Exact Diagonalization Study of an Extended Hubbard Model for a Cubic Cluster at Quarter Filling

• Authors: K. Szałowski , T. Balcerzak , M. Jaščur , A. Bobák , M. Žukovič
• Languages of publication: EN

Abstracts

EN

In the paper the thermodynamics of a cubic cluster with 8 sites at quarter filling is characterized by means of exact diagonalization technique. Particular emphasis is put on the behaviour of such response functions as specific heat and magnetic susceptibility. The system is modelled with extended Hubbard model which includes electron hopping between both first and second nearest neighbours as well as Coulombic interactions, both on-site and between nearest-neighbour sites. The importance of hopping between second nearest neighbours and Coulombic interactions between nearest neighbours for the temperature dependences of thermodynamic response functions is analysed. In particular, the predictions of the Schottky model are compared with the calculations based on the full energy spectrum.

Keywords

EN

75.40.Cx; 75.75.-c; 75.10.Lp; 71.27.+a; 65.80.-g; 05.70.Ce

Discipline

• 75.75.-c: Magnetic properties of nanostructures
• 05.70.Ce: Thermodynamic functions and equations of state(see also 51.30.+i Thermodynamic properties, equations of state in physics of gases; for equations of state of specific substances, see 64.30.-t; for equations of state of nuclear matter, and of neutron-star matter, see 21.65.Mn and 26.60.Kp, respectively; see also 95.30.Tg in astronomy; for thermodynamic properties of superconductors, see 74.25.Bt)
• 71.27.+a: Strongly correlated electron systems; heavy fermions
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 65.80.-g: Thermal properties of small particles, nanocrystals, nanotubes, and other related systems
• 75.10.Lp: Band and itinerant models

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 131
• Issue: 4
• Pages: 1012-1014

Dates

published

2017-04

Contributors

author

K. Szałowski

• Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, Pomorska 149/153, PL-90236 Łódź, Poland

author

T. Balcerzak

• Department of Solid State Physics, Faculty of Physics and Applied Informatics, University of Łódź, Pomorska 149/153, PL-90236 Łódź, Poland

author

M. Jaščur

• Department of Theoretical Physics and Astrophysics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

A. Bobák

• Department of Theoretical Physics and Astrophysics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Žukovič

• Department of Theoretical Physics and Astrophysics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.131.1012