63,65Cu NMR and NQR in YBa2Cu3O7-δ

1987 ◽  
Vol 99 ◽  
Author(s):  
W. W. Warren ◽  
R. E. Walstedt ◽  
R. F. Bell ◽  
G. F. Brennert ◽  
R. J. Cava ◽  
...  
Keyword(s):  
Superconducting State ◽  
High Field ◽  
Nuclear Relaxation ◽  
Relaxation Rates ◽  
Structural Units ◽  
Nmr Spectrum ◽  
Electron Pairing

ABSTRACTNMR and NQR results are reported for 63,65Cu in YBa2Cu3O7-δ. Analysis of the high-field NMR spectrum indicates substantial disorder in the copper-oxygen planes. Nuclear relaxation rates are significantly different for copper in the chains and planes both above and below Tc and yield sharply different electron pairing energies on these structural units in the superconducting state.

scholarly journals Evidence for Spin-Triplet Electron Pairing in the Proximity-Induced Superconducting State of an Fe-Doped InAs Semiconductor

2019 ◽  
Vol 122 (10) ◽  
Author(s):  
Taketomo Nakamura ◽  
Le Duc Anh ◽  
Yoshiaki Hashimoto ◽  
Shinobu Ohya ◽  
Masaaki Tanaka ◽  
...  
Keyword(s):  
Superconducting State ◽  
Electron Pairing ◽  
Spin Triplet

HIGH FIELD PHASE DIAGRAM OF THE FIELD-INDUCED SUPERCONDUCTING STATE OF λ-(BETS)2FeCl4

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3101-3104
Author(s):  
L. BALICAS ◽  
J. S. BROOKS ◽  
K. STORR ◽  
S. UJI ◽  
M. TOKUMOTO ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Superconducting State ◽  
Ground State ◽  
Electrical Transport ◽  
High Field ◽  
Two Dimensional ◽  
Exchange Field ◽  
Organic Conductor ◽  
Field Phase ◽  
Antiferromagnetic Ground State

We investigate by electrical transport the field-induced superconducting state (FISC) in the organic conductor λ- (BETS) 2 FeCl 4. Below 4 K, antiferromagnetic-insulator, metallic, and eventually superconducting (FISC) ground states are observed with increasing in-plane magnetic field. The FISC state survives between 18 and 41 T, and can be interpreted in terms of the Jaccarino-Peter effect, where the external magnetic field compensates the exchange field of aligned Fe 3+ ions. We further argue that the Fe 3+ moments are essential to stabilize the resulting singlet, two-dimensional superconducting state. Here we provide experimental evidence indicating that this state, as well as the insulating antiferromagnetic ground state, is extremely sensitive to hydrostatic pressure.

scholarly journals Properties of the cupric sites in bovine superoxide dismutase studied by nuclear-magnetic-relaxation measurements

1979 ◽  
Vol 177 (1) ◽  
pp. 303-309 ◽  
Author(s):  
N Boden ◽  
M C Holmes ◽  
P F Knowles
Keyword(s):  
Superoxide Dismutase ◽  
Water Molecule ◽  
Magnetic Relaxation ◽  
Nuclear Relaxation ◽  
Histidine Residue ◽  
Relaxation Rates ◽  
Cyanide Concentration ◽  
Relaxation Measurements ◽  
Bovine Erythrocytes ◽  
Frequency Temperature

Proton nuclear-relaxation rates have been measured as a function of frequency, temperature, pH and cyanide concentration in aqueous solutions of superoxide dismutase from bovine erythrocytes. The results show that, whereas for pH less than or equal to 9 only one water molecule is bound to each Cu2+ ion, at higher pH a second co-ordination site for OH- becomes available; it is proposed that this involves cleavage of the bond between Cu2+ and the histidine residue that bridges to Zn2+.

Influence of copper(II) on proton nuclear relaxation rates of poly-L-histidine

1977 ◽  
Vol 99 (8) ◽  
pp. 2480-2482 ◽  
Author(s):  
Roderick E. Wasylishen ◽  
Jack S. Cohen
Keyword(s):  
Nuclear Relaxation ◽  
Relaxation Rates

NMR IN FeNi/Co FILMS WITH COUPLED LAYERS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 511-513 ◽  
Author(s):  
N. A. LESNIK ◽  
V. O. GOLUB
Keyword(s):  
Layer Thickness ◽  
Enhancement Factor ◽  
Room Temperature ◽  
Spin Echo ◽  
Anisotropy Field ◽  
Nuclear Relaxation ◽  
Relaxation Rates ◽  
Field Change ◽  
Induced Anisotropy ◽  
Spin Echo Technique

The observation of NMR on Co 59 nuclei in vacuum evaporated FeNi/Co films using spin-echo technique at room temperature is reported. The effect of layer interaction upon the enhancement factor and the nuclear relaxation rates have been found. Both the parameters and the induced anisotropy field decreased with the Co layer thickness decreasing. The obtained results are discussed. It seems the anistropy field change to be the main source of the observed NMR parameter behaviour.

scholarly journals Nuclear relaxation rates at copper and oxygen sites in YBa 2 Cu 3 O 7

1989 ◽  
Vol 162-164 ◽  
pp. 177-178 ◽  
Author(s):  
P.C. Hammel ◽  
M. Takigawa ◽  
R.H. Heffner ◽  
Z. Fisk ◽  
K.C. Ott
Keyword(s):  
Nuclear Relaxation ◽  
Relaxation Rates
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