scholarly journals Recent progress in the thermodynamics of ferrotoroidic materials

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Antoni Planes ◽  
Teresa Castán ◽  
Avadh Saxena
Keyword(s):  
Phase Transition ◽  
Magnetic Materials ◽  
Experimental Observation ◽  
Recent Progress ◽  
Field Equations ◽  
Basic Field

AbstractRecent theoretical and experimental progress on the study of ferrotoroidic materials is reviewed. The basic field equations are first described and then the expressions for magnetic toroidal moment and toroidization are derived. Relevant materials and experimental observation of magnetic toroidal moment and toroidal domains are summarized next. The thermodynamics of such magnetic materials is discussed in detail with examples of ferrorotoidic phase transition studied using Landau modelling. Specifically, an example of application of Landau modelling to the study of toroidocaloric effect is also provided. Recent results of polar nanostructures with electrical toroidal moment are finally reviewed.

Recent Progress of Open-shell Organic Magnetic Materials and Their Aggregated States

2021 ◽  
Author(s):  
Shaoqiang Dong ◽  
Zhen Li
Keyword(s):  
Physical Properties ◽  
Magnetic Materials ◽  
Recent Progress ◽  
Organic Materials ◽  
Open Shell ◽  
Light Emitting ◽  
Organic Light ◽  
Organic Magnetic Materials ◽  
New Generation

In last decades, open-shell organic materials have attracted scientists’ great attention for their new chemical and physical properties, as well as their possible applications in new generation of organic light-emitting...

Tuning magnetism at the two-dimensional limit: A theoretical perspective

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongzhe Li ◽  
Shuo Li ◽  
Chengyong Zhong ◽  
Junjie He
Keyword(s):  
Magnetic Properties ◽  
Magnetic Materials ◽  
Recent Progress ◽  
Theoretical Perspective ◽  
Two Dimensional

The discovery of two-dimensional (2D) magnetic materials provides an ideal testbed for manipulating the magnetic properties at the atomically thin and the 2D limit. This review gives recent progress on...

scholarly journals Recent progress in the phase-transition mechanism and modulation of vanadium dioxide materials

2018 ◽  
Vol 10 (7) ◽  
pp. 581-605 ◽  
Author(s):  
Zewei Shao ◽  
Xun Cao ◽  
Hongjie Luo ◽  
Ping Jin
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Recent Progress ◽  
Transition Mechanism

Phase Transitions in Nanoscale Ferroelectric Structures

MRS Bulletin ◽  
2009 ◽  
Vol 34 (11) ◽  
pp. 832-837 ◽  
Author(s):  
S.K. Streiffer ◽  
D.D. Fong
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Ferroelectric Phase Transition ◽  
Recent Progress ◽  
Ferroelectric Phase ◽  
Model Systems ◽  
Materials Processing ◽  
Phase Transition Behavior ◽  
Great Progress ◽  
The Common

AbstractOver decades of effort, investigations of the intrinsic phase transition behavior of nanoscale ferroelectric structures have been greatly complicated by materials processing variations and by the common and uncontrolled occurrence of spacecharge, which interacts directly with the polarization and can obscure fundamental behavior. These challenges have largely been overcome, and great progress in understanding the details of this class of phase transitions has been made, largely based on advances in the growth of high-quality, epitaxial ferroelectric films and in the theory and simulation of ferroelectricity. Here we will discuss recent progress in understanding the ferroelectric phase transition in a particular class of model systems: nanoscale perovskite thin-film heterostructures. The outlook for ferroelectric technology based on these results is promising, and extensions to laterally confined nanostructures will be described.

Premetric representation of mechanics, electromagnetism and gravity

2018 ◽  
Vol 15 (supp01) ◽  
pp. 1840002 ◽  
Author(s):  
Yakov Itin
Keyword(s):  
Field Theory ◽  
Constitutive Relations ◽  
Classical Field Theory ◽  
Classical Field ◽  
Field Equations ◽  
Basic Field ◽  
Alternative Representation ◽  
Spacetime Metric ◽  
Underlying Manifold

The premetric formalism is an alternative representation of a classical field theory in which the field equations are formulated without the spacetime metric. Only the constitutive relations between the basic field variables can involve the metric of the underlying manifold. In this paper, we present a brief pedagogical review of the premetric formalism in mechanics, electromagnetism, and gravity.

scholarly journals Thermodynamics and reentrant phase transition for logarithmic nonlinear charged black holes in massive gravity

2020 ◽  
Vol 29 (12) ◽  
pp. 2050081
Author(s):  
S. Rajaee Chaloshtary ◽  
M. Kord Zangeneh ◽  
S. Hajkhalili ◽  
A. Sheykhi ◽  
S. M. Zebarjad
Keyword(s):  
Phase Transition ◽  
Black Holes ◽  
Black Hole ◽  
Quantum Effect ◽  
Massive Gravity ◽  
Nonlinear Electrodynamics ◽  
Model Parameters ◽  
Thermodynamic Quantities ◽  
Field Equations ◽  
Black Hole Solutions

We investigate a new class of [Formula: see text]-dimensional topological black hole solutions in the context of massive gravity and in the presence of logarithmic nonlinear electrodynamics. Exploring higher-dimensional solutions in massive gravity coupled to nonlinear electrodynamics is motivated by holographic hypothesis as well as string theory. We first construct exact solutions of the field equations and then explore the behavior of the metric functions for different values of the model parameters. We observe that our black holes admit the multi-horizons caused by a quantum effect called anti-evaporation. Next, by calculating the conserved and thermodynamic quantities, we obtain a generalized Smarr formula. We find that the first law of black holes thermodynamics is satisfied on the black hole horizon. We study thermal stability of the obtained solutions in both canonical and grand canonical ensembles. We reveal that depending on the model parameters, our solutions exhibit a rich variety of phase structures. Finally, we explore, for the first time without extending thermodynamics phase space, the critical behavior and reentrant phase transition for black hole solutions in massive gravity theory. We realize that there is a zeroth-order phase transition for a specified range of charge value and the system experiences a large/small/large reentrant phase transition due to the presence of nonlinear electrodynamics.

scholarly journals Evidence of the Berezinskii-Kosterlitz-Thouless phase in a frustrated magnet

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ze Hu ◽  
Zhen Ma ◽  
Yuan-Da Liao ◽  
Han Li ◽  
Chunsheng Ma ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Materials ◽  
Quantum Monte Carlo ◽  
Topological Defects ◽  
Topological Phase ◽  
Topological Phase Transition ◽  
Out Of Plane ◽  
Frustrated Magnet ◽  
Experimental Findings ◽  
Quantum Monte Carlo Simulations

Abstract The Berezinskii-Kosterlitz-Thouless (BKT) mechanism, building upon proliferation of topological defects in 2D systems, is the first example of phase transition beyond the Landau-Ginzburg paradigm of symmetry breaking. Such a topological phase transition has long been sought yet undiscovered directly in magnetic materials. Here, we pin down two transitions that bound a BKT phase in an ideal 2D frustrated magnet TmMgGaO4, via nuclear magnetic resonance under in-plane magnetic fields, which do not disturb the low-energy electronic states and allow BKT fluctuations to be detected sensitively. Moreover, by applying out-of-plane fields, we find a critical scaling behavior of the magnetic susceptibility expected for the BKT transition. The experimental findings can be explained by quantum Monte Carlo simulations applied on an accurate triangular-lattice Ising model of the compound which hosts a BKT phase. These results provide a concrete example for the BKT phase and offer an ideal platform for future investigations on the BKT physics in magnetic materials.

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