Switching phenomena in a new 90-K superconductor

P. H. Hor, R. L. Meng, C. W. Chu, M. K. Wu, E. Zirngiebl, J. D. Thompson, C. Y. Huang

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

Recently, Wu et al.1 and Hor et al.2 have shown that Y1.2Ba0.8CuO4-δ is a superconductor with a superconducting onset temperature at ∼92 K as determined by their resistivity and a.c. susceptibility measurements. Because the magnetic properties are important in describing the nature of superconductivity, we have measured the d.c. magnetic moment of this material. Here we show that this material cooled in zero field or in a high field (Hcool > 90 G) is diamagnetic below Tcm ≈90 K, consistent with the previous measurements1,2. However, when the sample is cooled in a small field (≤85 G), the magnetization, M, first becomes negative (diamagnetic) below Tcm, but further cooling results in a jump of M to a positive value at low temperature. We have also observed this switching by the application of an additional small field when the sample was cooled in a small field.

原文English
頁(從 - 到)669-670
頁數2
期刊Nature
326
發行號6114
DOIs
出版狀態Published - 1987

All Science Journal Classification (ASJC) codes

  • 多學科

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