physical review letters, 1991‏ - APS
The S= 1 quantum antiferromagnetic chain with the Hamiltonian H= J i S ix S i+ 1 x+ S iy S i+
1 y+ λ S iz S i+ 1 z+ D (S iz) 2 is studied. By develo** a (path-integral-type) stochastic …

Magnetization Plateaus in NH_4CuCl_3

W Shiramura, K Takatsu, B Kurniawan… - Journal of the Physical …, 1998‏ - jstage.jst.go.jp
The magnetic susceptibility and high-field magnetization process of N la CuCl3 with double
chains of CuCl have been mcasured using single crystals. No anomaly indicative of the …

Inelastic-neutron-scattering study of the spin dynamics in the Haldane-gap system Ni(

LP Regnault, I Zaliznyak, JP Renard, C Vettier - Physical Review B, 1994‏ - APS
We have investigated the spin dynamics of the nearly ideal one-dimensional S= 1
antiferromagnet Ni (C 2 H 8 N 2) 2 NO 2 ClO 4 (NENP) by inelastic neutron scattering. The …