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Structural effects of hydrostatic pressure in Sr1-xMxCuO2 (M=La,Ca) and Sr4Cu6O10.

Phys Rev B Condens Matter 50:17 (1994) 12752-12759

Authors:

H Shaked, Y Shimakawa, BA Hunter, PG Radaelli, B Dabrowski, RL Hitterman, JD Jorgensen, PD Han, DA Payne, S Kikkawa, G Er, F Kanamaru
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Tunnel spectroscopy into the YBa2Cu4O8 compound

Il Nuovo Cimento D 16:10-11 (1994) 1885-1888

Authors:

P Romano, R Di Leo, A Nigro, AM Cucolo, B Dabrowski, PG Radaelli

Abstract:

We have realized planar tunnel junctions using both Y123 and Y124 single crystals as base electrodes and Pb as counterelectrode. The crystals, with T c =90 K (Y123) and T c =80 K (Y124), have been chemically etched and natural barriers were formed by a short air exposure. We have compared the tunneling spectra obtained on both systems. The features at about±18mV of the Y123 compound are still observed in the Y124, while the low-bias structures at ±5 mV are not present in the tunneling characteristics of the Y124 system. Linearity of the background conductance is also observed, with less steep slopes in Y124 that might indicate a reduced interlayer coupling in this system. © 1994 Societá Italiana di Fisica.
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Tunneling spectroscopy into YBa2Cu4O8: Intralayer and interlayer analysis.

Phys Rev B Condens Matter 50:14 (1994) 10397-10400

Authors:

AM Cucolo, RD Leo, P Romano, B Dabrowski, DG Hinks, PG Radaelli
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Structural effects of hydrostatic pressure in orthorhombic La2-xSrxCuO4.

Phys Rev B Condens Matter 50:5 (1994) 3221-3229

Authors:

H Takahashi, H Shaked, BA Hunter, PG Radaelli, RL Hitterman, DG Hinks, JD Jorgensen
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Synthesis and properties of a cuprate superconductor containing double mercury-oxygen layers.

Science 265:5170 (1994) 380-383

Authors:

PG Radaelli, M Perroux, M Marezio, S de Brion, JL Tholence, Q Huang, A Santoro

Abstract:

A cuprate superconductor containing double mercury layers was synthesized with a high-pressure, high-temperature technique. The compound, with chemical formula Hg(2)Ba(2)-Y1-xCaxCu(2)O(8-delta), contains a double HgO layer with structure similar to that of rock salt. The prototype compound Hg(2)Ba(2)YCu(2)O(8-delta) is an insulator. Superconductivity is induced in the system by partially replacing yttrium with calcium.
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