Superconducting Nd1.85Ce0.15CuO4-y bicrystal grain boundary Josephson junctions

S. Kleefisch; L. Alff; U. Schoop; A. Marx; R. Gross; M. Naito; H. Sato

doi:10.1063/1.121449

Superconducting Nd_1.85Ce_0.15CuO_4-y bicrystal grain boundary Josephson junctions

S. Kleefisch, L. Alff, U. Schoop, A. Marx, R. Gross, M. Naito, H. Sato

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Abstract

We have studied the electric transport properties of symmetrical [001] tilt Nd_1.85Ce_0.15CuO_4-y (NCCO) bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO₃ bicrystal substrates with misorientation angles of 24° and 36.8°. The superconducting properties of the NCCO GBJs are similar to those of GBJs fabricated from the hole doped high temperature superconductors (HTS). The critical current density J_c decreases strongly with increasing misorientation angle. The products of the critical current I_c and the normal resistance R_n (∼100μV at 4.2K) are small compared to the gap voltage and fit well to the universal scaling law I_cR_n∝J_c found for GBJs fabricated from the hole doped HTS. This suggests that the symmetry of the order parameter, which most likely is different for the electron and the hole doped HTS, has little influence on the characteristic properties of symmetrical [001] tilt GBJs.

Original language	English
Pages (from-to)	2888-2890
Number of pages	3
Journal	Applied Physics Letters
Volume	72
Issue number	22
DOIs	https://doi.org/10.1063/1.121449
State	Published - 1998
Externally published	Yes

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title = "Superconducting Nd1.85Ce0.15CuO4-y bicrystal grain boundary Josephson junctions",

abstract = "We have studied the electric transport properties of symmetrical [001] tilt Nd1.85Ce0.15CuO4-y (NCCO) bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO3 bicrystal substrates with misorientation angles of 24° and 36.8°. The superconducting properties of the NCCO GBJs are similar to those of GBJs fabricated from the hole doped high temperature superconductors (HTS). The critical current density Jc decreases strongly with increasing misorientation angle. The products of the critical current Ic and the normal resistance Rn (∼100μV at 4.2K) are small compared to the gap voltage and fit well to the universal scaling law IcRn∝Jc found for GBJs fabricated from the hole doped HTS. This suggests that the symmetry of the order parameter, which most likely is different for the electron and the hole doped HTS, has little influence on the characteristic properties of symmetrical [001] tilt GBJs.",

author = "S. Kleefisch and L. Alff and U. Schoop and A. Marx and R. Gross and M. Naito and H. Sato",

year = "1998",

doi = "10.1063/1.121449",

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T1 - Superconducting Nd1.85Ce0.15CuO4-y bicrystal grain boundary Josephson junctions

AU - Kleefisch, S.

AU - Alff, L.

AU - Schoop, U.

AU - Marx, A.

AU - Gross, R.

AU - Naito, M.

AU - Sato, H.

PY - 1998

Y1 - 1998

N2 - We have studied the electric transport properties of symmetrical [001] tilt Nd1.85Ce0.15CuO4-y (NCCO) bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO3 bicrystal substrates with misorientation angles of 24° and 36.8°. The superconducting properties of the NCCO GBJs are similar to those of GBJs fabricated from the hole doped high temperature superconductors (HTS). The critical current density Jc decreases strongly with increasing misorientation angle. The products of the critical current Ic and the normal resistance Rn (∼100μV at 4.2K) are small compared to the gap voltage and fit well to the universal scaling law IcRn∝Jc found for GBJs fabricated from the hole doped HTS. This suggests that the symmetry of the order parameter, which most likely is different for the electron and the hole doped HTS, has little influence on the characteristic properties of symmetrical [001] tilt GBJs.

AB - We have studied the electric transport properties of symmetrical [001] tilt Nd1.85Ce0.15CuO4-y (NCCO) bicrystal grain boundary Josephson junctions (GBJs) fabricated on SrTiO3 bicrystal substrates with misorientation angles of 24° and 36.8°. The superconducting properties of the NCCO GBJs are similar to those of GBJs fabricated from the hole doped high temperature superconductors (HTS). The critical current density Jc decreases strongly with increasing misorientation angle. The products of the critical current Ic and the normal resistance Rn (∼100μV at 4.2K) are small compared to the gap voltage and fit well to the universal scaling law IcRn∝Jc found for GBJs fabricated from the hole doped HTS. This suggests that the symmetry of the order parameter, which most likely is different for the electron and the hole doped HTS, has little influence on the characteristic properties of symmetrical [001] tilt GBJs.

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Superconducting Nd_1.85Ce_0.15CuO_4-y bicrystal grain boundary Josephson junctions

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