Phase Transitions in Spin-1/2 Falicov-Kimball Model on a Two-dimensional Triangular Lattice

被引：1

作者：

Kumar, Sant ^{[1
]}

Ray, Avijeet ^{[2
]}

机构：

[1] Vaish Coll Rohtak, Dept Phys, Rohtak 124001, Haryana, India

[2] Indian Inst Technol Roorkee, Dept Phys, Roorkee 247667, Uttarakhand, India

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2017年 / 189卷 / 1-2期

关键词：

Strongly correlated electronic systems; Numerical simulations; Triangular lattice; Exchange interaction; MAGNETIC-PROPERTIES; SUPERCONDUCTIVITY; HOLES; SPINS;

D O I：

10.1007/s10909-017-1793-z

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Phase transitions from low-temperature (ordered) phases to high-temperature (disordered/homogeneous) phases for different fillings are studied on a triangular lattice using the spin-dependent Falicov-Kimball model. Numerical diagonalization and Monte Carlo simulation methods are used to study thermodynamic properties of the system. It has been observed that low-temperature ordered phases persist up to a finite temperature and after reaching a critical temperature (), homogeneous phases are observed for all parameter space. We have also calculated the temperature dependence of specific heat and observed a sharp jump at indicating the phase transition, and this increases with increase in on-site Coulomb correlation U and electron fillings.

引用

页码：98 / 107

页数：10

共 26 条

[1] Evidence for an excitonic insulator phase in 1T-TiSe2 [J].

Cercellier, H. ;

Monney, C. ;

Clerc, F. ;

Battaglia, C. ;

Despont, L. ;

Garnier, M. G. ;

Beck, H. ;

Aebi, P. ;

Patthey, L. ;

Berger, H. ;

Forro, L. .

PHYSICAL REVIEW LETTERS, 2007, 99 (14)

[2] CHARGE MODULATIONS IN LA2-XSRXNIO4+Y - ORDERING OF POLARONS [J].

CHEN, CH ;

CHEONG, SW ;

COOPER, AS .

PHYSICAL REVIEW LETTERS, 1993, 71 (15) :2461-2464

[3] Synthesis, structure, and magnetic properties of NaTiO2 [J].

Clarke, SJ ;

Fowkes, AJ ;

Harrison, A ;

Ibberson, RM ;

Rosseinsky, MJ .

CHEMISTRY OF MATERIALS, 1998, 10 (01) :372-384

[4] Impurity distribution in a frustrated system [J].

Czajka, Katarzyna ;

Maska, Maciej M. .

PHYSICA B-CONDENSED MATTER, 2006, 378-80 :275-277

[5] SIMPLE MODEL FOR SEMICONDUCTOR-METAL TRANSITIONS - SMB6 AND TRANSITION-METAL OXIDES [J].

FALICOV, LM ;

KIMBALL, JC .

PHYSICAL REVIEW LETTERS, 1969, 22 (19) :997-&

[6] The role of intra- and inter-site exchange correlations in the extended Falicov-Kimball model on a triangular lattice [J].

Kumar, Sant ;

Yadav, Umesh K. ;

Maitra, T. ;

Singh, Ishwar .

SOLID STATE COMMUNICATIONS, 2016, 228 :1-5

[7] Study of ground state phases for spin-1/2 Falicov-Kimball model on a triangular lattice [J].

Kumar, Sant ;

Yadav, Umesh K. ;

Maitra, T. ;

Singh, Ishwar .

SOLID STATE COMMUNICATIONS, 2014, 189 :21-27

[8] Model of charge and magnetic order formation in itinerant electron systems [J].

Lemanski, R .

PHYSICAL REVIEW B, 2005, 71 (03)

[9] Stripe phases in the two-dimensional Falicov-Kimball model [J].

Lemanski, R ;

Freericks, JK ;

Banach, G .

PHYSICAL REVIEW LETTERS, 2002, 89 (19) :1-196403

[10]

Lorenzana J., 2003, J PHYS A, V36, P9265

← 1 2 3 →