Random telegraph voltages in high-Tc thin films at zero magnetic field

1996 ◽  
Vol 46 (S3) ◽  
pp. 1363-1364
Author(s):  
Vilyam Askhenzy ◽  
Corrado Coccorese ◽  
Grzegorz Jung ◽  
Bonaventura Savo ◽  
Boris Ya. Shapiro
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Zero Magnetic Field ◽  
High Tc

HIGH MAGNETIC FIELD HALL EFFECT AND MAGNETORESISTANCE STUDIES OF Y-Ba-Cu-O: A HIGH Tc SUPERCONDUCTOR

1987 ◽  
Vol 01 (02) ◽  
pp. 413-417
Author(s):  
J.D. Hettinger ◽  
A.G. Swanson ◽  
J.S. Brooks ◽  
Y.P. Ma
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Transition Temperature ◽  
Hall Effect ◽  
High Temperature Superconductor ◽  
Strong Dependence ◽  
Zero Magnetic Field ◽  
High Tc ◽  
Relative Percentage ◽  
High Tc Superconductor

We have measured the transition temperature, critical field, magnetoresistance, and Hall effect for the high temperature superconductor Y-Ba-Cu-O in magnetic fields up to 23T in the temperature range 4.2 to 125K. Meissner studies at zero magnetic field were also performed in some cases. We find a strong dependence of these parameters on the relative percentage of the correct phase of Y-Ba-Cu-O in the sample. We report new results on magnetoresistance and Hall effect in these materials.

Scaling of Resistivities in MgB2

2006 ◽  
Vol 47 ◽  
pp. 113-117
Author(s):  
Petr Vašek
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Critical Temperature ◽  
External Magnetic Field ◽  
Transport Current ◽  
Zero Magnetic Field ◽  
Superconducting Transition ◽  
Hall Voltage ◽  
Transition Range ◽  
Width Of Superconducting Transition

Longitudinal and transverse voltages have been measured on thin films of MgB2 with different width of superconducting transition range. The study has been performed in zero and nonzero external magnetic fields. The non-zero transverse voltage has been observed in close vicinity of the critical temperature in zero external magnetic field while far enough from Tc this voltage has been zero. In magnetic field it merges into transverse voltage which is an even function with respect to the direction of the field. Usual Hall voltage starts to appear with increasing magnetic field. At the highest field the even voltage disappears and only the Hall voltage is measurable i.e. the transverse even voltage is suppressed with increasing magnetic field and increasing transport current as well. New scaling between transverse and longitudinal resistivities has been observed in the form ρxy~dρxx/dT . This correlation is valid not only in the zero magnetic field but also in nonzero magnetic field where transverse even voltage can be detected. Several models trying to explain observed results are discussed. The most promising seems to be guided motion of the vortices.

scholarly journals Magnetic field dependence of Josephson photoresponse in high-Tc superconductor thin films

1994 ◽  
Vol 89 (8) ◽  
pp. 705-708 ◽  
Author(s):  
Gi. Schneider ◽  
P.G. Huggard ◽  
T.P. O'Brien ◽  
W. Blau ◽  
W. Prettl
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
High Tc ◽  
High Tc Superconductor ◽  
Superconductor Thin Films

Preparation of Fibrous Bi(Pb)-Sr-Ca-Cu-O Crystals Containing the High-Tc Phase

1989 ◽  
Vol 169 ◽  
Author(s):  
I. Matsubara ◽  
H. Tanigawa ◽  
T. Ogura ◽  
H. Yamashita ◽  
M. Kinoshita ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Volume Fraction ◽  
Zero Magnetic Field ◽  
High Tc ◽  
X Ray ◽  
High Tc Phase ◽  
Zero Resistance ◽  
Resistance State ◽  
Oxygen Gas ◽  
T Phase

