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Observation of superconducting current in a mesa-heterostructure with an interlayer of the strontium iridate film with strong spin-orbit interaction | A.M. Petrzhik
; K.Y. Constantinian
; G.A. Ovsyannikov
; A.V. Shadrin
; A.S. Grishin
; Yu.V.Kislinski
; G. Christiani
; G. Logvenov
; | Date: |
6 Dec 2018 | Abstract: | The superconducting current has been observed in mesa-heterostructures
Nb/Au/Sr2IrO4/YBa2Cu3Ox with Sr2IrO4 interlayer thickness d=5 and 7 nm and
in-plane sizes L=10-50 mcm. A strontium iridate, Sr2IrO4, is known as a canted
antiferromagnetic insulator at low temperatures and characterized also by the
strong spin-orbit interaction due to the impact of the IrO2 plane. The
superconducting critical current density jC =0.3 A/cm^2 for the case d=7 nm was
observed at T=4.2K. The temperature dependences of the superconducting critical
current IC(T) and the voltage position on the I-V curve of the gap singularity
of the Nb electrode show an increase with decreasing temperature and
corresponds to the expected BCS behavior of the Nb energy gap. The critical
current is very sensitive to the influence of an external magnetic field and
reduces twice at an external magnetic field (H=0.2 Oe for L=40-50 mcm)
comparable with the earth magnetic field; The magnetic field dependence IC(H)
at low H was narrower than the Fraunhofer pattern about 1.5 times. Both the
integer and fractional Shapiro steps at voltages V=(m/n)(h/2e)fe were observed
under microwave radiation at frequencies fe=38 GHz and fe=50 GHz. Fractional
Shapiro steps (m/n=1/2, 3/2) may point on the presence of the second harmonic
in the superconducting current-phase relation. | Source: | arXiv, 1812.2583 | Services: | Forum | Review | PDF | Favorites |
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