Ising model with periodic pinning of mobile defects

Holtschneider, M.; Selke, W.

doi:10.1103/physreve.68.026120

Cited by 14 publications

(27 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is theoretically predicted that in two-dimensional Ising system with mobile defects finite sized clusters are formed. 30,31 With more hole-doping the magnetic correlations along the chain change from being ferromagnetic to antiferromagnetic 8,13,14,23 and a dimerized state finally appears. 14,15,16 There might be a drastic change in magnetic interactions above x=1.7 probably driven by a charge ordering as in the Sr 14 Cu 24 O 41 system.…”

Section: Discussionmentioning

confidence: 99%

Effects of hole doping on magnetic ground and excited states in the edge-sharingCuO2chains ofCa2<

et al. 2005

View full text Add to dashboard Cite

Neutron scattering experiments were performed on the undoped and hole-doped Ca2+xY2−xCu5O10, which consists of ferromagnetic edge-sharing CuO2 chains. It was previously reported that in the undoped Ca2Y2Cu5O10 there is an anomalous broadening of spin-wave excitations along the chain, which is caused mainly by the antiferromagnetic interchain interactions [Matsuda et al., Phys. Rev. B 63, 180403(R) (2001)]. A systematic study of temperature and hole concentration dependencies of the magnetic excitations shows that the magnetic excitations are softened and broadened with increasing temperature or doping holes irrespective of Q direction. The broadening is larger at higher Q. A characteristic feature is that hole-doping is much more effective to broaden the excitations along the chain. It is also suggested that the intrachain interaction does not change so much with increasing temperature or doping although the anisotropic interaction and the interchain interaction are reduced. In the spin-glass phase (x=1.5) and nearly disordered phase (x=1.67) the magnetic excitations are much broadened in energy and Q. It is suggested that the spin-glass phase originates from the antiferromagnetic clusters, which are caused by the hole disproportionation.

show abstract

Section: Discussionmentioning

confidence: 99%

Effects of hole doping on magnetic ground and excited states in the edge-sharingCuO2chains ofCa2<

et al. 2005

View full text Add to dashboard Cite

show abstract

“…At low temperatures, the stripes stay close to the pinning lines and longrange antiferromagnetic order is observed. The transition remains to be of first order, driven, again, by the enhanced pairing of defects [6].…”

Section: Ising Model With Mobile Defectsmentioning

confidence: 92%

“…Assuming J and J0 to be large compared to |Ja|, one arrives at a 'minimal version' of the model, where spins along a chain have the same sign between two defects, reversing sign at a defect. The only relevant energy parameter is Ja [5,6].…”

Section: Ising Model With Mobile Defectsmentioning

confidence: 99%

See 1 more Smart Citation

Ising and anisotropic Heisenberg magnets with mobile defects

Holtschneider¹,

Leidl²,

Selke³

2005

Journal of Magnetism and Magnetic Materials

Self Cite

View full text Add to dashboard Cite

Motivated by experiments on (Sr,Ca,La)14Cu24O41, a two-dimensional Ising model with mobile defects and a twodimensional anisotropic Heisenberg antiferromagnet have been proposed and studied recently. We extend previous investigations by analysing phase diagrams of both models in external fields using mainly Monte Carlo techniques. In the Ising case, the phase transition is due to the thermal instability of defect stripes, in the Heisenberg case additional spin-flop structures play an essential role.

show abstract

“…Pertinent experimental findings [1][2][3][4] motivated recent theoretical studies on two-dimensional Ising antiferromagnets with defects [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%