AbstractFibrous crystals containing the high-Tc phase (2223 phase) of the Bi(Pb)-Sr-Ca-Cu-O superconductor have been prepared by heating a glassy melt-quenched plate in a stream of oxygen gas. Each fiber is composed of several platelike single crystals which are stacked in a layered structure. The fibers show two stepdrops in resistance at 105K and 73K, and a zero-resistance state around 70K. From the results of SQUID measurements, the volume fraction of the high-T phase is found to be about 0.6%. The high-Tc phase is also detected with a microarea X-ray diffractometer, and it is stacked in the interlayer between the low-Tc platelike crystals. For the fibrous Bi-Sr-Ca-Cu-Li-O crystals, the volume fraction of the high-Tc phase increases to 1.5% and a zero resistance state is achieved at 81K. The Jc value of the Li doped fiber is 30,000A/cm2 at 77K and 300,000A/cm2 at 66K in a zero magnetic field.

scholarly journals New Measurements of the Transition to the Normal State Induced by High Current Densities in High-Tc Superconductor Microbridges under Thermal Smallness Conditions

2014 ◽  
Vol 95 ◽  
pp. 202-206 ◽  
Author(s):  
J.M. Doval ◽  
J. Maza ◽  
C. Torron ◽  
J.A. Veira ◽  
M. Tello ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Diffusion Length ◽  
High Current ◽  
Flux Flow ◽  
High Tc ◽  
High Tc Superconductor ◽  
Dimensional Scaling ◽  
Current Densities ◽  
Millisecond Range

We address here the superconductivity quenching under an external magnetic field of amplitudes up to 1 T and in the so-called "thermal smallness" condition, when the microbridge width becomes smaller than the thermal diffusion length of both the own superconductor and its refrigerant (the substrate, in the case of thin films), which breaks their thermal dimensional scaling. Our results further support that when the current perturbations have characteristic times in the millisecond range the quenching is due to thermal instabilities associated with regular (nonsingular) flux-flow, and they also suggest how to optimize the refrigeration of practical superconductors.

The critical magnetic field in the high-Tc superconductive thin films

1997 ◽  
Vol 282-287 ◽  
pp. 1945-1946 ◽  
Author(s):  
Y.-H. Zhang ◽  
L. Fu ◽  
X.-G. Li ◽  
J.-S. Zhu
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Critical Magnetic Field ◽  
High Tc

Enhancing Superconducting Parameters by Array of External Magnetic Dots

2009 ◽  
Vol 1180 ◽  
Author(s):  
Wei Jiang Yeh ◽  
Bo Cheng
Keyword(s):  
Magnetic Field ◽  
Thin Film ◽  
Thin Films ◽  
Pinning Force ◽  
High Tc Superconductors ◽  
High Tc ◽  
Current Value ◽  
Magnetic Dots ◽  
The Magnetic Field ◽  
Superconducting Parameters

AbstractEnhancing the pinning force in high-Tc superconductors can be achieved by externally introduced periodic magnetic dots. We use a novel nano-technique to deposit periodic sub-micon Ni dots on YBa2Cu3O7 thin films. The current versus voltage characteristics of an YBa2Cu3O7 thin film strip with uniform Ni dots are measured at various temperatures and magnetic fields. They are compared with the current versus voltage characteristics of a bare YBa2Cu3O7 thin film strip without magnetic dots. It is found the critical current value of the strip with Ni dots reduces with a much slower pace as the magnetic field strength increases in comparison with the value of the bare sample.

STUDY OF THE PREPARATION OF HIGH Tc SUPERCONDUCTING YBCO THIN FILMS BY A PLASMA-ASSISTED MOCVD PROCESS

1989 ◽  
Vol 50 (C5) ◽  
pp. C5-149-C5-153
Author(s):  
DING-KUN PENG ◽  
GUANG-YAO MENG ◽  
CHUN-BAO CAO ◽  
CHUN-LIN WANG ◽  
QI FANG ◽  
...  
Keyword(s):  
Thin Films ◽  
High Tc ◽  
Ybco Thin Films
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