scholarly journals Anisotropic Cu Knight shift and magnetic susceptibility in the normal state of YBa2Cu3O7

1989 ◽  
Vol 39 (1) ◽  
pp. 300-303 ◽  
Author(s):  
M. Takigawa ◽  
P. C. Hammel ◽  
R. H. Heffner ◽  
Z. Fisk ◽  
J. L. Smith ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Normal State ◽  
Knight Shift

Superconductivity and Magnetic Ordering of Pr in CaLa1-xPrxBaCu3O7 System

1997 ◽  
Vol 11 (07) ◽  
pp. 323-331 ◽  
Author(s):  
V. P. S. Awana ◽  
Rajvir Singh ◽  
D. A. Landinez Tellez ◽  
J. M. Ferreira ◽  
J. Albino Aguiar ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Normal State ◽  
Ac Susceptibility ◽  
Magnetic Ordering ◽  
X Ray Diffraction ◽  
X Ray ◽  
Antiferromagnetic Ordering ◽  
Peak Intensity ◽  
Heat Capacity Measurements ◽  
A Minor

We present the results of superconductivity, normal state magnetic susceptibility and heat capacity measurements on the tetragonal CaLa 1-x Pr x BaCu 3 O 7 compound. Ac susceptibility measurements show that the transition temperature T c of the unsubstituted sample decreases with an increase in the Pr concentration. Normal state dc magnetic susceptibility measurements performed in an applied field of 0.5 T show a Curie–Weiss behaviour in terms of the paramagnetic moment of Pr. The effective paramagnetic moment of Pr appears to be intermediate between those of the free Pr 3+ and Pr 4+ ions. For the nonsuperconducting samples i.e., x = 0.70 and 1.0, we observe an antiferromagnetic ordering temperature T N of nearly 4 K and 8 K respectively. The X-ray diffraction results show that the CaPrBaCu 3 O 7 compound is free from other phases, having a minor (less than 8%, in terms of peak intensity) impurity phase. The lower T N (8 K) of PrBaCaCu 3 O 7 as compared to the known antiferromagnetic ordering temperature of 17 K for PrBa 2 Cu 3 O 7 indicates a less deleterious effect of Pr in the present case.

EFFECTIVE P, T RESTORATION IN CHERN–SIMONS SUPERCONDUCTIVITY

1994 ◽  
Vol 08 (08n09) ◽  
pp. 561-570 ◽  
Author(s):  
S. S. MANDAL ◽  
S. RAMASWAMY ◽  
V. RAVISHANKAR
Keyword(s):  
Dielectric Constant ◽  
Magnetic Susceptibility ◽  
Normal State ◽  
Time Reversal ◽  
Finite Temperature ◽  
Narrow Range ◽  
Mean Field ◽  
Smooth Transition ◽  
The Mean ◽  
Chern Simons

We present an analysis of the finite temperature Chern–Simons superconductivity model within the mean field framework. Using analytical and numerical means we compute the changes in the magnetic susceptibility, conductivity, the dielectric constant, and the specific heat as the temperature is increased. Over a narrow range of temperatures the properties of the system show a smooth transition to the normal state. Accompanying this is the near vanishing of the off-diagonal conductivity, signifying the effective restoration of parity and time reversal symmetries.

Knight shift in the normal state and upper critical field curves of V1−xPtx compounds with A-15 structure

Physica B+C ◽  
1978 ◽  
Vol 93 (2) ◽  
pp. 180-194 ◽  
Author(s):  
L.A.G.M. Wulffers ◽  
G.A.M. Frijters ◽  
C.A. van Schie ◽  
T.O. Klaassen ◽  
N.J. Poulis ◽  
...  
Keyword(s):  
Critical Field ◽  
Normal State ◽  
Knight Shift ◽  
Upper Critical Field

Superconductivity and Normal-State Properties of (Y1-x-yZrxCay)Ba2Cu3O7-δ Compounds

1998 ◽  
Vol 12 (28) ◽  
pp. 1175-1183 ◽  
Author(s):  
I. Gr. Deac ◽  
A. V. Pop ◽  
V. Pop ◽  
R. Tetean ◽  
D. Kovacs ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Powder Diffraction ◽  
Normal State ◽  
Lattice Parameters ◽  
Temperature Dependent ◽  
Dopant Content ◽  
X Ray ◽  
Electrical And Magnetic Properties ◽  
Normal State Properties

The electrical and magnetic properties of ( Y 1-x-y Zr x Ca y) Ba 2 Cu 3 O 7-δ ceramics are investigated by using resistivity, ac and dc susceptibility measurements. X-ray powder diffraction has been used to find the lattice parameters of the samples. The samples are orthorhombic, except the sample with x=0.15 and y=0.2 which is tetragonal. All the samples are superconducting. There is no significant change in Tc for the Zr-doped ( Y 1-x Zr x) Ba 2 Cu 3 O 7-δ samples, while for the ( Y 0.85-y Zr 0.15 Ca y) Ba 2 Cu 3 O 7-δ compounds the Tc decrease with the dopant content and they show temperature dependent dc magnetic susceptibility, in the normal state.

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