scholarly journals Calculation of Nuclear Contribution to the Zero-field Muon Spin Polarization Function of Single Crystal La2-XSrXCuO4

2012 ◽  
Vol 30 ◽  
pp. 129-132
Author(s):  
W. Huang ◽  
V. Pacradouni ◽  
J.E. Sonier
Keyword(s):  
Single Crystal ◽  
Spin Polarization ◽  
Muon Spin ◽  
Zero Field ◽  
Polarization Function ◽  
Nuclear Contribution

Zero-Field Muon Spin Rotation Studies in (TMTSF) 2 PF 6

1991 ◽  
Vol 15 (5) ◽  
pp. 547-552 ◽  
Author(s):  
L. P Le ◽  
G. M Luke ◽  
B. J Sternlieb ◽  
W. D Wu ◽  
Y. J Uemura ◽  
...  
Keyword(s):  
Muon Spin ◽  
Spin Rotation ◽  
Muon Spin Rotation ◽  
Zero Field

scholarly journals Influence of Crystallite Size on the Magnetic Order in Semiconducting ZnCr2Se4 Nanoparticles

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3947 ◽  
Author(s):  
Ewa Malicka ◽  
Małgorzata Karolus ◽  
Tadeusz Groń ◽  
Adrian Gudwański ◽  
Andrzej Ślebarski ◽  
...  
Keyword(s):  
Single Crystal ◽  
Specific Heat ◽  
Spin Glass ◽  
Crystallite Size ◽  
Magnetic Order ◽  
Ac Susceptibility ◽  
High Energy ◽  
Zero Field ◽  
Bulk Single Crystal ◽  
Field Cooling

Structural, electrical, magnetic, and specific heat measurements were carried out on ZnCr2Se4 single crystal and on nanocrystals obtained from the milling of this single crystal after 1, 3, and 5 h, whose crystallite sizes were 25.2, 2.5, and 2 nm, respectively. For this purpose, the high-energy ball-milling method was used. The above studies showed that all samples have a spinel structure, and are p-type semiconductors with less milling time and n-type with a higher one. In turn, the decrease in crystallite size caused a change in the magnetic order, from antiferromagnetic for bulk material and nanocrystals after 1 and 3 h of milling to spin-glass with the freezing temperature Tf = 20 K for the sample after 5 h of milling. The spin-glass behavior for this sample was derived from a broad peak of dc magnetic susceptibility, a splitting of the zero-field-cooling and field-cooling susceptibilities, and from the shift of Tf towards the higher frequency of the ac susceptibility curves. A spectacular result for this sample is also the lack of a peak on the specific heat curve, suggesting a disappearance of the structural transition that is observed for the bulk single crystal.

Negative muon spin rotation studies on single crystal La2CuO4+δ above TN

1991 ◽  
Vol 185-189 ◽  
pp. 1087-1088 ◽  
Author(s):  
Hideaki Kitazawa ◽  
Eiko Torikai ◽  
Kusuo Nishiyama ◽  
Kanetada Nagamine ◽  
Fumitoshi Iga ◽  
...  
Keyword(s):  
Single Crystal ◽  
Muon Spin ◽  
Spin Rotation ◽  
Muon Spin Rotation ◽  
Negative Muon

scholarly journals Solute-Vacancy Clustering In Al-Mg-Si Alloys Studied By Muon Spin Relaxation Technique

2015 ◽  
Vol 60 (2) ◽  
pp. 925-929 ◽  
Author(s):  
K. Nishimura ◽  
K. Matsuda ◽  
R. Komaki ◽  
N. Nunomra ◽  
S. Wenner ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Spin Relaxation ◽  
Muon Spin ◽  
Muon Spin Relaxation ◽  
Zero Field ◽  
Temperature Variations ◽  
Vacancy Clusters ◽  
Relaxation Functions ◽  
Similar Temperature ◽  
Relaxation Experiments

Abstract Zero-field muon spin relaxation experiments were carried out with Al-1.6%Mg2Si, Al-0.5%Mg, and Al-0.5%Si alloys. Observed relaxation spectra were compared with the calculated relaxation functions based on the Monte Carlo simulation to extract the dipolar width (Δ), trapping (νt), and detrapping rates (νd), with the initially trapped muon fraction (P0). The fitting analysis has elucidated that the muon trapping rates depended on the heat treatment and solute concentrations. The dissolved Mg in Al dominated the νt at lower temperatures below 120 K, therefore the similar temperature variations of νt were observed with the samples mixed with Mg. The νt around 200 K remarkably reflected the heat treatment effect on the samples, and the largest νt value was found with the sample annealed at 100°C among Al-1.6%Mg2Si alloys. The as-quenched Al-0.5%Si sample showed significant νt values between 80 and 280 K relating with Si-vacancy clusters, but such clusters disappeared with the natural aged Al-0.5%Si sample.

scholarly journals Low-T magnetic anomaly in Ca2Fe2O5studied by single-crystal neutron diffraction

2014 ◽  
Vol 70 (a1) ◽  
pp. C1352-C1352
Author(s):  
Josie Auckett ◽  
Garry McIntyre ◽  
Maxim Avdeev ◽  
Hank De Bruyn ◽  
Chris Ling
Keyword(s):  
Magnetic Susceptibility ◽  
Single Crystal ◽  
Temperature Interval ◽  
Diffraction Data ◽  
Room Temperature ◽  
Statistical Significance ◽  
Spin Reorientation ◽  
Careful Examination ◽  
Zero Field ◽  
Zone Method

Ca2Fe2O5, which belongs to the Brownmillerite family of promising solid-oxide fuel cell membrane materials, is an antiferromagnet (AFM) below TN = 720 K. A small ferromagnetic (FM) canting perpendicular to the AFM easy axis has previously been established by physical properties measurements, but never observed crystallographically. More intriguingly, it has been known for some time to display an anomalous elevation in magnetic susceptibility for 60 K < T < 140 K. [1] Based on measurements performed with small oriented single crystals, Zhou et al. [2] proposed that this anomaly was due to a reorientation of the spins from the crystallographic a axis to the c axis below 40 K, with a region of minimal magnetocrystalline anisotropy in the anomalous temperature interval. In order to test this, we grew a very large (~1 cm3) single crystal by the floating-zone method and collected neutron Laue diffraction data, against which we refined both the atomic and magnetic structures of Ca2Fe2O5 between 10 K and 300 K. We designed and built an ad hoc sample mount to apply a small (~35 Oe) magnetic field to the sample, ensuring perfect consistency with the magnetic susceptibility data, which were collected in a comparably small field. Our refinements against both zero-field and in-field diffraction data reproduce the G-type AFM structure of Ca2Fe2O5 excellently at room temperature, including the FM canting which we have refined to statistical significance for the first time. We can also show that in the intermediate temperature interval (T = 100 K), the spins are slightly less well-ordered due to competing sublattice interactions. However, careful examination of the data reveals that the material is still best described by the room-temperature magnetic structure at all measured temperatures – i.e., the spin-reorientation hypothesis is incorrect.

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