Zobrazeno 1 - 10
of 163
pro vyhledávání: '"Magalhães, S. G."'
In this work, we theoretically demonstrate that a strong enhancement of the Magnetocaloric Effect is achieved in geometrically frustrated cluster spin-glass systems just above the freezing temperature. We consider a network of clusters interacting ra
Externí odkaz:
http://arxiv.org/abs/2304.10449
The Blume-Emery-Griffiths model with a random crystal field is studied in a random graph architecture, in which the average connectivity is a controllable parameter. The disordered average over the graph realizations is treated by replica symmetry fo
Externí odkaz:
http://arxiv.org/abs/2302.00712
We investigate the onset and evolution of under the simultaneous application of pressure and magnetic field of distinct itinerant N\'eel states using the underscreened Anderson Lattice Model (UALM) which has been proposed to describe $5f$-electron sy
Externí odkaz:
http://arxiv.org/abs/2112.07853
In the present work, we will study the superconducting properties of a mesoscopic three-dimensional prism with square transversal section under an external magnetic field in both Zero-Field Cooling (ZFC) and Field-Cooling (FC) process. The studied sa
Externí odkaz:
http://arxiv.org/abs/2112.05192
In this paper we investigate the electronic and superconducting properties in nickelate compounds of NiO2 through Perturbative Density Functional Theory (P-DFT) and multi-band BCS theory. We consider three different cases of study (i) the crystalline
Externí odkaz:
http://arxiv.org/abs/2112.03812
In the present work we studied the magnetization, vorticity, Cooper pairs density and the space distribution of the local magnetic field in a three-dimensional superconductor with a SQUID geometry (a square with a central hole connected to the outsid
Externí odkaz:
http://arxiv.org/abs/2112.01179
Quenched disorder effects on frustrated systems are explored by considering random fluctuations on the antiferromagnetic (AF) interactions between spins on the checkerboard lattice. The replica framework is adopted within a cluster mean-field approac
Externí odkaz:
http://arxiv.org/abs/2111.06176
Publikováno v:
Phys. Rev. E 103, 052110 (2021)
We develop a novel method based in the sparse random graph to account the interplay between geometric frustration and disorder in cluster magnetism. Our theory allows to introduce the cluster network connectivity as a controllable parameter. Two type
Externí odkaz:
http://arxiv.org/abs/2104.06525
Publikováno v:
Phys. Rev. E 103, 022133 Published 19 February 2021
We investigate thermodynamic phase transitions of the joint presence of spin glass (SG) and random field (RF) using a random graph model that allows us to deal with the quenched disorder. Therefore, the connectivity becomes a controllable parameter i
Externí odkaz:
http://arxiv.org/abs/2102.11359
We investigate the occurrence of multicritical points under pressure and magnetic field in a model that describes two 5f bands (of either $\alpha$ or $\beta$ characters) which hybridize with a single itinerant conduction band. The 5f-electrons intera
Externí odkaz:
http://arxiv.org/abs/2002.02796