Low-energy quantum fluctuations and frustrated magnetism in rare-earth-based Shastry-Sutherland lattices: Insights on the CaCo2Al8 structure type antiferromagnets

2021 ◽  
pp. 100552
Author(s):  
Michael O. Ogunbunmi ◽  
André M. Strydom
Keyword(s):  
Rare Earth ◽  
Quantum Fluctuations ◽  
Structure Type ◽  
Low Energy ◽  
Frustrated Magnetism ◽  
Energy Quantum

scholarly journals Direct Drive Applications: Possible Replacement of Rare-Earth Permanent Magnet Motors

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8058
Author(s):  
Chaelim Jeong ◽  
Luca Cinti ◽  
Nicola Bianchi
Keyword(s):  
Rare Earth ◽  
Permanent Magnet ◽  
Low Energy ◽  
Direct Drive ◽  
Permanent Magnet Motors ◽  
Stator Flux ◽  
Type Motor

This paper deals with the possibility to replace rare-earth permanent magnet (PM) motors in direct drive applications. According to previous researches, there are alternatives such as surface-mounted PM motors and spoke-type motors adopting Ferrite PMs, synchronous reluctance motors, with or without the assistance of low-energy PMs. Few studies have been carried out to compare all models at once, thus it is hard to choose which type motor is to be preferred as a valid alternative of rare-earth PM motors in direct drive applications. In this paper, the representative candidates listed above are analyzed and the results are compared with that of a rare-earth PM motor, which is considered as a reference motor. Additionally, the demagnetization phenomenon of the motors with Ferrite PMs is deeply analyzed because this kind of PM may be easily demagnetized by the stator flux. Finally, both strengths and weaknesses of each alternative motors are highlighted.

scholarly journals High-Throughput Screening of Rare-Earth-Lean Intermetallic 1-13-X Compounds for Good Hard-Magnetic Properties

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1096 ◽  
Author(s):  
Georg Krugel ◽  
Wolfgang Körner ◽  
Daniel F. Urban ◽  
Oliver Gutfleisch ◽  
Christian Elsässer
Keyword(s):  
Rare Earth ◽  
High Throughput ◽  
High Throughput Screening ◽  
Spontaneous Magnetization ◽  
Anisotropy Field ◽  
Structure Type ◽  
Anisotropy Constant ◽  
Maximum Energy ◽  
Maximum Energy Product ◽  
Energy Product

By computational high-throughput screening, the spontaneous magnetization M s , uniaxial magnetocrystalline anisotropy constant K 1 , anisotropy field H a , and maximum energy product ( B H ) max are estimated for ferromagnetic intermetallic phases with a tetragonal 1-13-X structure related to the LaCo 9 Si 4 structure type. For SmFe 13 N, a ( B H ) max as high as that of Nd 2 Fe 14 B and a comparable K 1 are predicted. Further promising candidates of composition SmFe 12 AN with A = Co, Ni, Cu, Zn, Ga, Ti, V, Al, Si, or P are identified which potentially reach (BH) max values higher than 400 kJ/m 3 combined with significant K 1 values, while containing almost 50% less rare-earth atoms than Nd 2 Fe 14 B.

scholarly journals Rare-earth Metal Borosilicides R 9 Si15-x B3 (R = Tb, Yb): New Ordered Structures Derived from the AlB2 Structure Type

2020 ◽  
Vol 646 (14) ◽  
pp. 1168-1175
Author(s):  
Volodymyr Babizhetskyy ◽  
Volodymyr Levytskyi ◽  
Régis Jardin ◽  
Josef Bauer ◽  
Roland Guérin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Earth Metal ◽  
Structure Type ◽  
Ordered Structures

ChemInform Abstract: Magnetism and Negative Magnetoresistance of Two Magnetically Ordering, Rare-Earth-Containing Zintl Phases with a New Structure Type: EuGa2Pn2(Pn: P, As).

