Superconducting current and low-energy states in a mesa-heterostructure interlayered with a strontium iridate film with strong spin-orbit interaction
A. M. Petrzhik, K. Y. Constantinian, G. A. Ovsyannikov, A. V. Zaitsev, A. V. Shadrin, A. S. Grishin, Yu. V. Kislinski, G. Cristiani, G. Logvenov
DOI 10.1103/PhysRevB.100.024501 · Physical Review B
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Abstract
The superconducting current has been observed in mesa-heterostructures Nb/Sr2IrO4/YBa2Cu3Ox with a Sr2IrO4 interlayer having strong spin-orbit interaction. The superconducting critical current density jC≈0.3A/cm2 for d=7 nm was registered at T=4.2K. Magnetic-field dependence of superconducting critical current IC(H) showed a sharp central peak and minor oscillating behavior for sidelobes indicated the absence of pinholes. Integer and fractional Shapiro steps were observed at voltages Vm,n=(m/n)(h/2e)fe under microwave radiation at frequencies fe=38 GHz and fe=50 GHz. Fractional Shapiro steps (m/n=1/2, 3/2) point on the presence of the second harmonic in the superconducting current-phase relation. The zero-bias conductance peak was observed hinting on existence of low-energy states at Sr2IrO4/YBa2Cu3Ox interface at temperatures higher than the superconducting critical temperature of Nb.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure not reported | onset |
| YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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