Improvement in superconductivity of TlBa2CaCu2Oy system by introduction of oxygen loss

S. Nakajima; M. Kikuchi; Y. Syono; K. Nagase; T. Oku; N. Kobayashi; D. Shindo; K. Hiraga

doi:10.1016/0921-4534(90)90014-6

Improvement in superconductivity of TlBa₂CaCu₂O_y system by introduction of oxygen loss

S. Nakajima, M. Kikuchi, Y. Syono, K. Nagase, T. Oku, N. Kobayashi, D. Shindo, K. Hiraga

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The T_c and oxygen content of TlBa₂CaCu₂O_y have been investigated by quenching experiments, in which the heat-treated samples were dropped into liquid nitrogen. The oxygen loss, v, of TlBa₂CaCu₂O_{y_o - v} was determined by thermogravimetry in a nitrogen atmosphere using an oxygen-annealed specimen of TlBa₂CaCu₂O_{y_o} and also by measurements of the weight differences before and after quenching. T_c increased from 80 K of the oxygen-annealed specimen up to about 110 K with increasing oxygen loss up to v = 0.035 by annealing at 500°C in a nitrogen atmosphere. Judging from the high T_c above 110 K achieved by a small oxygen loss about v = 0.035, the as-sintered oxygen-annealed TlBa₂CaCu₂O_{y_o} specimen was in the over-doping state and probably has an oxygen vacancy of 7 - y_o0.

Original language	English
Pages (from-to)	443-447
Number of pages	5
Journal	Physica C: Superconductivity and its applications
Volume	170
Issue number	5-6
DOIs	https://doi.org/10.1016/0921-4534(90)90014-6
Publication status	Published - 1990 Oct 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Improvement in superconductivity of TlBa2CaCu2Oy system by introduction of oxygen loss",

abstract = "The Tc and oxygen content of TlBa2CaCu2Oy have been investigated by quenching experiments, in which the heat-treated samples were dropped into liquid nitrogen. The oxygen loss, v, of TlBa2CaCu2Oyo - v was determined by thermogravimetry in a nitrogen atmosphere using an oxygen-annealed specimen of TlBa2CaCu2Oyo and also by measurements of the weight differences before and after quenching. Tc increased from 80 K of the oxygen-annealed specimen up to about 110 K with increasing oxygen loss up to v = 0.035 by annealing at 500°C in a nitrogen atmosphere. Judging from the high Tc above 110 K achieved by a small oxygen loss about v = 0.035, the as-sintered oxygen-annealed TlBa2CaCu2Oyo specimen was in the over-doping state and probably has an oxygen vacancy of 7 - yo0.",

author = "S. Nakajima and M. Kikuchi and Y. Syono and K. Nagase and T. Oku and N. Kobayashi and D. Shindo and K. Hiraga",

year = "1990",

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doi = "10.1016/0921-4534(90)90014-6",

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T1 - Improvement in superconductivity of TlBa2CaCu2Oy system by introduction of oxygen loss

AU - Nakajima, S.

AU - Kikuchi, M.

AU - Syono, Y.

AU - Nagase, K.

AU - Oku, T.

AU - Kobayashi, N.

AU - Shindo, D.

AU - Hiraga, K.

PY - 1990/10/1

Y1 - 1990/10/1

N2 - The Tc and oxygen content of TlBa2CaCu2Oy have been investigated by quenching experiments, in which the heat-treated samples were dropped into liquid nitrogen. The oxygen loss, v, of TlBa2CaCu2Oyo - v was determined by thermogravimetry in a nitrogen atmosphere using an oxygen-annealed specimen of TlBa2CaCu2Oyo and also by measurements of the weight differences before and after quenching. Tc increased from 80 K of the oxygen-annealed specimen up to about 110 K with increasing oxygen loss up to v = 0.035 by annealing at 500°C in a nitrogen atmosphere. Judging from the high Tc above 110 K achieved by a small oxygen loss about v = 0.035, the as-sintered oxygen-annealed TlBa2CaCu2Oyo specimen was in the over-doping state and probably has an oxygen vacancy of 7 - yo0.

AB - The Tc and oxygen content of TlBa2CaCu2Oy have been investigated by quenching experiments, in which the heat-treated samples were dropped into liquid nitrogen. The oxygen loss, v, of TlBa2CaCu2Oyo - v was determined by thermogravimetry in a nitrogen atmosphere using an oxygen-annealed specimen of TlBa2CaCu2Oyo and also by measurements of the weight differences before and after quenching. Tc increased from 80 K of the oxygen-annealed specimen up to about 110 K with increasing oxygen loss up to v = 0.035 by annealing at 500°C in a nitrogen atmosphere. Judging from the high Tc above 110 K achieved by a small oxygen loss about v = 0.035, the as-sintered oxygen-annealed TlBa2CaCu2Oyo specimen was in the over-doping state and probably has an oxygen vacancy of 7 - yo0.

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ER -

Improvement in superconductivity of TlBa₂CaCu₂O_y system by introduction of oxygen loss

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