Superconductor based sensor for monitoring magnetic field
04 Oct 1992-pp 1683-1686
TL;DR: In this paper, a method for measurement of magnetic fields with the help of a HTSC (high temperature superconductor) based sensor in conjunction with a microcomputer is proposed.
Abstract: The authors propose a method for measurement of magnetic fields with the help of a HTSC (high temperature superconductor) based sensor in conjunction with a microcomputer. The same sensor may be used for monitoring current in a circuit under the influence of a controlled magnetic field acting perpendicular to the direction of the current flow. The theoretical basis is discussed. The system hardware, software, and operational principles are outlined. >
References
More filters
TL;DR: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure.
Abstract: A stable and reproducible superconductivity transition between 80 and 93 K has been unambiguously observed both resistively and magnetically in a new Y-Ba-Cu-O compound system at ambient pressure. An estimated upper critical field H c2(0) between 80 and 180 T was obtained.
5,965 citations
IBM1
TL;DR: Critical current densities in excess of 300 A/cm/sup 2/ have been measured close to T/sub c/ in the Y-based materials, which show a strong Meissner effect which agrees with the temperature dependence of the resistance.
Abstract: Studies of superconductivity in thin films of La-Sr-Cu-O and Y-Ba-Cu-O have resulted in samples completely superconducting at 87 K and with onsets as high as 97 K. The high-${T}_{c}$ materials show a strong Meissner effect which agrees with the temperature dependence of the resistance. Critical current densities in excess of 300 A/${\mathrm{cm}}^{2}$ have been measured close to ${T}_{c}$ in the Y-based materials.
274 citations
TL;DR: In this paper, a set of conditions for crystal growth of the high-temperature superconductor YBa2Cu3Ox are presented. But the conditions are not applicable to the case of high temperature superconductors, since the transition temperatures can be increased by thermal annealing.
Abstract: We report a set of conditions for crystal growth of the high‐temperature superconductor YBa2Cu3Ox. The as‐grown single crystals have critical temperatures up to 85 K. Preliminary studies have shown that the transition temperatures can be increased by thermal annealing in oxygen, as in ceramic samples. The crystals are in suitable dimensions for definitive magnetic, optical, and transport measurements.
160 citations
TL;DR: In this paper, the Ba2YCu3O7−δ type superconductors were fabricated using three different processes, i.e., melt drawing, melt spinning, or preform-wire melting.
Abstract: Fabrication of high Tc ceramic superconductors by an oxide melting method in place of a conventional sintering method has been attempted. Using three different processes, i.e., melt drawing, melt spinning, or preform‐wire melting, it is demonstrated that the Ba2YCu3O7−δ type superconductors can successfully be fabricated into a desired geometry such as wire and ribbon. Tc’s for R=0 were about 92 K. The density of the melt‐processed compound was measured to be as high as 6.2 g/cm3, or ∼98% of the theoretical density 6.3 g/cm3 as compared to the value of 80–85% density for sintered samples. The increased density is likely to be responsible for the noted improvements in fracture resistance and in the Jc value of the melt‐processed compound.
97 citations
TL;DR: In this article, a new technique for detection of superconductivity based on microwave resistivity is described, which is similar in both its implementation and execution to the technique of electron spin resonance, and exhibits high sensitivity.
Abstract: A new technique for detection of superconductivity which is based upon microwave resistivity is described. This method is similar in both its implementation and execution to the technique of electron‐spin resonance, and, as a consequence, exhibits high sensitivity. An additional benefit of this method is the fact that metal‐insulator phase transitions of materials are recorded only if they have a magnetic field dependence.
80 citations