๐”– Bobbio Scriptorium
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Instrumentation for highly sensitive measurement of magnetocaloric effect: application to high Tc superconductors

โœ Scribed by H. Kato; K. Nara; M. Okaji

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
484 KB
Volume
31
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

Instrumentation for precise calorimetry under magnetic fields of up to 7 T in the temperature range 40-120 K is reported. A new type of resistance bridge with a selfcompensating function for the magnetoresistance of platinum resistance thermometers has been developed for this purpose. This thermometric system suppresses the measuring error due to a magnetic field of 7 T to within 40 mK and has a resolution of 1 mK. It is also applied to observing the small magnetocaloric effect of a high Tc superconductor, YBa2Cu307_ x, in adiabatic conditions.

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โœ F Bolzoni ๐Ÿ“‚ Article ๐Ÿ“… 1989 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 379 KB

Hc2 measurement in high pulsed fields, of type II superconductors is described. A special pick-up is used to measure the induced dM/dt while, simultaneously, an operational amplifier gives the derivative of the differential susceptibility (DDS). The double peak signal obtained decreases with increas