scholarly journals Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

1997 ◽  
Vol 78 (18) ◽  
pp. 3563-3566 ◽  
Author(s):  
George Balster Martins ◽  
Markus Laukamp ◽  
José Riera ◽  
Elbio Dagotto
Keyword(s):  
Local Enhancement ◽  
Nonmagnetic Impurities ◽  
Antiferromagnetic Correlations

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.

COMPARISON OF THE NMR AND NEUTRON SCATTERING EXPERIMENTS ON CUPRATES WITH NONMAGNETIC IMPURITIES

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3374-3379
Author(s):  
N. BULUT ◽  
U. YAZ
Keyword(s):  
Experimental Data ◽  
Neutron Scattering ◽  
Short Range ◽  
Model Parameters ◽  
Extended Form ◽  
Impurity Potential ◽  
Pure System ◽  
Nonmagnetic Impurities ◽  
Antiferromagnetic Correlations

The NMR and neutron scattering experiments on YBa 2 Cu 3 O 7 with Li and Zn impurities are compared using a simple framework exhibiting short-range antiferromagnetic correlations. The model parameters are determined by fitting the NMR rate [Formula: see text] of the pure system, and the effective impurity potential is approximated by a static extended form. The results of the calculations are compared with the experimental data, and their implications are discussed.

scholarly journals Enhancement of antiferromagnetic correlations induced by nonmagnetic impurities: Origin and predictions for NMR experiments

1998 ◽  
Vol 57 (17) ◽  
pp. 10755-10769 ◽  
Author(s):  
Markus Laukamp ◽  
George Balster Martins ◽  
Claudio Gazza ◽  
André L. Malvezzi ◽  
Elbio Dagotto ◽  
...  
Keyword(s):  
Nonmagnetic Impurities ◽  
Antiferromagnetic Correlations

Spin-disorder state near nonmagnetic impurities in the frustrated antiferromagnet YMnO3

2020 ◽  
Vol 102 (18) ◽  
Author(s):  
Sumin Lim ◽  
Sejun Park ◽  
Soonchil Lee ◽  
Kisoo Park ◽  
Hasung Sim ◽  
...  
Keyword(s):  
Spin Disorder ◽  
Nonmagnetic Impurities

scholarly journals Global-Local Enhancement Network for NMF-Aware Sign Language Recognition

2021 ◽  
Vol 17 (3) ◽  
pp. 1-19
Author(s):  
Hezhen Hu ◽  
Wengang Zhou ◽  
Junfu Pu ◽  
Houqiang Li
Keyword(s):  
Sign Language ◽  
Daily Life ◽  
The Other ◽  
Challenging Problem ◽  
Language Recognition ◽  
Local Enhancement ◽  
Sign Language Recognition ◽  
Vocabulary Size ◽  
Hand Gestures ◽  
Fine Grained

Sign language recognition (SLR) is a challenging problem, involving complex manual features (i.e., hand gestures) and fine-grained non-manual features (NMFs) (i.e., facial expression, mouth shapes, etc .). Although manual features are dominant, non-manual features also play an important role in the expression of a sign word. Specifically, many sign words convey different meanings due to non-manual features, even though they share the same hand gestures. This ambiguity introduces great challenges in the recognition of sign words. To tackle the above issue, we propose a simple yet effective architecture called Global-Local Enhancement Network (GLE-Net), including two mutually promoted streams toward different crucial aspects of SLR. Of the two streams, one captures the global contextual relationship, while the other stream captures the discriminative fine-grained cues. Moreover, due to the lack of datasets explicitly focusing on this kind of feature, we introduce the first non-manual-feature-aware isolated Chinese sign language dataset (NMFs-CSL) with a total vocabulary size of 1,067 sign words in daily life. Extensive experiments on NMFs-CSL and SLR500 datasets demonstrate the effectiveness of our method.

The behavior of magnetic and nonmagnetic impurities in the system Nb76Pt24?x Fe x

1974 ◽  
Vol 17 (3-4) ◽  
pp. 223-246 ◽  
Author(s):  
G. Bongi ◽  
R. Fl�kiger ◽  
A. Treyvaud ◽  
�. Fischer ◽  
H. Jones ◽  
...  
Keyword(s):  
Nonmagnetic Impurities

scholarly journals Local Enhancement of Lipid Membrane Permeability Induced by Irradiated Gold Nanoparticles

ACS Nano ◽  
2017 ◽  
Vol 11 (12) ◽  
pp. 12553-12561 ◽  
Author(s):  
Andrea Torchi ◽  
Federica Simonelli ◽  
Riccardo Ferrando ◽  
Giulia Rossi
Keyword(s):  
Gold Nanoparticles ◽  
Membrane Permeability ◽  
Lipid Membrane ◽  
Local Enhancement
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