Dual-Sublattice Ferromagnetism Driven by Cooperative Double Exchange and Superexchange at NdNiO3/CaMnO3 Interfaces
Abstract
Engineering emergent ferromagnetism at correlated-oxide interfaces offers a powerful route to creating collective states that do not exist in the parent materials. Here, we show that interfacial valence reconstruction in NdNiO3/CaMnO3 superlattices generates dual-sublattice ferromagnetism involving both Mn and Ni. Depth-resolved standing-wave X-ray photoelectron spectroscopy reveals enhanced Mn3+ character on the CaMnO3 side of the interface and enhanced Ni2+ character on the NdNiO3 side, establishing the configurations required for Mn4+-O-Mn3+ double exchange and Ni2+-O-Mn4+ superexchange, respectively. At low temperature, element-specific XMCD reveals ferromagnetic responses from both sublattices, with the Ni response concentrated predominantly in the Ni2+-derived spectral component that SW-XPS independently shows to be enhanced at the interface. Together, these results show that cooperative double exchange within CaMnO3 and superexchange across the interface couple the Mn and Ni sublattices, providing a general strategy for engineering interfacial ferromagnetism in correlated oxides.
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BibTeX
@misc{sheikh2026dualsublattice,
title = {{Dual-Sublattice Ferromagnetism Driven by Cooperative Double Exchange and Superexchange at NdNiO$_3$/CaMnO$_3$ Interfaces}},
author = {Sharup Sheikh and Uditha M. Jayathilake and Michael Terilli and Mikhail Kareev and Jay R. Paudel and Arian Arab and Christoph Klewe and Tien-Lin Lee and Jak Chakhalian and Alexander X. Gray},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21002},
eprint = {2609.21002},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21002},
}
RIS
TY - UNPB
TI - Dual-Sublattice Ferromagnetism Driven by Cooperative Double Exchange and Superexchange at NdNiO_3/CaMnO_3 Interfaces
AU - Sharup Sheikh
AU - Uditha M. Jayathilake
AU - Michael Terilli
AU - Mikhail Kareev
AU - Jay R. Paudel
AU - Arian Arab
AU - Christoph Klewe
AU - Tien-Lin Lee
AU - Jak Chakhalian
AU - Alexander X. Gray
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.21002
UR - https://arxiv.org/abs/2609.21002
AB - Engineering emergent ferromagnetism at correlated-oxide interfaces offers a powerful route to creating collective states that do not exist in the parent materials. Here, we show that interfacial valence reconstruction in NdNiO_3/CaMnO_3 superlattices generates dual-sublattice ferromagnetism involving both Mn and Ni. Depth-resolved standing-wave X-ray photoelectron spectroscopy reveals enhanced Mn^3+ character on the CaMnO_3 side of the interface and enhanced Ni^2+ character on the NdNiO_3 side, establishing the configurations required for Mn^4+-O-Mn^3+ double exchange and Ni^2+-O-Mn^4+ superexchange, respectively. At low temperature, element-specific XMCD reveals ferromagnetic responses from both sublattices, with the Ni response concentrated predominantly in the Ni^2+-derived spectral component that SW-XPS independently shows to be enhanced at the interface. Together, these results show that cooperative double exchange within CaMnO_3 and superexchange across the interface couple the Mn and Ni sublattices, providing a general strategy for engineering interfacial ferromagnetism in correlated oxides.
ER -