magnetic order
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2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Emre Ergeçen ◽  
Batyr Ilyas ◽  
Dan Mao ◽  
Hoi Chun Po ◽  
Mehmet Burak Yilmaz ◽  
...  

AbstractIn van der Waals (vdW) materials, strong coupling between different degrees of freedom can hybridize elementary excitations into bound states with mixed character1–3. Correctly identifying the nature and composition of these bound states is key to understanding their ground state properties and excitation spectra4,5. Here, we use ultrafast spectroscopy to reveal bound states of d-orbitals and phonons in 2D vdW antiferromagnet NiPS3. These bound states manifest themselves through equally spaced phonon replicas in frequency domain. These states are optically dark above the Néel temperature and become accessible with magnetic order. By launching this phonon and spectrally tracking its amplitude, we establish the electronic origin of bound states as localized d–d excitations. Our data directly yield electron-phonon coupling strength which exceeds the highest known value in 2D systems6. These results demonstrate NiPS3 as a platform to study strong interactions between spins, orbitals and lattice, and open pathways to coherent control of 2D magnets.


2022 ◽  
Vol 1213 (1) ◽  
pp. 012008
Author(s):  
K R Erager ◽  
V V Sokolovskiy ◽  
V D Buchelnikov

Abstract Using ab initio calculations, the phase stability of modulated and tetragonal martensitic structures in Ni43.75Co6.25Mn43.75(In, Sn)6.25 Heusler alloys with different magnetic order is investigated. The stability against the segregation is considered by a method for generating all possible decay reactions assuming the calculated ground state energies of each composition. It is shown that the highest probable stability under equilibrium conditions is demonstrated by alloys with tetragonal martensitic structure in accordance with reactions: Ni35Co5Mn35In5 → 25Mn + 35Ni + 5Mn2InCo and Ni35Co5Mn35Sn5 → 5CoSn + 35Mn + 35Ni.


Author(s):  
Yuwan Wang ◽  
Zichun Cui ◽  
Hanghang Zeng ◽  
Zijie Wang ◽  
Xian Zhang ◽  
...  

The arise of nanoscale spintronics has arouse keen interest in intrinsic ferromagnetism in two-dimensional (2D) materials. The intensive searching for 2D ferromagnets has been mainly focused on the 3d/4d transition...


Author(s):  
Laura C. Folkers ◽  
Laura Teresa Corredor ◽  
Fabian Lukas ◽  
Manaswini Sahoo ◽  
Anja U. B. Wolter ◽  
...  

Abstract MnSb2Te4 is a candidate magnetic topological insulator exhibiting more pronounced cation intermixing than its predecessor MnBi2Te4. Investigating the cation intermixing and its possible implications on the magnetic order in MnSb2Te4 are currently hot topics in research on quantum materials for spintronics and energy-saving applications. Two single-crystal X-ray diffraction measurements of Mn1−x Sb2+x Te4 (x = 0.06 and x = −0.1) are presented alongside a detailed discussion of its crystal structure with a spotlight on the apparent occupancy disorder between the two cations. This disorder has been noted by other groups as well, yet never been analyzed in-depth with single-crystal X-ray diffraction. The latter is the tool of choice to receive a meaningful quantification of antisite disorder. Between the two synthesis procedures we find subtle differences in phases and/or alternation of the cation content which has implications on the magnetic order, as illustrated by bulk magnetometry. Understanding and assessing this disorder in magnetic topological insulators of the MnX2Te4 (X = Bi, Sb) type is crucial to gauge their applicability for modern spintronics. Furthermore, it opens new ways to tune the “chemical composition – physical property” relationship in these compounds, creating an alluring aspect also for fundamental science.


2021 ◽  
Vol 104 (22) ◽  
Author(s):  
Jianjun Tian ◽  
V. N. Ivanovski ◽  
M. Abeykoon ◽  
R. M. Martin ◽  
S. Baranets ◽  
...  

Author(s):  
Dan Sun ◽  
Dmitry Sokolov ◽  
Richard Waite ◽  
Seunghyun Khim ◽  
Pascal Manuel ◽  
...  

Abstract When Heisenberg spins interact antiferromagnetically on a triangular lattice and nearest-neighbor interactions dominate, the ground state is 120◦ antiferromagnetism. In this work, we probe the response of this state to lifting the triangular symmetry, through investigation of the triangular antiferromagnet PdCrO2 under uniaxial stress by neutron diffraction and resistivity measurements. The periodicity of the magnetic order is found to change rapidly with applied stress; the rate of change indicates that the magnetic anisotropy is roughly forty times the stress-induced bond length anisotropy. At low stress, the incommensuration period becomes extremely long, on the order of 1000 lattice spacings; no locking of the magnetism to commensurate periodicity is detected. Separately, the magnetic structure is found to undergo a first-order transition at a compressive stress of ∼0.4 GPa, at which the interlayer ordering switches from a double- to a single-q structure.


Author(s):  
Annette Setzer ◽  
Pablo D. Esquinazi ◽  
Sergei Buga ◽  
Milena Georgieva ◽  
Tilo Reinert ◽  
...  

In this work, we demonstrate that cutting diamond crystals with a laser (532 nm wavelength, 0.5 mJ energy, 200 ns pulse duration at 15 kHz) produces a ≲20nm thick surface layer with magnetic order at room temperature. We have measured the magnetic moment with a SQUID magnetometer of six natural and six CVD diamond crystals of different size, nitrogen content and surface orientations. A robust ferromagnetic response at 300 K is observed only for crystals that were cut with the laser along the (100) surface orientation. The magnetic signals are much weaker for the (110) and negligible for the (111) orientations. We attribute the magnetic order to the disordered graphite layer produced by the laser at the diamond surface. The ferromagnetic signal vanished after chemical etching or after moderate temperature annealing. The obtained results indicate that laser treatment of diamond may pave the way to create ferromagnetic spots at its surface.


Author(s):  
G.Z. Zhou ◽  
J.H. Min ◽  
Y.S. Tang ◽  
X.Y. Chen ◽  
J.W. Gong ◽  
...  

2021 ◽  
Author(s):  
Ola Kenji Forslund ◽  
Daniel Andreica ◽  
Hiroto Ohta ◽  
Masaki Imai ◽  
Chishiro Michioka ◽  
...  

Abstract The ferromagnetic (FM) nature of the metallic LaCo2P2 was investigated with the positive muon spin rotation, relaxation and resonance (μ+SR) technique. Transverse and zero field μ+SR measurements revealed that the compound enters a long range FM ground state at TZFC = 135.00(1) K, consistent with previous studies. Based on the reported FM structure, the internal magnetic field was computed at the muon sites, which were predicted with first principles calculations. The computed result agree well with the experimental data. Moreover, although LaCo2P2 is a paramagnet at higher temperatures T > 160 K, it enters a short range ordered (SRO) magnetic phase for T ZF C < T ≤160 K. Measurements below the vicinity of T ZF C revealed that the SRO phase co-exists with the long range FM order at temperatures 124 K ≤T ≤T ZF C. Such co-existence is an intrinsic property and may be explained by an interplay between spin and lattice degree of freedoms.


2021 ◽  
Vol 104 (20) ◽  
Author(s):  
Xiang Li ◽  
S. E. Cooper ◽  
A. Krishnadas ◽  
A. de la Torre ◽  
R. S. Perry ◽  
...  

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