SUPERCONDUCTING PROPERTIES AND NORMAL-STATE RESISTIVITY OF CaBaLaCu3Oy

1990 ◽  
Vol 04 (13) ◽  
pp. 863-870 ◽  
Author(s):  
H.C. LEE ◽  
S.G. LEE ◽  
Y.C. KIM ◽  
K.S. YI ◽  
M.S. JANG
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Mean Free Path ◽  
Electron Interaction ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Normal State Resistivity ◽  
Linear Behavior ◽  
Electron Phonon Coupling ◽  
Electron Mean Free Path

The superconducting properties of CaBaLaCu 3 O y with Tc=76 K were reported. The X-ray diffraction pattern analysis shows that the CaBaLaCu3Oy compound has tetragonal structure at room temperature. The superconductivity of this compound was confirmed from the temperature dependence of electrical resistivity and self-inductance. We also examined the temperature dependence of the normal-state resistivity ρ(T) from 300 K to 900 K. From the linear behavior of ρ(T) in the range Tc<T<620 K, the strength of electron-phonon coupling constant λ and the electron mean free path l are obtained from the standard electron-phonon dissipation mechanism. Our estimated value of λ≃0.62 implies that the superconductivity of CaBaLaCu 3 O y is not to be interpreted only in terms of the phonon-mediated electron-electron interaction.

Transport Properties of Ru1Sr2Gd2-xCexCu2O10 Compounds

2013 ◽  
Vol 665 ◽  
pp. 347-352
Author(s):  
A. Roy ◽  
T.A. Jamadar ◽  
Ajay Kumar Ghosh
Keyword(s):  
Transport Properties ◽  
Normal State ◽  
Scanning Electron Micrographs ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
Normal State Resistivity ◽  
X Ray ◽  
Annealing Conditions ◽  
Flowing Oxygen ◽  
Scanning Electron

We have synthesized Ru1Sr2Gd2-xCexCu2O10 (Ru-1222) materials using several concentrations of Ce. All ruthenocuprate compounds have been characterised by using standard X-ray diffraction (XRD) and Scanning Electron Micrographs (SEM). The concentration of Ce affects transport properties drastically. Compounds with x=0.5 remain nonsuperconducting with moderate resistivity even after annealing in different conditions. Enormous change in the normal state resistivity has been observed in different annealing conditions of Ru-1222 with x=0.5. Superconducting properties have been observed in compounds with x=0.65. The highest critical temperature obtained is 27.5K for x=0.65. In addition, the duration of annealing in flowing oxygen is found to be effective in changing the normal state resistivity for x=0.65.

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

PHONON ANOMALY IN RAMAN ACTIVE PHONONS OF CUPRATES IN NORMAL STATE

1999 ◽  
Vol 13 (03) ◽  
pp. 293-313 ◽  
Author(s):  
B. N. PANDA ◽  
G. C. ROUT
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Microscopic Theory ◽  
Temperature Limit ◽  
Model Parameters ◽  
Effective Electron ◽  
Electron Phonon Coupling ◽  
Raman Modes ◽  
Phonon Anomaly ◽  
Raman Active Phonon

We present here a microscopic theory to explain phonon anomaly in Raman active phonons of the cuprates R 2-x M x CuO 4 in normal state. We used electronic Hamiltonion of Fulde in presence of antiferromagnetism. We incorporated phonon interaction to the hybridisation between the conduction electrons of the system and the f-electrons. The spectral density is calculated by the Green fuction technique of Zubarev type at zero wave vector and low temperature limit. Temperature dependence of Raman active phonon frequencies are studied numerically to discern phonon anomalies by varying model parameters like position of f-level (∊f), the effective electron–phonon coupling strength (g), the staggered magnetic field (h) and the hybridisation parameter (V). The phonon anomalies are explained on the basis of softening, hardening and temperature dependence of different Raman modes.

STUDY OF SUBSTITUTION OF Zn FOR Cu IN YBa2Cu3O7 SYSTEM

2013 ◽  
Vol 22 ◽  
pp. 583-588
Author(s):  
P. K. SHARMA ◽  
A. SAMARIYA ◽  
M. S. DHAWAN ◽  
R. K. SINGHAL
Keyword(s):  
Magnetic Moment ◽  
Normal State ◽  
Photoelectron Spectroscopy ◽  
Local Magnetic Moment ◽  
Pair Breaking ◽  
X Ray Diffraction ◽  
Normal State Resistivity ◽  
X Ray ◽  
Zn Substitution ◽  
Magnetic Pair

The polycrystalline YBa2(Cu1-XZnX)3O7-δ samples (x=0.0 to 0.06) were synthesized and studied using X Ray diffraction, titration, resistivity, magnetization and X ray photoelectron spectroscopy (XPS). Results show that O2 stoichiometry (δ) changes on Zn substitution which affects their normal state resistivity as well as the TC. Zn also induces local magnetic moment as evidenced from magnetization results. A combination of change in O2 stoichiometry and magnetic pair breaking is found to be responsible for a rapid suppression of superconductivity.

EFFECT OF SUBSTITUTION OF Na, Cd, Bi for Ca in Bi-Sr-Ca-Cu OXIDE SUPERCONDUCTORS

1989 ◽  
Vol 03 (12) ◽  
pp. 939-944 ◽  
Author(s):  
YU MEI ◽  
S.M. GREEN ◽  
C. JIANG ◽  
H.L. LUO ◽  
C. POLITIS
Keyword(s):  
Solid State ◽  
Normal State ◽  
Solid State Reaction ◽  
Oxide Superconductors ◽  
X Ray Diffraction ◽  
Normal State Resistivity ◽  
X Ray

Samples with compositions Bi 1.8 Pb 0.2 Sr 2( Ca 2−x Na x) Cu 3 O y, BiSr(Ca 1−x Cd x) Cu 2 O y and BiSr ( Ca 1−x Bi x) Cu 2 O y were prepared through solid state reaction. The X-ray diffraction results were analyzed and their resistivity behavior was studied. In general, all such substitution adversely affected their superconductive properties. All samples are of multiphase. The normal state resistivity behaves quite differently with the substitution of electropositive Na as compared with the replacement of electronegative Bi.

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.

scholarly journals Anisotropic temperature dependence of normal state resistivity in underdoped region of a layered electron-doped superconductor Nd2–xCexCuO4

2019 ◽  
Vol 45 (2) ◽  
pp. 217-223 ◽  
Author(s):  
A. S. Klepikova ◽  
T. B. Charikova ◽  
N. G. Shelushinina ◽  
M. R. Popov ◽  
A. A. Ivanov
Keyword(s):  
Temperature Dependence ◽  
Normal State ◽  
Normal State Resistivity ◽  
Anisotropic Temperature ◽  
Underdoped Region
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