Specific Heat of defects in the Haldane System Y_2BaNiO_5

Abstract

We calculate the specific heat of the antiferromagnetic spin-1 chain compound Y_2BaNi_{1-x}Zn_xO_5 in the presence of a magnetic field. The low-energy spectrum of a Heisenberg Hamiltonian, which includes realistic anisotropies, has been solved using the density matrix renormalization group. The observed Schottky anomaly is very well described by this theory. For large chains ($N>50$), contrary to previous interpretations of the specific heat data, we find S=1/2 states. These results are thus also consistent with electron- spin-resonance data for NENP.

4 pages, 4 figures, Latex file

References in corpus (1)

• Spin dynamics of hole doped Y2BaNiO5

Cited by in corpus (27)

• The density-matrix renormalization group
• Defects in correlated metals and superconductors
• New Trends in Density Matrix Renormalization
• Y NMR imaging of the staggered magnetization in doped Haldane chain Y(2)BaNi(1-x)Mg(x)O(5)
• New Type of Charge and Magnetic order in the Ferromagnetic Kondo Lattice
• Phase Diagram and Magnetic Excitations of Anisotropic Spin-One Magnets
• Magnetization and dimerization profiles of the cut two-leg spin ladder and spin-1 chain
• Spin Supersolid in Anisotropic Spin-One Heisenberg Chain
• Boundary susceptibility in the spin-1/2 chain: Curie like behavior without magnetic impurities
• Comparison of S=0 and S=1/2 Impurities in Haldane Chain Compound, $Y_{2}BaNi{O}_5$
• Magnetic Phases of Electron-Doped Manganites
• Anomalous spin susceptibility and magnetic polaron formation in the double exchange systems
• Heat Conduction and Magnetic Phase Behavior in Electron-Doped Ca_{1-x} La_x MnO_3(0 <= x <= 0.2)
• Charge and spin inhomogeneous phases in the Ferromagnetic Kondo Lattice Model
• Paramagnetic and antiferromagnetic resonances in the diamagnetically diluted Haldane magnet PbNi2V2O8
• Local probe of fractional edge states of S=1 Heisenberg spin chains
• Evidence of quantum criticality in the doped Haldane system Y2BaNiO5
• Electron Spin Resonance of defects in the Haldane System Y(2)BaNiO(5)
• Spin versus Lattice Polaron: Prediction for Electron-Doped CaMnO3
• Entangled end states with fractionalized spin projection in a time-reversal-invariant topological superconducting wire
• Ferromagnetic Polarons in Manganites
• Magnetic Studies of End-Chain Spin Effects in the Haldane Gap Material Ni(C3H10N2)2N3(ClO4)
• Magnetization profiles and NMR spectra of doped Haldane chains at finite temperatures
• Random interactions and spin-glass thermodynamic transition in the hole-doped Haldane system Y${}_{2-x}$Ca${}_x$BaNiO${}_5$
• Local dynamics and detection of topology in spin-1 chains
• Angular-time evolution for the Affleck-Kennedy-Lieb-Tasaki chain and its edge-state dynamics
• Influence of finite Hund rules and charge transfer on properties of Haldane systems