High pressure synthesis of Hg1223 superconductor under highly oxidizing atmosphere

N. Yoshida; S. Adachi; T. Tatsuki; T. Tamura; K. Tanabe; S. Fujihara; T. Kimura

doi:10.1016/S0955-2219(98)00479-8

High pressure synthesis of Hg1223 superconductor under highly oxidizing atmosphere

N. Yoshida, S. Adachi, T. Tatsuki, T. Tamura, K. Tanabe, S. Fujihara, T. Kimura

Department of Applied Chemistry

Research output: Contribution to journal › Article

2 Citations (Scopus)

Abstract

We tried to prepare the mercury-based superconductor, HgBa₂Ca₂Cu₃O_8+δ (Hg1223), under highly oxidizing atmosphere using a high pressure technique. Samples containing Hg1223 as the main phase with T_C=90-122K were obtained. CuO and a new phase were included in the samples as impurities. The a-axes of the samples were shorter than the values ever reported for Hg1223 with T_C=135K. These results suggest that our Hg1223 samples had excess hole concentrations, i.e. they are over-doped. The irreversibility field (B_irr) was measured for two samples with T_C=118 and 94K. They had almost the same normalized temperature (1-T/T_C) dependence of B_irr.

Original language	English
Pages (from-to)	1543-1546
Number of pages	4
Journal	Journal of the European Ceramic Society
Volume	19
Issue number	6-7
DOIs	https://doi.org/10.1016/S0955-2219(98)00479-8
Publication status	Published - 1999 Jun

Keywords

High pressure synthesis
Magnetic properties
Oxide superconductors.
Superconductivity

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1016/S0955-2219(98)00479-8

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title = "High pressure synthesis of Hg1223 superconductor under highly oxidizing atmosphere",

abstract = "We tried to prepare the mercury-based superconductor, HgBa2Ca2Cu3O8+δ (Hg1223), under highly oxidizing atmosphere using a high pressure technique. Samples containing Hg1223 as the main phase with TC=90-122K were obtained. CuO and a new phase were included in the samples as impurities. The a-axes of the samples were shorter than the values ever reported for Hg1223 with TC=135K. These results suggest that our Hg1223 samples had excess hole concentrations, i.e. they are over-doped. The irreversibility field (Birr) was measured for two samples with TC=118 and 94K. They had almost the same normalized temperature (1-T/TC) dependence of Birr.",

keywords = "High pressure synthesis, Magnetic properties, Oxide superconductors., Superconductivity",

author = "N. Yoshida and S. Adachi and T. Tatsuki and T. Tamura and K. Tanabe and S. Fujihara and T. Kimura",

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T1 - High pressure synthesis of Hg1223 superconductor under highly oxidizing atmosphere

AU - Yoshida, N.

AU - Adachi, S.

AU - Tatsuki, T.

AU - Tamura, T.

AU - Tanabe, K.

AU - Fujihara, S.

AU - Kimura, T.

PY - 1999/6

Y1 - 1999/6

N2 - We tried to prepare the mercury-based superconductor, HgBa2Ca2Cu3O8+δ (Hg1223), under highly oxidizing atmosphere using a high pressure technique. Samples containing Hg1223 as the main phase with TC=90-122K were obtained. CuO and a new phase were included in the samples as impurities. The a-axes of the samples were shorter than the values ever reported for Hg1223 with TC=135K. These results suggest that our Hg1223 samples had excess hole concentrations, i.e. they are over-doped. The irreversibility field (Birr) was measured for two samples with TC=118 and 94K. They had almost the same normalized temperature (1-T/TC) dependence of Birr.

AB - We tried to prepare the mercury-based superconductor, HgBa2Ca2Cu3O8+δ (Hg1223), under highly oxidizing atmosphere using a high pressure technique. Samples containing Hg1223 as the main phase with TC=90-122K were obtained. CuO and a new phase were included in the samples as impurities. The a-axes of the samples were shorter than the values ever reported for Hg1223 with TC=135K. These results suggest that our Hg1223 samples had excess hole concentrations, i.e. they are over-doped. The irreversibility field (Birr) was measured for two samples with TC=118 and 94K. They had almost the same normalized temperature (1-T/TC) dependence of Birr.

KW - High pressure synthesis

KW - Magnetic properties

KW - Oxide superconductors.

KW - Superconductivity

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