2024-03-28T10:37:27Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1770922021-08-18T10:59:12Zcom_10261_115com_10261_3col_10261_368
DIGITAL.CSIC
author
Strambini, E.
author
Golovach, V. N.
author
Simoni, Giorgio de
author
Moodera, J. S.
author
Bergeret, F. S.
author
Giazotto, F.
funder
Ministerio de Economía y Competitividad (España)
funder
European Commission
funder
European Research Council
funder
National Science Foundation (US)
funder
Office of Naval Research (US)
funder
John Templeton Foundation
2019-03-01T12:31:31Z
2019-03-01T12:31:31Z
2017
Physical Review Materials 1(5): 054402 (2017)
arXiv:1705.04795v2
http://hdl.handle.net/10261/177092
10.1103/PhysRevMaterials.1.054402
http://dx.doi.org/10.13039/100000006http://dx.doi.org/10.13039/501100003329http://dx.doi.org/10.13039/100000925http://dx.doi.org/10.13039/100000001http://dx.doi.org/10.13039/501100000780http://dx.doi.org/10.13039/501100000781
A ferromagnetic insulator in contact with a superconductor is known to induce an exchange splitting of the singularity in the Bardeen-Cooper-Schrieffer (BCS) density of states (DoS). The magnitude of the splitting is proportional to the exchange field that penetrates into the superconductor to a depth comparable with the superconducting coherence length and which ranges in magnitude from a few to a few tens of tesla. We study this magnetic proximity effect in EuS/Al bilayers and show that the domain structure of the EuS affects the positions and the line shapes of the exchange-split BCS peaks. Remarkably, a clear exchange splitting is observed even in the unmagnetized state of the EuS layer, suggesting that the domain size of the EuS is comparable with the superconducting coherence length. Upon magnetizing the EuS layer, the splitting increases while the peaks change shape. Conductance measurements as a function of bias voltage at the lowest temperatures allowed us to relate the line shape of the split BCS DoS to the characteristic domain structure in the ultrathin EuS layer. These results pave the way to engineering triplet superconducting correlations at domain walls in EuS/Al bilayers. Furthermore, the hard gap and large splitting observed in our tunneling spectroscopy measurements make EuS/Al an excellent candidate for substituting strong magnetic fields in experiments studying Majorana bound states.
eng
openAccess
Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
artículo
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URL
https://digital.csic.es/bitstream/10261/177092/1/revealspectro.pdf
File
MD5
a399d41ea28ca962edd39f87503b80dd
2093757
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revealspectro.pdf