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Symmetry
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Quantum Phenomena in Magnetic Materials
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Quantum Phenomena in Magnetic Materials

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 4626

Special Issue Editor

Dr. Robert Georgii

E-Mail Website
Guest Editor
Department of Physics,Technical University Munich, Lichtenbergstr.1, 85748 Garching, Germany
Interests: magnetic properties; magnetic materials magnetism; radiation detection

Special Issue Information

Dear colleagues,

Although mankind has known about magnetite for more than 2500 years, our knowledge of magnetic materials is still fast-growing and magnetic materials play a vast role in modern technology throughout all aspects and fields. Their applications range from permanent magnets, though to computer storage, superconductors, sensors, and actuators, to very special applications in optics, electronics, nuclear spin resonance imaging, and calorimetrics.

Magnetic materials also have a vast number of quantum phenomena ranging from the existence of magnetic “monopoles”, a surprising role of magnetism in the existence of novel superconducting phases to topological protected large objects. These skyrmions were first observed in non-centrosymmetric cubic magnetic materials with emergent topological spin structure. Furthermore, parity-time (PT) symmetry-breaking phase transition also could be seen in quantum spin systems. Amongst others, all these phenomena are of special importance for applications in future quantum computing. On the theoretical side, these materials can now be understood from first principles and give hints for finding even more of such interesting phenomena.

This Special Issue of Symmetry is devoted to reporting experimental, theoretical, and numerical work in magnetic materials, as well as their technical applications.

Dr. Robert Georgii
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic materials
  • magnetic quantum phenomena
  • quantum technology
  • quantum computing
  • topology
  • superconductor
  • skyrmion
  • quantum phase transition

Published Papers (2 papers)

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Research

18 pages, 50429 KiB  
Article
Structural Investigation into Magnetic Spin Orders of a Manganese Phosphatic Oxyhydroxide, Mn5[(PO4)2(PO3(OH))2](HOH)4
by Sohyun Park, Anna Hartl, Denis Sheptyakov, Markus Hoelzel and Ana Arauzo
Symmetry 2021, 13(9), 1688; https://doi.org/10.3390/sym13091688 - 13 Sep 2021
Cited by 1 | Viewed by 1633
Abstract
The ferri- and antiferromagnetic structures of a hureaulite-type synthetic compound, Mn2+5(PO4)2(PO3(OH))2(HOH)4, were elucidated by high-resolution neutron powder diffraction in combination with magnetic susceptibility and heat capacity measurements. At 6.17 K, [...] Read more.
The ferri- and antiferromagnetic structures of a hureaulite-type synthetic compound, Mn2+5(PO4)2(PO3(OH))2(HOH)4, were elucidated by high-resolution neutron powder diffraction in combination with magnetic susceptibility and heat capacity measurements. At 6.17 K, the paramagnetic phase (space group: C2/c) transforms to inherit a ferrimagnetic order (magnetic space group: C2′/c′), followed at 1.86 K by an incommensurately modulated antiferromagnetic order (magnetic superspace group: P21/c.1′(α0γ)00s with the propagation vector k(0.523(2), 0, 0.055(1)). In the ferrimagnetic state, antiferromagnetic interactions are dominant for both intra and inter pentamers of Mn2+(O, HOH)6 octahedra. Differently aligned spin-canting sublattices seen in the ferrimagnetic models at 3.4, 4.5, and 6.1 K explain a weak ferromagnetism in the title compound. The observation of magnetic moments vigorously changing in a small temperature range of 6.1–1.5 K adumbrates a high complexity of interplaying structural and magnetic orders in this manganese phosphatic oxyhydroxide. Full article
(This article belongs to the Special Issue Quantum Phenomena in Magnetic Materials)
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11 pages, 2628 KiB  
Article
Tachyons and Solitons in Spontaneous Symmetry Breaking in the Frame of Field Theory
by Yiannis Contoyiannis, Michael P. Hanias, Pericles Papadopoulos, Stavros G. Stavrinides, Myron Kampitakis, Stelios M. Potirakis and Georgios Balasis
Symmetry 2021, 13(8), 1358; https://doi.org/10.3390/sym13081358 - 27 Jul 2021
Cited by 7 | Viewed by 2230
Abstract
This paper presents our study of the presence of the unstable critical point in spontaneous symmetry breaking (SSB) in the framework of Ginzburg–Landau (G-L) free energy. Through a 3D Ising spin lattice simulation, we found a zone of hysteresis where the unstable critical [...] Read more.
This paper presents our study of the presence of the unstable critical point in spontaneous symmetry breaking (SSB) in the framework of Ginzburg–Landau (G-L) free energy. Through a 3D Ising spin lattice simulation, we found a zone of hysteresis where the unstable critical point continued to exist, despite the system having entered the broken symmetry phase. Within the hysteresis zone, the presence of the kink–antikink SSB solitons expands and, therefore, these can be observed. In scalar field theories, such as Higgs fields, the mass of this soliton inside the hysteresis zone could behave as a tachyon mass, namely as an imaginary quantity. Due to the fact that groups Ζ(2) and SU(2) belong to the same universality class, one expects that, in future experiments of ultra-relativistic nuclear collisions, in addition to the expected bosons condensations, structures of tachyon fields could appear. Full article
(This article belongs to the Special Issue Quantum Phenomena in Magnetic Materials)
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