Cryogenic scanning tunneling spectroscopy studies of inhomogeneous superconductors |
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Authors: | Oded Millo Yair Levi Eyal Bar-Sadeh Uri Asaf Israel Felner |
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Affiliation: | (1) Racah Institute of Physics, The Hebrew University, 91904 Jerusalem, Israel |
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Abstract: | We applied scanning tunneling microscopy and spectroscopy, combined with magnetic susceptibility measurements and Mossbauer
spectroscopy, in studies of three superconducting materials. Two belong to a new class of high Tc magnetic-superconductor systems, R1.4Ce0.6RuSr2Cu2O10-δ (R=Eu and Gd), which are magnetically ordered at TN≪Tc. The third is a granular normal-superconductor system, where the superconducting phase is YNi2B2C. In this paper we focus on the tunneling measurements, which exhibit large spatial variations of the local electronic properties
for all three materials. Albeit, these local measurements also reveal pronounced differences between the third and the first
two systems, which will be discussed in view of their macroscopic properties. |
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