Magnetism and thermodynamics of spin-1-2,1 decorated Heisenberg chain with spin-1 pendants - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




Magnetism and thermodynamics of spin-1-2,1 decorated Heisenberg chain with spin-1 pendants - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: The magnetic and thermodynamic properties of a new ferrimagnetic decoratedspin-1-2,1 Heisenberg chain with spin-1 pendant spins are investigated forthree cases: A J1,J2>0; B J1>0, J2<0; and C J1<0, J2>0, where J1 and J2are the exchange couplings between spins in the chain and along the rung,respectively. The low-lying and magnetic properties are explored jointly by thereal-space renormalization group, spin wave, and density-matrix renormalizationgroup methods, while the transfer-matrix renormalization group method isinvoked to study the thermodynamics. It is found that the magnon spectraconsist of a gapless and two gapped branches. Two branches in case C haveintersections. The coupling dependence of low-energy gaps are analyzed. In amagnetic field, an m=3-2 m is the magnetization per unit cell plateau isobserved for case A, while two plateaux at m=1-2 and 3-2 are observed forcases B and C. Between the two plateaux in cases B and C, thesublattice magnetizations for the spins coupled by ferromagnetic interactionshave novel decreasing regions with increasing the magnetic field. At finitetemperature, the zero-field susceptibility temperature product chi*T andspecific heat exhibit distinct exotic features with varying the couplings andtemperature for different cases. chi*T is found to converge as T approacheszero, which is different from the divergent behavior in the spin-1-2,1mixed-spin chain without pendants. The observed thermodynamic behaviors arealso discussed with the help of their low-lying excitations.



Author: Shou-Shu Gong, Wei Li, Yang Zhao, Gang Su

Source: https://arxiv.org/







Related documents