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We perform a study about effects of an applied magnetic field and a finite chemical potential on the size-dependent phase structure of a first-order transition. These effects are introduced by using methods of quantum fields defined on…

统计力学 · 物理学 2013-05-31 E. B. S. Corrêa , C. A. Linhares , A. P. C. Malbouisson

We apply a microscopic theory of polarization and magnetization to crystalline insulators at zero temperature and consider the orbital electronic contribution of the linear response to spatially varying, time-dependent electromagnetic…

介观与纳米尺度物理 · 物理学 2021-11-08 Perry T. Mahon , J. E. Sipe

We develop a formalism for the calculation of the macroscopic dielectric response of composite systems made of particles of one material embedded periodically within a matrix of another material, each of which is characterized by a well…

We predict the universal power law dependence of localization length on magnetic field in the strongly localized regime. This effect is due to the orbital quantum interference. Physically, this dependence shows up in an anomalously large…

无序系统与神经网络 · 物理学 2015-06-15 L. B. Ioffe , B. Z. Spivak

We present a study of the magnetocaloric effect in metallic systems exhibiting first-order magnetic transitions and focus on consequences of magnetic phase separation. We account for ferrimagnetic, ferromagnetic, and Neel antiferromagnetic…

强关联电子 · 物理学 2021-07-22 V. V. Ivchenko , P. A. Igoshev

The possibility of the existence of magnetic charges is one of the greatest unsolved issues of the physics of this century. The concept of magnetic monopoles has at least two attractive features: (i) Electric and magnetic fields can be…

高能物理 - 唯象学 · 物理学 2008-02-03 Rainer W. Kuhne

We use symmetry analysis and density functional theory to show that changes in magnetic order at a surface with respect to magnetic order in the bulk can be generically determined by considering local magnetoelectric responses of the…

材料科学 · 物理学 2024-12-10 Sophie F. Weber , Andrea Urru , Nicola A. Spaldin

We calculate the magnetization of the two-dimensional electron gas in a short-period lateral superlattice, with the Coulomb interaction included in Hartree and Hartree-Fock approximations. We compare the results for a finite, mesoscopic…

介观与纳米尺度物理 · 物理学 2009-09-25 Vidar Gudmundsson , Sigurdur I. Erlingsson , Andrei Manolescu

We study the magnetic response of mesoscopic metallic isolated networks. We calculate the average and typical magnetizations in the diffusive regime for non-interacting electrons or in the first order Hartree-Fock approximation. These…

凝聚态物理 · 物理学 2009-10-28 Michael Pascaud , Gilles Montambaux

One important aspect of the magneto-structural transition in MnCoGe and related materials is the reduction in saturation magnetization from the orthorhombic to the hexagonal phase. Here, by combining an element specific magnetization probe…

强关联电子 · 物理学 2016-04-20 F. Guillou , F. Wilhelm , O. Tegus , A. Rogalev

There is a widely-held belief amongst theoreticians that the Gilbert damping parameter {\alpha} in magnetization dynamics is infinite for a pure metal at T=0. The basic error leading to this belief is pointed out explicitly and the various…

材料科学 · 物理学 2018-09-26 D. M. Edwards

Within the broad class of multiferroics (compounds showing a coexistence of magnetism and ferroelectricity), we focus on the subclass of "improper electronic ferroelectrics", i.e. correlated materials where electronic degrees of freedom…

材料科学 · 物理学 2012-07-26 Silvia Picozzi , Alessandro Stroppa

The paper studies the spatial variation of the magnetization in a nonconducting magnetic sample with an excess number of magnons in comparison to the equilibrium. The phenomenon is considered using the Landau-Lifshits equation with…

材料科学 · 物理学 2016-09-16 V. I. Sugakov

Emergent concepts from astroparticle physics are incorporated into a classical solution of the Einstein-Maxwell equations for a binary magnetohydrodynamic fluid, in order to describe the final equilibrium state of compact objects infused…

太阳与恒星天体物理 · 物理学 2012-09-18 Zoran Pazameta

Theory of pointlike magnetic monopole with an arbitrary magnetic charge is considered. It is shown that a proper description requires making use of nonunitary representations of the rotation group and the nonassociative generalization of…

高能物理 - 理论 · 物理学 2012-07-05 Alexander I Nesterov , F. Aceves de la Cruz

Magnetization of soft-ferromagnetic nano- and microtubes of nanometer-thin walls (a single-widening rolled-up nanomembranes) is theoretically studied using analytical and numerical approaches including different stress-induced anisotropies.…

介观与纳米尺度物理 · 物理学 2016-09-12 Andrzej Janutka

We propose two different macroscopic dynamics to describe the decay of metastable phases in many-particle systems with local interactions. These dynamics depend on the macroscopic order parameter $m$ through the restricted free energy…

凝聚态物理 · 物理学 2016-08-31 J. Lee , M. A. Novotny , P. A. Rikvold

We consider all magnetic monopoles that could have settled in the Standard Model after descending from a generic microscopic theory. These monopoles have Standard Model quantum numbers, are stable, and we also require that their magnetic…

高能物理 - 唯象学 · 物理学 2024-12-10 Valentin V. Khoze

In this paper we study the Macroscopic Quantum Oscillation (MQO) effect in ferromagnetic single domain magnets with a magnetic field applied along the hard anistropy axis. The level splitting for the ground state, derived with the…

介观与纳米尺度物理 · 物理学 2009-10-31 S. P. Kou , J. Q. Liang , Y. B. Zhang , F. C. Pu

Magnetoelastic coupling, i.e., the change of crystal lattice induced by a spin order, is not only scientifically interesting, but also technically important. In this work, we propose a general microscopic model from first-principles…

材料科学 · 物理学 2015-06-24 X. Z. Lu , Xifan Wu , H. J. Xiang