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A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (31 October 2019) | Viewed by 19516

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Special Issue Editor

Prof. Dr. Yasuhiro H. Matsuda

E-Mail Website
Guest Editor

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan
Interests: Strong magnetic field; Qauntum spin systems; Kondo metals; Valence fluctuation; X-ray dffraction and spectroscopy; Molecular solids

Special Issue Information

Dear Colleagues,

Magnetic field is a special electrical field produced by the relativistic effect between two moving charged particles. It is a weak field compared to a direct electric field and thus generally only has little influence on material properties:In another words, most of the substances in the world are stable thanks to the fact that there is no strong magnetic field on the earth. (This is not the case in other places in cosmic space.)

Some scientists have been interested in the generation of artificial strong magnetic fields and their application to research into condensed matter physics. This is because a variety of fascinating phenomena such as the quantum Hall effect and various kinds of quantum phase transitions have been discovered in strong magnetic fields. The potential properties of matter that are hidden in normal conditions can appear in strong magnetic fields as a result of “Magnetic Field-Induced Phase Transitions”.

We invite researchers who employ strong magnetic fields to control material phases to submit papers. The potential topics include (1) Quantum spin systems, (2) Frustrated magnets, (3) Transition metal oxides, (4) Multiferroic materials, (5) Rare-earth intermetallic compounds, and (6) Molecular solids. Also, since recent progress in the techniques for the measurement of material properties in strong magnetic fields is significant, research is also welcome on (7) Development of measurement techniques to probe field-induced phase transitions.

Prof. Dr. Yasuhiro H. Matsuda
Guest Editor

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Keywords

Quantum spin systems
Frustrated magnets
Transition metal oxides
Multiferroic materials
Rare-earth intermetallic compounds
Molecular solids
Measurement techniques in strong fields

Published Papers (7 papers)

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Editorial

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2 pages, 152 KiB

Open AccessEditorial

Magnetic Field-Induced Phase Transition

by Yasuhiro H. Matsuda

Crystals 2020, 10(10), 866; https://doi.org/10.3390/cryst10100866 - 25 Sep 2020

Cited by 1 | Viewed by 1575

Abstract

The magnetic field controls the spin and orbital motion of electrons and can induce a phase transition through a change of the ground state [...] Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

Research

Jump to: Editorial

7 pages, 629 KiB

Open AccessArticle

The Temperature Dependence of the Magnetization Process of the Kondo Insulator YbB₁₂

by Yasuhiro H. Matsuda, Yoshiki Kakita and Fumitoshi Iga

Crystals 2020, 10(1), 26; https://doi.org/10.3390/cryst10010026 - 07 Jan 2020

Cited by 4 | Viewed by 2577

Abstract

The properties of the Kondo insulator in a strong magnetic field are one of the most intriguing subjects in condensed matter physics. The Kondo insulating state is expected to be suppressed by magnetic fields, which results in the dramatic change in the electronic [...] Read more.

_{12}

at several temperatures in magnetic fields of up to 80 T. The metamagnetism due to the insulator-metal (IM) transition seen around 50 T was found to become significantly broadened at approximately 30 K. This characteristic temperature

T^{*} \approx

30 K in YbB

_{12}

is an order of magnitude lower than the Kondo temperature

T_{K}

= 240 K. Our results suggest that there is an energy scale smaller than the Kondo temperature that is important to understanding the nature of Kondo insulators. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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Figure 1

10 pages, 1389 KiB

Open AccessFeature PaperArticle

Field-Induced Transitions in Highly Frustrated SrHo₂O₄

by Olga Young, Geetha Balakrishnan, Pascal Manuel, Dmitry D. Khalyavin, Andrew R. Wildes and Oleg A. Petrenko

Crystals 2019, 9(10), 488; https://doi.org/10.3390/cryst9100488 - 22 Sep 2019

Cited by 7 | Viewed by 2312

Abstract

SrHo

_{2}

_{4}

is a geometrically frustrated magnet in which the magnetic Ho

^{3 +}

ions are connected through a network of zigzag chains and coupled by several competing interactions. The Ho

^{3 +}

ions show a pronounced Ising anisotropy at low [...] Read more.

SrHo

_{2}

_{4}

is a geometrically frustrated magnet in which the magnetic Ho

^{3 +}

ions are connected through a network of zigzag chains and coupled by several competing interactions. The Ho

^{3 +}

ions show a pronounced Ising anisotropy at low temperatures, and the spins on the two crystallographically inequivalent magnetic sites point along orthogonal crystallographic axes. Using single-crystal neutron diffraction, we report on the development of complex and highly anisotropic short- and long-range magnetic order in SrHo

_{2}

_{4}

induced by an applied magnetic field. For

H ‖ c

, the diffuse scattering around the

k = 0

positions is suppressed and above 0.5 T the spin structure for one of the Ho sites is long-range and ferromagnetic. For

H ‖ b

, planes of diffuse scattering at

Q = (h k \pm \frac{l}{2})

are split by the field, and an up–up–down magnetic order associated with a 1/3-magnetisation plateau develops at 0.8 T. Further increasing the field above 1.2 T allows the second Ho site to also order in a long-range ferromagnetic structure. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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9 pages, 4680 KiB

