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Volume 6 Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212 Magnetic Materials 2018
October 22-23, 2018
October 22-23, 2018 | Rome, Italy
3rd International Conference on
Magnetism and Magnetic Materials
The electron correlation effect on the magnetic properties of quasi-one dimensional-materials on the
base of graphitic nanoclusters with embedded transition metals
Vladyslav O Cheranovskii1, Viktor V Slavin 2 and Elena V Ezerskaya1
1V.N. Karazin Kharkiv National University, Ukraine
2B.Verkin Institute for Low Temperature Physics and Engineering, Ukraine
It is well known, the phase diagrams of the nanostructured magnetic materials demonstrate a variety of low-spin and high-spin
states. The switch ability of these states is the central point to potential applications in molecular spintronics and high-density
magnetic data storage. In this work, we studied the energy spectrum and thermodynamics of quantum Heisenberg spin model for
graphitic nanoribbons with periodically embedded heteroatoms and model chain magnets formed by triangular graphitic clusters.
The exact diagonalization study, density matrix renormalization group and QuantumMonte-Carlo method based on stochastic series
expansion approach were used for this purpose. We found that clusters with frustrated interactions could exhibit spin switching when
the corresponding coupling parameters are changed. For several carbon nanoribbons, we found macroscopic ground state spin and
intermediate magnetization plateau. We also studied the exact thermodynamics of infinite distorted nanoribbons described by the
special case of Heisenberg-Ising model. Special attention was given to the doped systems described by single-band Hubbard model
with strong electron repulsion at partial electron filling. Here we used cyclic spin permutation formalism to derive the corresponding
low-energy lattice Hamiltonians. We found numerically the possibility of the spin switching with the change of model parameters.
We also demonstrated that the correlated hopping terms, which are present in our Hamiltonians, may change significantly the lowest
energy spectra of the corresponding magnets in comparison with the similar description within the framework of the t-J model.
Figure 1: Graphitic clusters with embedded heteroatoms
Recent Publications
1. V O Cheranovskii, D J Klein, E V Ezerskaya and V V Tokarev (2018) Finite size effects in anisotropic U=∞ Hubbard
ladder rings. Journal of Superconductivity and Novel Magnetism 31:1369-1373.
2. V O Cheranovskii, D J Klein, E V Ezerskaya and V V Tokarev (2017) Validity of t-J approximation for extended
Hubbard model with strong repulsion. Low Temperature Physics 43:1622-1625
3. V O Cheranovskii, D J Klein, E V Ezerskaya, V V Tokarev (2017) Lowest energy states of Hubbard ladder model with
infinite electron repulsion. Computational and Theoretical Chemistry 1116:112-116.
4. V O Cheranovskii, E V Ezerskaya, D J Klein and V V Tokarev (2017) Ground state spin of Hubbard model with infinite
electron repulsion. Acta Physica Polonica Series a 131(4):916-918.
5. VOCheranovskii and E V Ezerskaya (2015) Magnetic properties of the infinite UHubbard model on one-dimensional
frustrated lattices. Journal of Superconductivity and Novel Magnetism 28:773-776.
Biography
Vladyslav O Cheranovskii has completed his Doctor of Sciences in the year 1994 from Institute for Single Crystal. He is the Professor of V.N.Karazin Kharkiv
National University, Department of Chemistry. He has published 49 papers recognized by Scopus and Web of Science databases. He is working in field of Solid
State Physics and Quantum Chemistry. His main subject of interests includes strongly correlated electron system quantum theoretical simulation of electron
structure and thermodynamics of nanomagnets.
Vladyslav O Cheranovskii et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C6-029