Effect of superconducting fluctuations on63Cu NQR-NMR relaxation in YBa2Cu3O7

1997 ◽  
Vol 19 (8-9) ◽  
pp. 1131-1136 ◽  
Author(s):  
P. Carretta ◽  
A. Rigamonti ◽  
D. V. Livanov ◽  
A. A. Varlamov
Keyword(s):  
Nmr Relaxation ◽  
Superconducting Fluctuations

Effect of superconducting fluctuations on spin susceptibility and NMR relaxation rate

1994 ◽  
Vol 50 (14) ◽  
pp. 10401-10404 ◽  
Author(s):  
Mohit Randeria ◽  
Andrei A. Varlamov
Keyword(s):  
Relaxation Rate ◽  
Nmr Relaxation ◽  
Spin Susceptibility ◽  
Superconducting Fluctuations

Effects of Superconducting Fluctuations on NMR Relaxation Rate

1989 ◽  
Vol 58 (2) ◽  
pp. 376-379 ◽  
Author(s):  
Kazuhiro Kuboki ◽  
Hidetoshi Fukuyama
Keyword(s):  
Relaxation Rate ◽  
Nmr Relaxation ◽  
Superconducting Fluctuations

Superconducting fluctuations andCu63NQR-NMR relaxation inYBa2Cu3O7−δ: Effect of magnetic field and a test for the pairing-state symmetry

1996 ◽  
Vol 54 (14) ◽  
pp. R9682-R9685 ◽  
Author(s):  
P. Carretta ◽  
D. V. Livanov ◽  
A. Rigamonti ◽  
A. A. Varlamov
Keyword(s):  
Magnetic Field ◽  
Nmr Relaxation ◽  
Pairing State ◽  
Superconducting Fluctuations

Mononucleotides 31P NMR relaxation measurement

1983 ◽  
Vol 80 ◽  
pp. 831-832 ◽  
Author(s):  
A.M. Avedikian ◽  
D. Besserre ◽  
M. Delepierre
Keyword(s):  
31P Nmr ◽  
Nmr Relaxation ◽  
Relaxation Measurement

Analysis of the backbone dynamics of capsicein using 15N NMR relaxation rate measurements

1994 ◽  
Vol 91 ◽  
pp. 776-784
Author(s):  
C van Heijenoort ◽  
S Bouaziz ◽  
E Guittet
Keyword(s):  
Relaxation Rate ◽  
Nmr Relaxation ◽  
Backbone Dynamics ◽  
15N Nmr ◽  
15N Nmr Relaxation

1H-NMR RELAXATION STUDIES ON THE NATURE OF THE SEMICONDUCTING STATE OF (TMTTF)2Br AND (TMTTF)2PF6: MAGNETISM

1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1095-C3-1097
Author(s):  
T. Takahashi ◽  
F. Creuzet ◽  
D. Jérôme ◽  
J. M. Fabre
Keyword(s):  
1H Nmr ◽  
Nmr Relaxation ◽  
Relaxation Studies

Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated Using NMR Relaxation and Atomistic Molecular Dynamics Simulations

2019 ◽  
Author(s):  
Allison Edwards ◽  
Abdolreza Javidialesaadi ◽  
Katie Weigandt ◽  
George Stan ◽  
Charles Eads
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Nmr Relaxation ◽  
Cross Relaxation ◽  
Relaxation Rates ◽  
Surfactant Micelles ◽  
Cylindrical Micelles ◽  
Spherical Micelles ◽  
Dynamics Simulations ◽  
Relative Motions

We study molecular arrangements and dynamics in alkyl ethoxylate nonionic surfactant micelles by combining high field (600 and 700 MHz) NMR relaxation measurements with large-scale atomistic molecular dynamics simulations. For spherical micelles, but not for cylindrical micelles, cross relaxation rates are positive only for surfactant alkyl tail atoms connected to the hydrophilic head group. All cross relaxation rates are negative for cylindrical micelles. This effect is reproducible either by changing composition (ratios of the nonionic surfactants) or changing temperature of a single surfactant in order to change the micelle shape. We validate the micelle shape by SANS and use the results as a guide for our simulations. We calculate parameters that determine relaxation rates directly from simulated trajectories, without introducing specific functional forms. Results indicate that relative motions of nearby atoms are liquid-like, in agreement with 13C T1 measurements, though constrained by micelle morphology. Relative motions of distant atoms have slower components because the relative changes in distances and angles are smaller when the moving atoms are further apart. The slow, long-range motions appear to be responsible for the predominantly negative cross relaxation rates observed in NOESY spectra. The densities of atoms from positions 1 and 2 in the boundary region are lower in spherical micelles compared to cylindrical micelles. Correspondingly, motions in this region are less constrained by micelle morphology in the spherical compared to the cylindrical cases. The two effects of morphology lead to the unusual occurrence of positive cross relaxation involving positions 1 and 2 for spheres.

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