SUPERCONDUCTIVITY UP TO 90-K IN A NEW FAMILY OF THE (PB,HG)SR2(CA,Y)CU2O7 SYSTEM

Journal article

A new family of superconductors were observed in the (Pb0.5Hg0.5)Sr2(Ca1-xYx )Cu2O7-δ system for the composition range 0.5 ≤ x ≤ 0.2, with a maximum Tc of 90 K (at x = 0.3) as determined by electrical resistance and magnetization measurements. We have investigated the crystal structure across the entire composition range by X-ray diffraction, by which we identify the phase responsible for the superconductivity to be similar to that of (Pb,Cu)Sr2CaCu2O7 (the so-called Pb-based 1212 phase) with a space group of P4/mmm and lattice constants of a ranging from 3.8159(6) Å for x = 0.5 to 3.8082(4) Å for x = 0.2, and c ranging from 11.950(2) Å for x = 0.5 to 12.022(2) Å for x = 0.2. Moreover, the chemical composition of one sample in the series having nominal composition (Pb0.5Hg0.5)Sr2(Ca0.5Y0 .5)Cu2O7-δ(x = 0.5) was determined to be [Pb0.6Hg0.2Cu0.2]Sr2.0[Ca 0.42Y0.51Hg0.07] Cu2O7- δ by energy-dispersive spectrometry. © 1993 Academic Press. All rights reserved.

Authors: Hu, S; Jefferson, D; Liu, R; Edwards, P

• Publication status: Published
• Journal: JOURNAL OF SOLID STATE CHEMISTRY
• Volume: 103
• Issue: 1
• Pages: 280-286
• Publication date: 1993-03-01
• DOI: 10.1006/jssc.1993.1101
• EISSN: 1095-726X
• ISSN: 0022-4596
• Language: English