Exoemission Testing of Violations of the Stoichiometry in High-Temperature Superconducting Ceramics on the Basis of YBa2Cu3O7–

Syurdo, A. I.; Kortov, V. S.; Milman, I. I.; Слесарев, А. И.

doi:10.1023/b:runt.0000036426.76177.96

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“…EXPERIMENTAL Ceramic YBa 2 Cu 3 O 6.8 specimens with a temperature of the superconducting transition of T c = 93 K, synthesized at the Institute of Chemistry, Ural Branch, Russian Academy of Sciences [5] were studied. They did not differ from the specimens that we studied in [1].…”

Section: Introductionmentioning

confidence: 71%

“…δ was increased to ~0.3 for the second specimen by heating it in vacuum at T ~ 700 K according to [1,7]. We conventionally refer to YBa 2 Cu 3 O 6.8 as a superconducting specimen and YBa 2 Cu 3 O 6.7 as a nonsuperconducting specimene at nitrogen temperatures.…”

Section: Magnetic and Electromagnetic Methodsmentioning

confidence: 99%

“…The possibility of using the exoemission technique to test deviations from stoichiometry in HTSC ceramics based on YBa 2 Cu 3 O 7-δ was reported in our previous work [1]. At the same time, it was shown [2] that, in some cases, when measuring thermally stimulated exoemission (TSE), additional photo-stimulation helps to find new relationships and to enhance the sensitivity of inspecting the surface layers of the materials subjected to treatment.…”

Section: Introductionmentioning

confidence: 95%

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A photo-thermally stimulated exoemission technique used to study the properties of HTSC ceramics based on YBa2Cu3O7−δ

Syurdo¹,

Kortov²,

Milman³

et al. 2004

Russ J Nondestruct Test

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The method of photo-thermally stimulated exoelectron emission (PTSE) is used to study the processes in the surface layers of HTSC ceramics based on YBa 2 Cu 3 O 7-δ . A correlation is observed between variations of the exoemission current and the transition to the superconducting state. The experimentally detected hysteresis in the PTSE intensity of YBa 2 Cu 3 O 7-δ ceramics, when thermally cycled in the range T = 80-160 K, is limited by two processes. Below T = 90 K, the chemisorption has a significant effect on the physical phenomena under study, thus impeding the search for new PTSE regularities in HTSC ceramics. At the same time, exoemission properties of the ceramics considerably change in the range 80-160 K. It is also shown that the superconducting transition and the thermal absorption phenomena for an YBa 2 Cu 3 O 6.8 specimen are split in the studied temperature range, which allows the PTSE technique to detect the superconducting state and to observe the transition dynamics.

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Section: Introductionmentioning

confidence: 71%

Section: Magnetic and Electromagnetic Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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