Superconducting properties of ultrathin Bi2Sr2CaCu2O8+x single crystals
L. X. You, A. Yurgens, and D. Winkler
TL;DR
This study investigates how reducing the thickness of Bi2212 single crystals affects their superconducting properties, revealing a transition from superconducting to insulating behavior as the crystals become ultrathin.
Contribution
It demonstrates the effects of ultrathin fabrication on Bi2212 crystals and identifies a superconductor-insulator transition at nanometer scales.
Findings
Superconducting transition temperature decreases with thickness
In-plane resistivity increases as crystals become ultrathin
Superconductor-insulator transition observed in nanometer-scale crystals
Abstract
We use Ar-ion milling to thin Bi2212 single crystals down to a few nanometers or one-to-two (CuO2)2 layers. With decreasing the thickness, superconducting transition temperature gradually decreases to zero and the in-plane resistivity increases to large values indicating the existence of a superconductor-insulator transition in ultrathin Bi2212 single crystals.
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