Correlation between superconducting critical temperature and normal-state resistivity parameters from the codopedErBa2Cu3−x−yZnxFeyO7−δsystem

2000 ◽  
Vol 61 (17) ◽  
pp. 11752-11761 ◽  
Author(s):  
Anurag Gupta ◽  
Ratan Lal ◽  
A. Sedky ◽  
A. V. Narlikar ◽  
V. P. S. Awana
Keyword(s):  
Critical Temperature ◽  
Normal State ◽  
Normal State Resistivity

A POSSIBLE CORRELATION BETWEEN SUPPRESSION OF SUPERCONDUCTIVITY, MAGNETIC ORDERING AND NORMAL STATE RESISTIVITY PARAMETERS IN THE Yb1-xPrxBa2Cu3O7-δ SYSTEM

2002 ◽  
Vol 16 (08) ◽  
pp. 261-273 ◽  
Author(s):  
ANURAG GUPTA ◽  
H. NARAYAN ◽  
P. N. LISBOA-FILHO ◽  
C. A. CARDOSO ◽  
FERNANDO M. ARAUJO MOREIRA ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Normal State ◽  
Magnetic Ordering ◽  
Residual Resistivity ◽  
Gradual Decrease ◽  
Normal State Resistivity ◽  
Characteristic Temperatures ◽  
Antiferromagnetic Ordering ◽  
Diamagnetic Transition ◽  
The Difference

Polycrystalline samples of the Pr doped Yb 1-x Pr x Ba 2 Cu 3 O 7-δ (i.e. Yb(Pr)-123) system for 0≤x≤1 have been investigated for resistivity ρ and magnetization M as a function of temperature in normal and superconducting states. The gradual decrease in superconducting critical temperature T c (x) is found to be correlated with the x-dependent ratio of resistivity slope (dρ/dT) cc (corresponding to the linear ρ(T) region) and residual resistivity ρ0. In particular, the observed difference of critical Pr concentration where superconductivity is destroyed (x c ) in Yb(Pr)-123 (x c ≈ 0.65) and Y(Pr)-123 (x c ≈ 0.55) matches with the difference in the value of Pr concentration where the ratio (dρ/dT) cc /ρ0 tends to go to zero in them. The M(T) data of the Yb(Pr)-123 samples show magnetic ordering for x > x c at characteristic temperatures, Tn, that increase with x. Interestingly, the Yb(Pr)-123 sample with Pr content (x = 0.6) near x c reveals several anomalous features like transition from metallic to semiconducting-like ρ(T), an excessive broadening of the diamagnetic transition and weakening of the M(T) signal related to antiferromagnetic ordering of Pr ions. These observations can be consistently interpreted by assuming the presence of dynamically fluctuating striped phase in these systems.

scholarly journals Zinc Nanoparticles at Intercrystallite Sites of (Cu0.5Tl0.5)Ba2Ca3Cu4O12−δSuperconductor

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Irfan Qasim ◽  
M. Mumtaz ◽  
K. Nadeem ◽  
S. Qamar Abbas
Keyword(s):  
Crystal Structure ◽  
Critical Temperature ◽  
Solid State ◽  
Cross Section ◽  
Normal State ◽  
Superconducting Properties ◽  
Normal State Resistivity ◽  
Solid State Reaction Technique ◽  
Zinc Nanoparticles ◽  
Zn Nanoparticles

We synthesizedZnx/(Cu0.5Tl0.5)Ba2Ca3Cu4O12-δ  {Znx/CuTl-1234}(x= 0~3 wt.%)nanoparticles-superconductor composites by solid-state reaction technique and examined the effects of zinc (Zn) nanoparticles on structural and superconducting properties of CuTl-1234 phase. Unaltered crystal structure of host CuTl-1234 phase confirmed the existence of Zn nanoparticles at intercrystallite sites. We observed an improvement in grains size and intergrains connectivity by healing up the voids after incorporation of Zn nanoparticles in CuTl-1234 superconductor. Superconducting properties ofZnx/CuTl-1234 composites were suppressed for all Zn nanoparticles concentrations. Suppression of zero resistivity critical temperature{Tc(0)}and variation in normal state resistivity{ρ300 K (Ω-cm)}were attributed to reduction of superconducting volume fractions and enhanced scattering cross section of mobile carriers.

Systematic variation for the temperature dependence of normal-state resistivity in (La1−xBax)2CuO4 system

1991 ◽  
Vol 185-189 ◽  
pp. 1239-1240 ◽  
Author(s):  
Shoichi Nagata ◽  
Mikio Nakajima ◽  
Kan-ichi Kido ◽  
Toshimi Ikeda ◽  
Susumu Chikazawa
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Systematic Variation ◽  
Normal State Resistivity

Thin amorphous superconducting niobium-silicon films with high normal state resistivity

1990 ◽  
Vol 165-166 ◽  
pp. 1525-1526 ◽  
Author(s):  
H.S.J. van der Zant ◽  
J.F. Jongste ◽  
H.W. Zandbergen ◽  
J.E. Mooij
Keyword(s):  
Normal State ◽  
Silicon Films ◽  
Normal State Resistivity

Superconducting (YBaCuO)–(CuO)–Ag composites

1989 ◽  
Vol 4 (4) ◽  
pp. 802-805 ◽  
Author(s):  
Yi Song ◽  
Yue Cao ◽  
Anupam Misra ◽  
J. R. Gaines
Keyword(s):  
Mechanical Properties ◽  
Critical Current Density ◽  
Copper Oxide ◽  
Current Density ◽  
Normal State ◽  
Liquid Nitrogen Temperature ◽  
Substantial Improvement ◽  
Metallic Silver ◽  
Normal State Resistivity ◽  
Ceramic Superconductors

We have fabricated superconducting composites composed of Y1Ba2Cu3O7–δ, copper oxide, and metallic silver. Sharp superconducting transitions were observed well above the liquid nitrogen temperature. The normal state resistivity of these composites was much lower than that of the pure ceramic Y1Ba2Cu3O7–δ. The critical current density was measured and it was comparable to that of ceramic superconductors. A substantial improvement of the mechanical properties has been achieved over those of the ceramic Y1Ba2Cu3O7–δ material.

NORMAL STATE RESISTIVITY OF A QUANTUM ANTIFERROMAGNET IN HIGH Tc CUPREOUS OXIDES

1990 ◽  
Vol 04 (09) ◽  
pp. 591-603
Author(s):  
J. H. XU ◽  
C. S. TING ◽  
D. Y. XING
Keyword(s):  
Spin Wave ◽  
Normal State ◽  
Room Temperature ◽  
Valence Bond ◽  
Normal State Resistivity ◽  
High Tc ◽  
Out Of Plane ◽  
Quantum Antiferromagnet

The normal state in-plane resistivity ρab and the out-of-plane resistivity ρc of high T c cupreous oxides are studied in terms of the interactions between the charged carries and the excitations including phonons in a doped quantum antiferromagnet which can be described by either a resonant valence bond (RVB) state or a quantum Néel state. We found that only in a properly doped quantum Néel state and when the renormalized the speed of spin wave becomes soft, ρab and σc = 1/ρc could have the desired experimental behaviors and depend linearly on T from T c up to room temperature if the quantum Néel state still, persists in high T c samples.

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