Asymmetries in local bonding sites in amorphous semiconductors: very high field NMR of 75As

1998 ◽  
Vol 227-230 ◽  
pp. 770-774 ◽  
Author(s):  
P.C Taylor ◽  
P Hari ◽  
A Kleinhammes ◽  
P.L Kuhns ◽  
W.G Moulton ◽  
...  
Keyword(s):  
High Field ◽  
Amorphous Semiconductors ◽  
Local Bonding ◽  
Very High

Very high field EPR study of a molecular nanomagnet

1998 ◽  
Vol 177-181 ◽  
pp. 709-710 ◽  
Author(s):  
A.L. Barra ◽  
A. Caneschi ◽  
D. Gatteschi ◽  
R. Sessoli
Keyword(s):  
High Field ◽  
Very High

scholarly journals Very-high-field n.m.r. studies of bovine lung heparan sulphate oligosaccharides produced by nitrous acid deaminative cleavage. 13C-n.m.r. study of methylene resonances: degree and positions of C-6 sulphation

1983 ◽  
Vol 211 (3) ◽  
pp. 677-682 ◽  
Author(s):  
P N Sanderson ◽  
I A Nieduszynski ◽  
T N Huckerby
Keyword(s):  
Nitrous Acid ◽  
High Field ◽  
Uronic Acid ◽  
Glucuronic Acid ◽  
General Structure ◽  
Heparan Sulphate ◽  
Glcnac Residue ◽  
Very High

Oligosaccharides with the general structure UA-(GlcNAc-GlcUA-)m-aManOH (m = 1-5) (where UA represents uronic acid, GlcNAc N-acetylglucosamine, GlcUA glucuronic acid and aManOH anhydromannitol) were prepared from low-sulphated heparan sulphates of bovine lung origin by nitrous acid deaminative cleavage followed by reduction. Analysis of the methylene signals in the 100 MHz 13C-n.m.r. spectrum of the tetrasaccharide (m = 1) shows that, whereas the extent of C-6 O-sulphation in the GlcNAc is approx. 65%, in the aManOH [formerly a GlcNSO3 (N-sulphoglucosamine) residue in the parent heparan sulphate] it is only approx. 10%. In the higher oligosaccharides (m = 2-5) the gross extent of C-6 O-sulphation of GlcNAc residues falls systematically with increasing oligosaccharide size, whereas that in the aManOH residues remains below 10%. There is also evidence that the C-6 O-sulphation of the GlcNAc residues is confined to the GlcNAc residue adjacent to the non-reducing terminal uronic acid residue. It is therefore tentatively proposed that the GlcNAc in the sequence -GlcNSO3-UA-GlcNAc- might be a favoured substrate for the 6-O-sulphotransferase. It is concluded that in the low-sulphated heparan sulphates GlcNSO3 residues that do not occur in (GlcNSO3-UA-)n blocks tend to have a significantly smaller extent of C-6 O-sulphation than do GlcNAc residues that occur in -GlcNSO3-UA-GlcNAc-GlcUA-GlcNSO3-sequences.

MAGNETIC STUDIES OF SUPERCONDUCTING GdBa2Cu3O6+δ AT LOW TEMPERATURE AND HIGH FIELD

1987 ◽  
Vol 01 (05n06) ◽  
pp. 245-250 ◽  
Author(s):  
C.Y. HUANG ◽  
Y. SHAPIRA ◽  
P.H. HOR ◽  
R.L. MENG ◽  
C.W. CHU
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
High Magnetic Field ◽  
High Field ◽  
Paramagnetic Phase ◽  
Néel Temperature ◽  
Magnetic Studies ◽  
Spin Subsystem ◽  
Very High ◽  
Canted Phase

The magnetization of antiferromagnetic superconducting GdBa2Cu3O6+δ has been measured for ~1.5<T≤4.2 K for field up to ~20 T. We found that all Gd3+ spins are nearly parallel at very high field, and that this saturated spin subsystem coexists with superconductivity. Below the Néel temperature, 2.22 K, we observed the transition from the “canted” phase to the paramagnetic phase by the application of a high magnetic field.

Optimized very high field tape wound split superconductive magnets

1972 ◽  
Vol 8 (3) ◽  
pp. 635-637
Author(s):  
T. Haller ◽  
E. Schrader ◽  
E. Mains
Keyword(s):  
High Field ◽  
Very High

High-Field Giant Magnetoresistance in Co-Cu Superlattices

1993 ◽  
Vol 313 ◽  
Author(s):  
Darryl Barlett ◽  
Frank Tsui ◽  
Lincoln Lauhon ◽  
Tushar Mandrekar ◽  
Ohrad Uher ◽  
...  
Keyword(s):  
High Field ◽  
Giant Magnetoresistance ◽  
Granular Systems ◽  
Switching Field ◽  
Present Evidence ◽  
Conduction Electrons ◽  
New Type ◽  
High Fields ◽  
Very High ◽  
Cobalt Copper

ABSTRACTWe present evidence for a new type of giant magnetoresistance in (111) cobalt-copper superlattices with atomically smooth interfaces. We propose that the lowered dimensionality of the structure leads to an enhancement of the scattering of conduction electrons from paramagnetic interfaces obeying a Langevin-like saturation at very high fields, well beyond the switching field of the Co layers. The findings help to explain similarities in magnetotransport behavior with recently reported granular systems as well as differences with antiferromagnetically coupled Multilayers.

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