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Phase diagram of the easy-plane ferromagnetic-antiferromagnetic S=1 Heisenberg chain

Lihua Pan, Yu Cao, Bin Xi +1 more

Physica B Condensed MatterJul 20, 20170 citations

Comment on 'Ground-State Phase Diagram of the Spin-1/2 Ferromagnetic-Antiferromagnetic Alternating Heisenberg Chains with Anisotropy'

清美岡本, Kiyomi Okamoto

Jan 1, 19930 citations

Reentrance in the phase diagram of the quantum spin 1/2 anisotropic Heisenberg antiferromagnet

J. Ricardo de Sousa, Ijanı́lio G. Araújo

Physics Letters AAug 1, 200014 citations

XY Phase in the Ground State of the Spin-1/2 Anisotropic Alternating Heisenberg Chain

Kazuo Hida

The location of the XY phase in the ground-state phase diagram of the spin-1/2 anisotropic ferromagnetic-antiferromagnetic alternating Heisenberg chain is determined. This model reduces to the spin-1 XXZ chain if the ferromagnetic bond is infinitely strong. The phase boundary between the XY phase and the Haldane phase is determined from the analysis of the numerically obtained energy spectrum of finite-sized systems with the open boundary condition. Our results are consistent with the series-expansion results by Yamanaka et al . within their error bars. The boundary between the ferromagnetic phase and the XY phase is also determined by comparing the energy eigenvalues of these two phases.The location of the XY phase in the ground-state phase diagram of the spin-1/2 anisotropic ferromagnetic-antiferromagnetic alternating Heisenberg chain is determined. This model reduces to the spin-1 XXZ chain if the ferromagnetic bond is infinitely strong. The phase boundary between the XY phase and the Haldane phase is determined from the analysis of the numerically obtained energy spectrum of finite-sized systems with the open boundary condition. Our results are consistent with the series-expansion results by Yamanaka et al . within their error bars. The boundary between the ferromagnetic phase and the XY phase is also determined by comparing the energy eigenvalues of these two phases.

Journal of the Physical Society of JapanOct 15, 19934 citations

Edge modes and boundary impurities in the anisotropic Heisenberg spin chain

Pradip Kattel, Parameshwar R. Pasnoori, J. H. Pixley +1 more

The authors study here boundary phenomena in a gapped anisotropic Heisenberg spin chain, revealing a rich phase diagram from the interplay of fractionalized spin-\textonequarter{} edge modes and a spin-\textonehalf{} impurity. The study uncovers distinct Kondo and bound mode phases, and a novel phase with midgap excitations for nonintegrable antiferromagnetic coupling, providing new insights into impurity screening and Kondo effects. Surprisingly, impurity screening can occur with nonintegrable ferromagnetic coupling, while the impurity remains unscreened for integrable ferromagnetic coupling.The authors study here boundary phenomena in a gapped anisotropic Heisenberg spin chain, revealing a rich phase diagram from the interplay of fractionalized spin-\textonequarter{} edge modes and a spin-\textonehalf{} impurity. The study uncovers distinct Kondo and bound mode phases, and a novel phase with midgap excitations for nonintegrable antiferromagnetic coupling, providing new insights into impurity screening and Kondo effects. Surprisingly, impurity screening can occur with nonintegrable ferromagnetic coupling, while the impurity remains unscreened for integrable ferromagnetic coupling.

arXiv:2412.00194Physical review. B./Physical review. BMay 19, 20258 citations

Phase transition in the three-dimensional anisotropic Heisenberg antiferromagnetic model

J. Ricardo de Sousa, J. A. Plascak

Physics Letters ADec 1, 199717 citations

The phase diagram of the extended anisotropic ferromagnetic-antiferromagnetic Heisenberg chain

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