Anomalous spin-pumping behavior of half-metallic ferromagnet/d-wave superconductor heterostructures
Abstract
Spin-pumping experiments in superconductor/ferromagnet heterostructures, which probe spinsinking by the superconductor, have revealed a variety of complex behaviors. Most experimental studies have focused on conventional s-wave superconductors combined with metallic or insulating ferromagnets. Here, we study a d-wave superconductor paired with a halfmetallic ferromagnet, in epitaxial YBa₂Cu₃O7-δ/La0.7Sr0.3MnO₃ heterostructures with two crystalline orientations: one in which YBCO is c-axis oriented, and the other in which YBCO grows along the (103) direction. Using ferromagnetic resonance (FMR), we probe the temperature-dependent Gilbert damping coefficient α. For (103) heterostructures, α(T) initially decreases below Tc, but then increases at lower temperatures, eventually exceeding normalstate levels. This behavior can be understood in terms of the opening of the superconducting gap and spin transport via nodal quasiparticles, whose contribution is enhanced when the abplane of YBCO is exposed at the interface. In stark contrast, c-axis heterostructures exhibit a pronounced enhancement of α(T) below TC, peaking at ~0.65-0.7TC before decaying. This anomaly suggests the dominance of interfacial Andreev bound states, arising from a locally suppressed superconducting order parameter due to proximity effects with the half-metallic LSMO.
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BibTeX
@article{hassan2026anomalous,
title = {{Anomalous spin-pumping behavior of half-metallic ferromagnet/d-wave superconductor heterostructures}},
author = {Hadi Hassan and Santiago Carreira and M. Cabero and F. Martinet and Alexander Buzdin and Jacobo Santamaria and Javier Villegas},
journal = {Physical Review Materials},
year = {2026},
month = may,
doi = {10.1103/t7vq-dl3f},
eprint = {2605.12381},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05774733v1},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Anomalous spin-pumping behavior of half-metallic ferromagnet/d-wave superconductor heterostructures
AU - Hadi Hassan
AU - Santiago Carreira
AU - M. Cabero
AU - F. Martinet
AU - Alexander Buzdin
AU - Jacobo Santamaria
AU - Javier Villegas
PY - 2026
DA - 2026/05/22
JO - Physical Review Materials
DO - 10.1103/t7vq-dl3f
UR - https://hal.science/hal-05774733v1
AB - Spin-pumping experiments in superconductor/ferromagnet heterostructures, which probe spinsinking by the superconductor, have revealed a variety of complex behaviors. Most experimental studies have focused on conventional s-wave superconductors combined with metallic or insulating ferromagnets. Here, we study a d-wave superconductor paired with a halfmetallic ferromagnet, in epitaxial YBa₂Cu₃O7-δ/La0.7Sr0.3MnO₃ heterostructures with two crystalline orientations: one in which YBCO is c-axis oriented, and the other in which YBCO grows along the (103) direction. Using ferromagnetic resonance (FMR), we probe the temperature-dependent Gilbert damping coefficient α. For (103) heterostructures, α(T) initially decreases below Tc, but then increases at lower temperatures, eventually exceeding normalstate levels. This behavior can be understood in terms of the opening of the superconducting gap and spin transport via nodal quasiparticles, whose contribution is enhanced when the abplane of YBCO is exposed at the interface. In stark contrast, c-axis heterostructures exhibit a pronounced enhancement of α(T) below TC, peaking at ~0.65-0.7TC before decaying. This anomaly suggests the dominance of interfacial Andreev bound states, arising from a locally suppressed superconducting order parameter due to proximity effects with the half-metallic LSMO.
SN - 2475-9953
ER -