Unveiled magnetic transition in Na battery material: μ+SR study of P2-Na0.5VO2

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18531-18537 ◽  
Author(s):  
Jun Sugiyama ◽  
Izumi Umegaki ◽  
Daniel Andreica ◽  
Christopher Baines ◽  
Alex Amato ◽  
...  
Keyword(s):  
Muon Spin ◽  
Magnetic Transition ◽  
Battery Material ◽  
Muon Spin Spectroscopy

Muon-spin spectroscopy has clarified that the magnetic transition occurs not at 13 K but at 2 K in P2-Na0.5VO2.

scholarly journals Quantum effects in muon spin spectroscopy within the stochastic self-consistent harmonic approximation

2019 ◽  
Vol 3 (7) ◽  
Author(s):  
Ifeanyi John Onuorah ◽  
Pietro Bonfà ◽  
Roberto De Renzi ◽  
Lorenzo Monacelli ◽  
Francesco Mauri ◽  
...  
Keyword(s):  
Muon Spin ◽  
Harmonic Approximation ◽  
Quantum Effects ◽  
Self Consistent ◽  
Muon Spin Spectroscopy

scholarly journals Static magnetic order in metallic triangular antiferromagnetAg2MnO2detected by muon-spin spectroscopy

2008 ◽  
Vol 78 (10) ◽  
Author(s):  
Jun Sugiyama ◽  
Hiroshi Nozaki ◽  
Yutaka Ikedo ◽  
Kazuhiko Mukai ◽  
Peter L. Russo ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Muon Spin ◽  
Muon Spin Spectroscopy

scholarly journals Mn-induced Fermi-surface reconstruction in the SmFeAsO parent compound

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Meinero ◽  
P. Bonfà ◽  
I. J. Onuorah ◽  
S. Sanna ◽  
R. De Renzi ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Muon Spin ◽  
Magnetic Transition ◽  
Parent Compound ◽  
Density Wave ◽  
Spin Density Wave ◽  
Magnetic Impurities ◽  
Magnetic Fluctuations ◽  
Mn Content ◽  
Electronic Ground

AbstractThe electronic ground state of iron-based materials is unusually sensitive to electronic correlations. Among others, its delicate balance is profoundly affected by the insertion of magnetic impurities in the FeAs layers. Here, we address the effects of Fe-to-Mn substitution in the non-superconducting Sm-1111 pnictide parent compound via a comparative study of SmFe$$_{1-x}$$ 1 - x Mn$$_{x}$$ x AsO samples with $$x(\text{Mn})=$$ x ( Mn ) = 0.05 and 0.10. Magnetization, Hall effect, and muon-spin spectroscopy data provide a coherent picture, indicating a weakening of the commensurate Fe spin-density-wave (SDW) order, as shown by the lowering of the SDW transition temperature $$T_\text{SDW}$$ T SDW with increasing Mn content, and the unexpected appearance of another magnetic order, occurring at $$T^{*} \approx 10$$ T ∗ ≈ 10 and 20 K for $$x=0.05$$ x = 0.05 and 0.10, respectively. We attribute the new magnetic transition at $$T^{*}$$ T ∗ , occurring well inside the SDW phase, to a reorganization of the Fermi surface due to Fe-to-Mn substitutions. These give rise to enhanced magnetic fluctuations along the incommensurate wavevector $$\varvec{Q}_2 =(\pi \pm \delta ,\pi \pm \delta )$$ Q 2 = ( π ± δ , π ± δ ) , further increased by the RKKY interactions among Mn impurities.

scholarly journals Characterization of free radicals in clathrate hydrates of pyrrole, thiophene, and isoxazole by muon spin spectroscopy

2018 ◽  
Vol 96 (2) ◽  
pp. 217-225 ◽  
Author(s):  
Mina Mozafari ◽  
Lalangi Chandrasena ◽  
Iain McKenzie ◽  
Kerim Samedov ◽  
Paul W. Percival
Keyword(s):  
Free Radicals ◽  
Muon Spin ◽  
Carbon Dioxide Sequestration ◽  
Clathrate Hydrates ◽  
Pure Liquid ◽  
Guest Molecules ◽  
Hyperfine Constants ◽  
Potential Applications ◽  
Muon Spin Spectroscopy

Gas hydrates have long been of interest to the petrochemical industry, but there has been growing interest in potential applications for carbon dioxide sequestration and hydrogen storage. This has prompted many fundamental studies of structure and host–guest interactions, but there has been relatively little investigation of chemical reactions of the guest molecules. In previous work, we have shown that it is possible to use muon spin spectroscopy to characterize H atom like muonium and muoniated free radicals formed in clathrate hydrates. Muonium (Mu) forms in clathrate hydrates of cyclopentane and tetrahydrofuran, whereas furan and its dihydro derivatives form radicals. The current work extends studies to clathrates hydrates of other five-membered heterocycles: thiophene, pyrrole, and isoxazole. All form structure II hydrates. In addition to the clathrates, pure liquid samples of the heterocycles were studied to aid in the assignment of radical signals and for comparison with the enclathrated radicals. Similar to furan, two distinct radicals are formed when Mu reacts with thiophene and pyrrole. However, only one muoniated radical was detected from isoxazole. Muon, proton, and nitrogen hyperfine constants were determined and compared with values predicted by DFT calculations to aid the structure assignments. The results show that Mu adds preferentially to the carbon adjacent to the heteroatom in thiophene and pyrrole and to the carbon adjacent to oxygen in isoxazole. The same radicals are formed in clathrates, but the spectra have broader signals, suggesting slower tumbling. Furthermore, additional signals in the avoided level-crossing spectra indicate anisotropy consistent with restricted motion of the radicals in the clathrate cages.

Complex magnetic phases ofCa1−xNaxV2O4clarified by muon-spin spectroscopy

2008 ◽  
Vol 78 (22) ◽  
Author(s):  
Jun Sugiyama ◽  
Yutaka Ikedo ◽  
Tatsuo Goko ◽  
Eduardo J. Ansaldo ◽  
Jess H. Brewer ◽  
...  
Keyword(s):  
Muon Spin ◽  
Magnetic Phases ◽  
Muon Spin Spectroscopy

scholarly journals Detection of Time-Reversal Symmetry Breaking in the Noncentrosymmetric SuperconductorRe6ZrUsing Muon-Spin Spectroscopy

2014 ◽  
Vol 112 (10) ◽  
Author(s):  
R. P. Singh ◽  
A. D. Hillier ◽  
B. Mazidian ◽  
J. Quintanilla ◽  
J. F. Annett ◽  
...  
Keyword(s):  
Symmetry Breaking ◽  
Time Reversal ◽  
Muon Spin ◽  
Time Reversal Symmetry ◽  
Muon Spin Spectroscopy
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