The ground state spin ordering and lowest energy excitations of a model organic ferrimagnet-polyallyl spin chain

Date

2001-01-01

Author

Cheranovskii, VO
Özkan, İlker

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

151
views

0
downloads

We studied zero-temperature magnetic ordering in a model organic ferrimagnet-polyallyl spin-1/2 chain as a function of the exchange integral lambda describing the interaction between spins of radical centers and the main chain. Exact diagonalization and density matrix renormalization group (DMRG) methods demonstrated that for small applied fields, the difference in zero-temperature magnetizations of the sublattices reaches a maximum value at lambda = 0.70. It was shown that there is a critical value of magnetic field above which this ferrimagnetic ordering is destroyed. We also present the results of DMRG calculations that showed the gap character of excitations without decrease of the total spin for lambda greater than or equal to 0.4.

Subject Keywords

Organic ferrimagnet, Spin ordering

URI

https://hdl.handle.net/11511/31131

Journal

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

DOI

https://doi.org/10.1016/s0304-8853(00)00718-6

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

The path integral quantization and the construction of the S-matrix operator in the Abelian and non-Abelian Chern-Simons theories Fainberg, VY; Pak, Namık Kemal; Shikakhwa, MS (IOP Publishing, 1997-06-07) The covariant path integral quantization of the theory of the scalar and spinor fields interacting through the Abelian and non-Abelian Chern-Simons gauge fields in 2 + 1 dimensions is carried out using the De Witt-Fadeev-Popov method. The mathematical ill-definiteness of the path integral of theories with pure Chern-Simons' fields is remedied by the introduction of the Maxwell or Maxwell-type (in the non-Abelian case) terms, which make the resulting theories super-renormalizable and guarantees their gauge-i...
The energy spectrum of a spin-1/2 ladder with mixed interactions Cheranovskii, VO; Ezerskaya, EV; Özkan, İlker (2001-05-21) We studied the energy spectrum of two coupled XY spin-1/2 chains with different exchange integrals and inter-chain interaction of Ising type. The thorough analytical treatment of two-magnon states was given for finite and infinite lattice strips. To study the case of macroscopic number of inverted spins we used the corresponding density matrix renormalization group (DMRG) simulation. We also derived the self-consistent Bardeen-Cooper-Schrieffer (BCS) estimates for the lowest energies of the system. The comp...
The electronic band structure of AlN, AlSb, AlAs and their ternary alloys with In Mohammad, Rezek; Katırcıoğlu, Şenay (World Scientific Pub Co Pte Lt, 2006-09-10) The electronic band structure of AlN, AlSb, AlAs and their ternary alloys with In has been investigated by ETB. The ETB method has been formulated for sp(3)d(2) basis and nearest neighbor interactions of the compounds and its energy parameters have been derived from the results of the present first principles calculations carried on AlN, AjSb and AlAs. It has been found that the present ETB energy parameters can produce the band structure of the compounds and their ternary alloys with In successfully.
FIRST-PRINCIPLES CALCULATIONS FOR THE STRUCTURAL AND ELECTRONIC PROPERTIES OF ScxAl1-xN ALLOYS Mohammad, Rezek; Katırcıoğlu, Şenay (World Scientific Pub Co Pte Lt, 2013-10-01) The first-principles calculations based on Density Functional Theory (DFT) within generalized gradient approximation (GGA) of Engel-Vosko-Perdew-Wang and modified exact exchange potential of Becke-Johnson have been introduced for the structural and electronic properties of the ScxAl1-xN alloys, respectively. The present lattice constants calculated for the ScAlN alloys and the end compounds (AlN and ScN) are found to be in very good agreement with the available experimental and theoretical ones. The stable ...
Understanding the influence of hydrogen bonding and diisocyanate symmetry on the morphology and properties of segmented polyurethanes and polyureas: Computational and experimental study Sami, Selim; Yıldırım, Erol; Yurtsever, Mine; Yurtsever, Ersin; Yilgor, Emel; Yilgor, Iskender; Wilkes, Garth L. (Elsevier BV, 2014-09-02) Quantum mechanical calculations (QMC) and dissipative particle dynamics (DPD) siniulations were utilized to understand the nature of the short and long-range hydrogen bonding and its influence on the microphase morphology in segmented polyurethanes and segmented polyureas prepared without chain extenders through the stoichiometric reactions of hydroxy or amine terminated poly(tetramethylene oxide) (PTMO-1000) with 1,4-phenylene diisocyanate (PPDI) and 1,3-phenylene diisocyanate (MPDI). The possibility of lo...

Citation Formats

V. Cheranovskii and İ. Özkan, “The ground state spin ordering and lowest energy excitations of a model organic ferrimagnet-polyallyl spin chain,” JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, pp. 156–162, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31131.