Zobrazeno 1 - 10
of 343
pro vyhledávání: '"De Cesare L"'
Publikováno v:
J. Magn. Magn. Mater. 472, 40-48 (2019)
The two-time Green function method is employed to explore the effect of the biquadratic exchange interaction on the phase diagram of a $d$-dimensional spin-1 transverse XY model with single-ion anisotropy close to the magnetic-field-induced quantum c
Externí odkaz:
http://arxiv.org/abs/1810.05505
A study of the d-dimensional classical Heisenberg ferromagnetic model in the presence of a magnetic field is performed within the two-time Green function's framework in classical statistical physics. We extend the well known quantum Callen method to
Externí odkaz:
http://arxiv.org/abs/1111.3177
Publikováno v:
Eur. Phys. J. B 84, 371 (2011)
The quantum tricriticality of d-dimensional transverse Ising-like systems is studied by means of a perturbative renormalization group approach focusing on static susceptibility. This allows us to obtain the phase diagram for 3
Externí odkaz:
http://arxiv.org/abs/1111.1515
Two-time Green's functions and spectral density method in nonextensive quantum statistical mechanics
Publikováno v:
Phys. Rev. E 77, 051110 (2008)
We extend the formalism of the thermodynamic two-time Green's functions to nonextensive quantum statistical mechanics. Working in the optimal Lagrangian multipliers representation, the $q$-spectral properties and the methods for a direct calculation
Externí odkaz:
http://arxiv.org/abs/0710.5695
Publikováno v:
Phys. Rev. B 75, 014105 (2007)
A nonconventional renormalization-group (RG) treatment close to and below four dimensions is used to explore, in a unified and systematic way, the low-temperature properties of a wide class of systems in the influence domain of their quantum critical
Externí odkaz:
http://arxiv.org/abs/cond-mat/0701340
The field-induced quantum criticality of compounds with ferromagnetically coupled structural spin units (as dimers and ladders) is explored by applying Wilson's renormalization group framework to an appropriate effective action. We determine the low-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0605274
In this article we review a less known unperturbative and powerful many-body method in the framework of classical statistical mechanics and then we show how it works by means of explicit calculations for a nontrivial classical model. The formalism of
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602446
Motived by the necessity of explicit and reliable calculations, as a valid contribution to clarify the effectiveness and, possibly, the limits of the Tsallis thermostatistics, we formulate the Two-Time Green Functions Method in nonextensive quantum s
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509784
Publikováno v:
Physica A 270 (1999) 486
The critical behaviour of thin films containing quenched random impurities and inhomogeneities is investigated by the renormalization-group method. The finite-size crossover in impure films has been considered on the basis of the fundamental relation
Externí odkaz:
http://arxiv.org/abs/cond-mat/0509720
Publikováno v:
In Physica B: Physics of Condensed Matter 1 May 2018 536:422-426