Spin Dynamics in the Metallic State of YBa2(Cu0.98 Zn0.02) 3O6+x

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3330-3334 ◽  
Author(s):  
Y. Sidis ◽  
P. Bourges ◽  
B. Hennion ◽  
R. Villeneuve ◽  
G. Collin ◽  
...  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Low Energy ◽  
Metallic State ◽  
Magnetic Fluctuations ◽  
Local Enhancement ◽  
Compound I ◽  
Nonmagnetic Impurities

Inelastic neutron scattering measurements have been carried out on a YBa2(Cu0.98-Zn0.02)3O 6+x single crystal in both underdoped (x = 0.7) and overdoped (x = 0.97) regimes. In the zinc substituted system, spin dynamics is drastically changed in respect to the pure compound: (i) the "resonance peak" almost vanishes, (ii) the spin gap is filled, (iii) new antiferromagnetic excitations are found at low energy. These new magnetic fluctuations, which persist in the normal state, account for a local enhancement of AF correlations around nonmagnetic impurities. Besides, it is worth emphasizing that features, not directly related to superconductivity, i.e., the contribution to the spin dynamics apart from the resonance peak and the "spin pseudo-gap" observed in the underdoped regime above T c , coexist with the new low energy magnetic fluctuations.

scholarly journals Spin dynamics of molecular nanomagnets unravelled at atomic scale by four-dimensional inelastic neutron scattering

2012 ◽  
Vol 8 (12) ◽  
pp. 906-911 ◽  
Author(s):  
Michael L. Baker ◽  
Tatiana Guidi ◽  
Stefano Carretta ◽  
Jacques Ollivier ◽  
Hannu Mutka ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Inelastic Neutron ◽  
Atomic Scale ◽  
Molecular Nanomagnets

Inelastic neutron scattering and low-energy excitation of amorphous SF6 hydrate prepared by vapor-deposition technique

2003 ◽  
Vol 81 (1-2) ◽  
pp. 107-114 ◽  
Author(s):  
O Yamamuro ◽  
T Matsuo ◽  
I Tsukushi ◽  
N Onoda-Yamamuro
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Annealed Sample ◽  
Low Energy ◽  
Energy Excitation ◽  
Hydrogen Bond Formation ◽  
Crystalline Sample ◽  
Two Samples ◽  
Vapor Deposition Technique

Amorphous SF6 hydrate (SF6·17H2O) was prepared by depositing the mixed vapor onto a substrate kept at about 8 K. The inelastic neutron-scattering spectra of the as-deposited sample and those annealed at about 120 and 150 K were measured at 50 K in the energy range below 100 meV. The first two samples were considered to be in amorphous states while the third one was in a crystalline state. The librational frequency of the water molecule (at around 60 meV) is smaller in the order of (as-deposited sample) < (annealed sample) < (crystalline sample). This indicates that the strength of the intermolecular hydrogen bonds is (crystalline sample) > (annealed sample) > (as-deposited sample). The spectra below 10 meV were compared with our previous data of pure vapor-deposited amorphous ices and those doped with methanol (CD3OH). The low-energy excitation (E < 6 meV) differed drastically depending on the dopants, i.e., the scattering intensity was enhanced by methanol doping but reduced by SF6 doping. This may be because the hydrogen-bond formation was hindered by methanol doping but promoted rather more by SF6 doping because of the hydrophobic interaction as in clathrate hydrates. PACS Nos.: 61.12Ex, 63.50tx

Interplay Of Superconductivity And Magnetic Excitations In Multiorbital Systems

2015 ◽  
Vol 10 (2) ◽  
pp. 83-90
Author(s):  
Maxim Korshunov ◽  
Yuliya Togushova
Keyword(s):  
Experimental Data ◽  
Magnetic Susceptibility ◽  
Order Parameter ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Resonance Peak ◽  
Superconducting Order Parameter ◽  
Spin Resonance ◽  
Iron Based ◽  
The Impact

We have considered the impact of the nontrivial superconducting order parameter on the magnetic susceptibility within the multiorbital model for the iron-based materials. The formation of the spin-resonance peak is demonstrated and its connection to the experimental data on the inelastic neutron scattering is discussed.

scholarly journals Decay and renormalization of a longitudinal mode in a quasi-two-dimensional antiferromagnet

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Seung-Hwan Do ◽  
Hao Zhang ◽  
Travis J. Williams ◽  
Tao Hong ◽  
V. Ovidiu Garlea ◽  
...  
Keyword(s):  
Inelastic Neutron Scattering ◽  
Longitudinal Mode ◽  
Wave Theory ◽  
Inelastic Neutron ◽  
Low Energy ◽  
Many Body ◽  
Longitudinal Modes ◽  
Quantum Magnet ◽  
Energy Mode ◽  
The Many

AbstractAn ongoing challenge in the study of quantum materials, is to reveal and explain collective quantum effects in spin systems where interactions between different modes types are important. Here we approach this problem through a combined experimental and theoretical study of interacting transverse and longitudinal modes in an easy-plane quantum magnet near a continuous quantum phase transition. Our inelastic neutron scattering measurements of Ba2FeSi2O7 reveal the emergence, decay, and renormalization of a longitudinal mode throughout the Brillouin zone. The decay of the longitudinal mode is particularly pronounced at the zone center. To account for the many-body effects of the interacting low-energy modes in anisotropic magnets, we generalize the standard spin-wave theory. The measured mode decay and renormalization is reproduced by including all one-loop corrections. The theoretical framework developed here is broadly applicable to quantum magnets with more than one type of low energy mode.

Inelastic neutron scattering study of low-energy excitations in vapor-deposited glassy propylene

1997 ◽  
Vol 106 (8) ◽  
pp. 2997-3002 ◽  
Author(s):  
Osamu Yamamuro ◽  
Itaru Tsukushi ◽  
Takasuke Matsuo ◽  
Kiyoshi Takeda ◽  
Toshiji Kanaya ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Low Energy ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Narayan Mohanta ◽  
Andrew D. Christianson ◽  
Satoshi Okamoto ◽  
Elbio Dagotto
Keyword(s):  
Spin Wave ◽  
Magnetic Order ◽  
Inelastic Neutron Scattering ◽  
Spin Dynamics ◽  
Wave Spectrum ◽  
Exchange Interactions ◽  
Inelastic Neutron ◽  
Spin Wave Excitations ◽  
Crystal Transition ◽  
Dynamics Simulations

AbstractUnderstanding the spin-wave excitations of chiral magnetic order, such as the skyrmion crystal (SkX), is of fundamental interest to confirm such exotic magnetic order. The SkX is realized by competing Dzyaloshinskii-Moriya and ferromagnetic-exchange interactions with a magnetic field or anisotropy. Here, we compute the dynamical spin structure factor, using Monte Carlo and spin dynamics simulations, extracting the spin-wave spectrum in the SkX, in the vicinity of the paramagnet to SkX transition. Inside the SkX, we find six spin-wave modes, which are supplemented by another mode originating from the ferromagnetic background. Above the critical temperature Ts for the skyrmion crystallization, we find a diffusive regime, reminiscent of the liquid-to-crystal transition, revealing that topological spin texture of skyrmionic character starts to develop above Ts as the precursor of the SkX. We discuss the opportunities for the detection of the spin waves of the SkX using inelastic-neutron-scattering experiments in manganite-iridate heterostructures.

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