Ultra-Low-Field Squid Magnetic Measurements on High Temperature Ceramic YBaCuO Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
D. C. Cronemeyer ◽  
A. P. Malozemoff ◽  
T. R. Mcguire
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Ceramic Sample ◽  
Superconducting Transition Temperature ◽  
Magnetic Measurements ◽  
Zero Field ◽  
Superconducting Transition ◽  
Temperature Range ◽  
Low Field ◽  
The Difference

ABSTRACTWe report ultra-low-field (5 mOe - 1 Oe) magnetic measurements on a ceramic sample of YBaCuO. A positive remanent moment is observed which accurately equals the difference of the field-cooled and zero-field-cooled moments throughout the temperature range. At higher fields this relationship breaks down. A reversible region is observed near the superconducting transition temperature which is independent of field. These results are discussed in the context of recent models.

ELECTRICAL AND MAGNETIC MEASUREMENTS IN K DOPED GdBa2Cu3O7−d HIGH TEMPERATURE SUPERCONDUCTORS

1993 ◽  
Vol 07 (18) ◽  
pp. 3273-3279 ◽  
Author(s):  
V. VIDYALAL ◽  
K. RAJASREE ◽  
C.P.G. VALLABHAN ◽  
PREETHI CICILY THOMAS ◽  
V. UNNIKRISHNAN NAYAR
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Ceramic Material ◽  
Superconducting Transition Temperature ◽  
Sintering Temperature ◽  
Magnetic Measurements ◽  
High Temperature Superconductors ◽  
Superconducting Transition

Stable and reproducible superconducting transition between 92 K and 100 K has been observed both resistively and magnetically in potassium doped GdBa 2 Cu 3 O 7−δ ceramic material. It has been found that the sintering temperature as well as stoichiometry plays an important role in determining the value of T c . Subtle changes in T c occur for certain weight % of K. The effect of changing composition on the superconducting transition temperature is also reported here.

scholarly journals Enhancing Superconductivity of the Nonmagnetic Quasiskutterudites by Atomic Disorder

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5830
Author(s):  
Andrzej Ślebarski ◽  
Maciej M. Maśka
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductors ◽  
Superconducting Phase ◽  
Length Scale ◽  
Superconducting Transition ◽  
Atomic Disorder ◽  
Strong Inhomogeneity ◽  
Related Compounds

We investigated the effect of enhancement of superconducting transition temperature Tc by nonmagnetic atom disorder in the series of filled skutterudite-related compounds (La3M4Sn13, Ca3Rh4Sn13, Y5Rh6Sn18, Lu5Rh6Sn18; M= Co, Ru, Rh), where the atomic disorder is generated by various defects or doping. We have shown that the disorder on the coherence length scale ξ in these nonmagnetic quasiskutterudite superconductors additionally generates a non-homogeneous, high-temperature superconducting phase with Tc⋆>Tc (dilute disorder scenario), while the strong fluctuations of stoichiometry due to increasing doping can rapidly increase the superconducting transition temperature of the sample even to the value of Tc⋆∼2Tc (dense disorder leading to strong inhomogeneity). This phenomenon seems to be characteristic of high-temperature superconductors and superconducting heavy fermions, and recently have received renewed attention. We experimentally documented the stronger lattice stiffening of the inhomogeneous superconducting phase Tc⋆ in respect to the bulk Tc one and proposed a model that explains the Tc⋆>Tc behavior in the series of nonmagnetic skutterudite-related compounds.

Superconductivity of embedded lead nano particles in metallic and amorphous matrices

2001 ◽  
Vol 703 ◽  
Author(s):  
K. Chattopadhyay ◽  
V. Bhattacharya ◽  
A. P. Tsai
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Magnetic Measurements ◽  
Microstructural Characterization ◽  
Rapid Solidification Processing ◽  
Nano Particles ◽  
Superconducting Transition ◽  
Solidification Processing ◽  
Embedded Particles

ABSTRACTNanodispersed lead in metallic and amorphous matrices was synthesized by rapid solidification processing. The optimum microstructure was tailored to avoid percolation of the particles. With these embedded particles it is possible to study quantitatively the effect of size on the superconducting transition temperature by carrying out quantitative microstructural characterization and magnetic measurements. Our results suggest the role of the matrices in enhancement or depression of superconducting transition temperature of lead. The origin of this difference in behavior with respect to different matrices and sizes is discussed.