ChemInform ◽  
2010 ◽  
Vol 41 (2) ◽  
Author(s):  
Andreas M. Goforth ◽  
Haakon Hope ◽  
Cathie L. Condron ◽  
Susan M. Kauzlarich ◽  
Newell Jensen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structure Type ◽  
Negative Magnetoresistance ◽  
Zintl Phases

Crystal chemistry of hydrothermally grown ternary alkali rare earth fluorides

2015 ◽  
Vol 71 (6) ◽  
pp. 768-776 ◽  
Author(s):  
Colin D. McMillen ◽  
Sara Comer ◽  
Kyle Fulle ◽  
Liurukara D. Sanjeewa ◽  
Joseph W. Kolis
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Single Crystals ◽  
Structural Information ◽  
Structure Type ◽  
Crystal Structure Analysis ◽  
Structural Variations ◽  
Ionic Radii ◽  
Wide Range ◽  
Potential Applications

The structural variations of several alkali metal rare earth fluoride single crystals are summarized. Two different stoichiometric formulations are considered, namely those of ARE2F7 and ARE3F10 (A = K, Rb, Cs; RE = Y, La–Lu), over a wide range of ionic radii of both the alkali and rare earth (RE) ions. Previously reported and several new single-crystal structures are considered. The new single crystals are grown using hydrothermal methods and the structures are compared with literature reports of structures grown from both melts and hydrothermal fluids. The data reported here are combined with the literature data to gain a greater understanding of structural subtleties surrounding these systems. The work underscores the importance of the size of the cations to the observed structure type and also introduces synthetic technique as a contributor to the same. New insights based on single-crystal structure analysis in the work introduce a new disordered structure type in the case of ARE2F7, and examine the trends and boundaries of the ARE3F10 stoichiometry. Such fundamental structural information is useful in understanding the potential applications of these compounds as optical materials.

scholarly journals Synthesis of Majorana mass terms in low-energy quantum systems

2018 ◽  
Vol 20 (6) ◽  
pp. 063032
Author(s):  
L Lepori ◽  
A Celi ◽  
A Trombettoni ◽  
M Mannarelli
Keyword(s):  
Quantum Systems ◽  
Low Energy ◽  
Majorana Mass ◽  
Mass Terms ◽  
Energy Quantum

New Quaternary Compounds R3MnAl3Ge2 (R - Rare Earth)

2019 ◽  
Vol 289 ◽  
pp. 21-27
Author(s):  
Natalia Semuso ◽  
Svitlana Pukas ◽  
Yaroslav O. Tokaychuk ◽  
Roman E. Gladyshevskii
Keyword(s):  
Rare Earth ◽  
Earth Metal ◽  
Structure Type ◽  
Hexagonal Structure ◽  
Cell Parameters ◽  
Arc Melting ◽  
Quaternary Compounds ◽  
Pearson Symbol ◽  
The Family ◽  
Trigonal Prismatic Coordination

Nine new quaternaryR3MnAl3Ge2alumogermanides (R= Sm, Gd-Lu) were synthesized by arc melting and their crystal structures were studied by X-ray powder diffraction. All of the compounds crystallize in hexagonal Y3NiAl3Ge2-type structures: Pearson symbolhP9, space groupP-62m. The unit-cell parameters of the isotypic compounds decrease with decreasing radius of the rare-earth metal. The hexagonal structure type Y3NiAl3Ge2(Z= 1) is a quaternary ordering variant of the binary type Fe2P (Z= 3) and the ternary types β1-K2UF6, Lu3CoGa5, Zr3Cu4Si2(Z= 1), ZrNiAl (Z= 3). It belongs to the family of structures with trigonal prismatic coordination of the small atoms.

scholarly journals Causality and universality in low-energy quantum scattering

2009 ◽  
Vol 681 (5) ◽  
pp. 500-503 ◽  
Author(s):  
H.-W. Hammer ◽  
Dean Lee
Keyword(s):  
Low Energy ◽  
Quantum Scattering ◽  
Energy Quantum
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