한국초전도ㆍ저온공학회논문지 (Progress in Superconductivity and Cryogenics)

  • 제16권1호
  • /
  • Pages.6-8
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  • 2014
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  • 1229-3008(pISSN)
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  • 2287-6251(eISSN)
한국초전도저온학회 (The Korean Society of Superconductivity and Cryogenics)
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Superconducting transitions of LuBa2Cu3O7-z heated under various atmospheres

  • Lee, M.S. (Kangwon National University) ;
  • Lee, H.K. (Kangwon National University)
  • 투고 : 2013.12.16
  • 심사 : 2014.02.12
  • 발행 : 2014.03.31
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초록

The influence of quenching temperature, heating atmosphere and annealing time on superconducting characteristics has been studied for $LuBa_2Cu_3O_{7-z}$ compound which has been recently synthesized in a nearly phase-pure form. Resistivity measurements for the as-prepared sample heated at $300^{\circ}C$ in oxygen and subsequently quenched into liquid nitrogen revealed that there is no significant change in $T_c$. On the other hand, $T_c$ of the sample slightly increased when the sample was heated at $300^{\circ}C$ either in air or in $N_2$ atmosphere. It was also found that $T_c$ of the sample decreased when the annealing temperature in $N_2$ atmosphere increased above $400^{\circ}C$. The experimental results indicated that the as-prepared sample is under overdoped state. The enhanced superconducting transition observed in the samples after heating at $300^{\circ}C$ in air or $N_2$ atmosphere was discussed in conjunction with a slight removal of oxygen and ordering of oxygen atoms in the as-prepared sample.

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참고문헌

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