Volume dependence of the superconducting transition temperature for the high-temperature superconductorHgBa2Ca2−xPbxCu3O8+δ

1994 ◽  
Vol 50 (18) ◽  
pp. 13778-13785 ◽  
Author(s):  
Charles C. Kim ◽  
A. R. Drews ◽  
E. F. Skelton ◽  
S. B. Qadri ◽  
M. S. Osofsky ◽  
...  
Keyword(s):  
High Temperature ◽  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Superconducting Transition ◽  
Volume Dependence

Low-Field microwave measurements of YBa2Cu3O7?x near the superconducting transition temperature

1988 ◽  
Vol 1 (1) ◽  
pp. 81-87 ◽  
Author(s):  
R. Karim ◽  
S. A. Oliver ◽  
C. Victoria ◽  
G. Balestrino ◽  
S. Barbanera ◽  
...  
Keyword(s):  
Transition Temperature ◽  
Superconducting Transition Temperature ◽  
Microwave Measurements ◽  
Superconducting Transition ◽  
Low Field

ELASTIC PROPERTIES OF La-BASED AND Y-BASED OXIDE SUPERCONDUCTIVE MATERIALS

1994 ◽  
Vol 08 (03) ◽  
pp. 275-307 ◽  
Author(s):  
WU TING ◽  
K. FOSSHEIM
Keyword(s):  
Phase Transitions ◽  
Transition Temperature ◽  
Elastic Properties ◽  
Superconducting Transition Temperature ◽  
Elastic Behavior ◽  
Superconducting Transition ◽  
Temperature Range ◽  
Elastic Anomalies ◽  
Structural Instabilities

Elastic measurements on La-based and Y-based bulk oxide superconductive materials in the temperature range 4.2–350 K are reviewed. Emphasis is placed on the elastic behavior near the superconducting transition temperature Tc and at higher temperatures where phase transitions or structural instabilities may occur. Possible mechanisms responsible for the observed elastic anomalies are discussed.

High-temperature superconductivity in transition metallic hydrides MH11 (M = Mo, W, Nb, and Ta) under high pressure

2021 ◽  
Vol 23 (11) ◽  
pp. 6717-6724
Author(s):  
Mingyang Du ◽  
Zihan Zhang ◽  
Hao Song ◽  
Hongyu Yu ◽  
Tian Cui ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Transition Temperature ◽  
Critical Temperature ◽  
Superconducting Transition Temperature ◽  
High Temperature Superconductivity ◽  
Superconducting Transition ◽  
Optical Phonons ◽  
Acoustic Phonons ◽  
Acoustic Modes

The contribution of optical and acoustic modes to the superconducting transition temperature. The calculated EPC parameter λ, critical temperature (Tc), critical temperature caused by the interaction of electrons with optical phonons (T0c) and acoustic phonons (Tacc).

Radiation Damage in YBa2Cu3O7 by Fast Neutrons

1987 ◽  
Vol 99 ◽  
Author(s):  
J. O. Willis ◽  
J. R. Cost ◽  
R. D. Brown ◽  
J. D. Thompson ◽  
D. E. Peterson
Keyword(s):  
Transition Temperature ◽  
Critical Current Density ◽  
Fast Neutron ◽  
Critical Current ◽  
Current Density ◽  
Superconducting Transition Temperature ◽  
Fast Neutrons ◽  
Zero Field ◽  
Superconducting Transition ◽  
Fast Neutron Irradiation

ABSTRACTThe superconducting transition temperature of sintered YBa2Cu3O7 decreases at a rate of 2.7 K/1018 n/cm2 (E > 0.1 MeV) for fast neutron irradiation. The critical current density Jc increases a factor of three at zero field and more than three at nonzero fields for fluences up to 2×1018 n/cm2. At both 7 and 75 K, Jc is decreasing with fluence near 3×1018 n/cm2.

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