Open AccessArticle

High Magnetic Field ESR in S = 1 Skew Chain Antiferromagnet Ni₂V₂O₇ Single Crystal

by Lei Yin, Zhongwen Ouyang, Xiaoyu Yue, Zhenxing Wang and Zhengcai Xia

Crystals 2019, 9(9), 468; https://doi.org/10.3390/cryst9090468 - 07 Sep 2019

Cited by 2 | Viewed by 3129

Abstract

We report electron spin resonance (ESR) in S = 1 skew chain antiferromagnet Ni₂V₂O₇, which exhibits a spin-flop transition and a well-defined 1/2 magnetization plateau. The antiferromagnetic (AFM) ordering at T_N = 7 K can be reflected by the temperature-dependent ESR spectra at low frequency for the easy axis. At 2 K, at the spin-flop transition fields along the easy a and b axes, anomalies are observed from the frequency‒field relationship. However, these modes cannot be understood by the conventional two-sublattice AFM resonance theory with uniaxial anisotropy. For the easy b axis, an unusual resonance mode is observed and its resonance field increases with decreasing frequency. This ESR mode becomes softening at ~8 T, corresponding to the onset of the 1/2 magnetization plateau. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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Figure 1

7 pages, 2165 KiB

Open AccessArticle

Field-Induced Magnetic Phase Transitions and Rich Phase Diagram of HoMnO₃ Single Crystal

by Chao Dong, Rui Chen, Yongjie Liu, Congbin Liu, Haipeng Zhu, Jiezun Ke, Wanxin Liu, Ming Yang and Junfeng Wang

Crystals 2019, 9(8), 419; https://doi.org/10.3390/cryst9080419 - 13 Aug 2019

Cited by 5 | Viewed by 3119

Abstract

An extensive magnetization study in pulsed fields up to 62 T and at temperatures down to ~0.7 K has been performed on the single crystals of hexagonal manganite HoMnO₃. For magnetic fields (H) applied along the c-axis, successive magnetic transitions below 10 T and a step-like transition at ~41 T are observed. The phase diagram for H//c is very complex and new phase boundaries are explored below 6 K. This phase diagram is compared with the early results derived from dielectric constant and neutron scattering measurements. For H//a, two magnetic transitions are found below 3 T dome-shaped and the phase diagram is reported for the first time. The variety of magnetic symmetries of the field-induced magnetic phases is discussed. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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Figure 1

11 pages, 1461 KiB

Open AccessArticle

Field-Independent Features in the Magnetization and Specific Heat of Sm₃Co₄Ge₁₃

by Harikrishnan S. Nair, K. Ramesh Kumar, Baidyanath Sahu, Sindisiwe P. Xhakaza, Pramita Mishra, Debkanta Samal, Sarit K. Ghosh, Biju R. Sekhar and André M. Strydom

Crystals 2019, 9(6), 322; https://doi.org/10.3390/cryst9060322 - 25 Jun 2019

Cited by 1 | Viewed by 3257

Abstract

The cubic intermetallic compound Sm

_{3}

_{4}

_{13}

(space group

P m \bar{3} n

) possesses a cage-like structure composed of Ge and displays an antiferromagnetic transition at

T_{N} \approx

6 K in magnetization,

M (T)

, [...] Read more.

The cubic intermetallic compound Sm

_{3}

_{4}

_{13}

(space group

P m \bar{3} n

) possesses a cage-like structure composed of Ge and displays an antiferromagnetic transition at

T_{N} \approx

6 K in magnetization,

M (T)

, specific heat,

C_{p} (T)

and in thermal conductivity,

κ (T)

. The magnetic transition at

T_{N}

is observed to be robust against applied magnetic fields up to 9 T. From the analysis of specific heat, a Sommerfeld coefficient

γ

= 80(2) mJ/mol-Sm K

^{2}

is estimated. The magnetic entropy released at

T_{N}

is estimated as lower than that of a doublet, R ln(2). A positive Seebeck coefficient is observed for the thermopower,

S (T)

. Photoemission spectroscopy reveals distinct electronic character of the near-

E_{F}

valence band states arising out of Co(

3 d

)-Sm(

4 f

) hybridization and Sm(

4 f

) electron correlation. The unusual field-independent features in magnetization, specific heat and electrical transport is an indication of the significant correlation between f and d wave functions. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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11 pages, 353 KiB

Open AccessArticle

Identification of Unentangled–Entangled Border in the Luttinger Liquid Phase

by Somayyeh Nemati, Fatemeh Khastehdel Fumani and Saeed Mahdavifar

Crystals 2019, 9(2), 105; https://doi.org/10.3390/cryst9020105 - 18 Feb 2019

Cited by 7 | Viewed by 2473

Abstract

Quantum discord and entanglement are both criteria for distinguishing quantum correlations in a quantum system. We studied the effect of the transverse magnetic field on the quantum discord of the one-dimensional spin-1/2 XX model. This study focused on the pair of spins at different distances. We show that quantum discord is finite for all studied spin pairs in the Luttinger liquid phase. In addition, relying on our calculations, we show that the derivatives of quantum discord can be used to identify the border between entangled and separable regions in the Luttinger liquid phase. Full article

(This article belongs to the Special Issue Magnetic Field-induced Phase Transition)

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