Record ID

UAM918e8500f26243219cd5f9bed860b7c9

Author

Konrad Jerzy Kapcia Konrad Jerzy Kapcia,, Zakład Teorii Materii Skondensowanej [nowa struktura organizacyjna] (SNŚ/WyF/JBWF)Szkoła Nauk Ścisłych [nowa struktura organizacyjna] (SNŚ)External affiliation of publication: Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences

J. Krawczyk J. Krawczyk,, External affiliation of publication: Wlodzimierz Trzebiatowski Institute of Low Temperature and Structure Research of the Polish Academy of Sciences

R. Lemański R. Lemański,, External affiliation of publication: Wlodzimierz Trzebiatowski Institute of Low Temperature and Structure Research of the Polish Academy of Sciences

Journal series

Condensed Matter Physics, ISSN 1607-324X, e-ISSN 2224-9079

Issue year

2020

Vol

23

No

4

Pages

1-11

Article number

43706

Keywords in original language

extended Falicov-Kimball model ; correlated electron systems ; lattice models incondensed matter ; mean-field theories ; intersite interactions, ; Bethe lattice

ASJC Classification

3101 Physics and Astronomy (miscellaneous); 3104 Condensed Matter Physics

Abstract in original language

We analyze in detail a behavior of the order parameter in the half-filled extended Falicov-Kimball model for small Coulomb interactions (both onsite 𝑈and intersite 𝑉). The parameteris defined as the difference of localized electron concentrations in both sublattices of the Bethelattice (in the limit of large coordination number). Using two methods, namely, the dynamicmean field theory and the Hartree-Fock approximation, we found the ranges of 𝑈and 𝑉forwhich the anomalous temperature dependence of the order parameter, characterized by thesharp reduction near 𝑇≈𝑇C/2, occurs (𝑇Cis the temperature of the continuous order-disordertransition). In order to quantitatively describe this anomaly, we defined a function that measuresthe departure of the order parameter dependence from the standard mean-field 𝑆=1/2Ising-like curve. We determined the 𝑈-dependent critical value 𝑉Cof 𝑉above which the anomalydisappears. Indicators of the anomalous behavior of the parameter dependence can be alsoobserved in the temperature dependence of the specific heat.

DOI

DOI:10.5488/CMP.23.43706 Opening in a new tab

Language

(en) English

Score (nominal)

40

Score source

journalList

Score

Ministerial score = 40.0, 24-12-2021, ArticleFromJournal

Publication indicators

Scopus Citations = 1; WoS Citations = 1; GS Citations = 1; Scopus SNIP: 2018 = 0.547; WoS Impact Factor: 2019 (2 years) = 0.581 - 2019 (5 years) =0.578

Citation count

1

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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or PerishOpening in a new tab system.