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Inverse proximity effect at superconductor-ferromagnet interfaces : Evidence for induced triplet pairing in the superconductor

Inverse proximity effect at superconductor-ferromagnet interfaces : Evidence for induced triplet pairing in the superconductor

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KALCHEIM, Yoav, Oded MILLO, Angelo DI BERNARDO, Avardeep PAL, Jason W. A. ROBINSON, 2015. Inverse proximity effect at superconductor-ferromagnet interfaces : Evidence for induced triplet pairing in the superconductor. In: Physical Review B. 92(6), 060501(R). ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.92.060501

@article{Kalcheim2015Inver-47147, title={Inverse proximity effect at superconductor-ferromagnet interfaces : Evidence for induced triplet pairing in the superconductor}, year={2015}, doi={10.1103/PhysRevB.92.060501}, number={6}, volume={92}, issn={1098-0121}, journal={Physical Review B}, author={Kalcheim, Yoav and Millo, Oded and Di Bernardo, Angelo and Pal, Avardeep and Robinson, Jason W. A.}, note={Article Number: 060501(R)} }

Robinson, Jason W. A. 2019-10-08T12:56:52Z Considerable evidence for proximity-induced triplet superconductivity on the ferromagnetic side of a superconductor-ferromagnet (S-F) interface now exists; however, the corresponding effect on the superconductor side has hardly been addressed. We have performed scanning tunneling spectroscopy measurements on NbN superconducting thin films proximity coupled to the half-metallic ferromagnet La<sub>2/3</sub>Ca<sub>1/3</sub>MnO<sub>3</sub> (LCMO) as a function of magnetic field. We have found that at zero and low applied magnetic fields the tunneling spectra on NbN typically show an anomalous gap structure with suppressed coherence peaks and, in some cases, a zero-bias conductance peak. As the field increases to the magnetic saturation of LCMO where the magnetization is homogeneous, the spectra become more BCS-like and the critical temperature of the NbN increases, implying a reduced proximity effect. Our results therefore suggest that triplet-pairing correlations are also induced in the S side of an S-F bilayer. 2015 Kalcheim, Yoav 2019-10-08T12:56:52Z Kalcheim, Yoav Di Bernardo, Angelo Millo, Oded Millo, Oded Pal, Avardeep eng Pal, Avardeep Inverse proximity effect at superconductor-ferromagnet interfaces : Evidence for induced triplet pairing in the superconductor Di Bernardo, Angelo Robinson, Jason W. A.

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