Signatures of pressure induced superconductivity in insulating Bi2212

Details Signatures of pressure induced superconductivity in insulating Bi2212 Signatures of pressure induced superconductivity in insulating Bi2212

2010-02-25

arxiv.org/abs/1002.4672v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

We have performed several high pressure electrical resistance experiments on Bi1.98Sr2.06Y0.68Cu2O8, an insulating parent compound of the high-Tc Bi2212 family of copper oxide superconductors. We find a resistive anomaly, a downturn at low temperature, that onsets with applied pressure in the 20-40 kbar range. Through both resistance and magnetoresistance measurements, we identify this anomaly as a signature of induced superconductivity. Resistance to higher pressures decreases Tc, giving a maximum of 10 K. The higher pressure measurements exhibit a strong sensitivity to the hydrostaticity of the pressure environment. We make comparisons to the pressure induced superconductivity now ubiquitous in the iron arsenides.

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