dorsal/arxiv
View SchemaEmergence of unconventional magnetic order in strain-engineered RuO2/TiO2 superlattices
| Authors | Seung Gyo Jeong, Seungjun Lee, Jin Young Oh, Bonnie Y. X. Lin, Anand Santhosh, James M. LeBeau, Alexander J. Grutter, Woo Seok Choi, Tony Low, Valeria Lauter, Bharat Jalan |
|---|---|
| Categories | |
| ArXiv ID | 2601.10518vv1 |
| URL | https://arxiv.org/abs/2601.10518 |
| License | http://creativecommons.org/licenses/by/4.0/ |
Abstract
The spin ordering in RuO2 remains a highly debated topic, owing to its elusive nature, with reports ranging from a nonmagnetic ground state to signatures of unconventional magnetic order. Here we provide the first unambiguous, and direct evidence of unconventional magnetism in epitaxial, fully strained RuO2/TiO2 superlattices on TiO2 (110) substrate grown by hybrid molecular beam epitaxy. Polarized neutron reflectometry reveals a finite magnetic moment localized within the compressively strained RuO2 layers, consistent with predictions obtained from first-principles calculations. Complementary density functional theory and X-ray photoemission spectroscopy show that epitaxial strain drives the Ru 4d states toward the Fermi level, triggering a Stoner-type instability that stabilizes non-compensated magnetic order. These unique results reveal that RuO2 exhibits unconventional magnetic states under epitaxial strain, which are not accessible in bulk and establish strain engineering as a powerful route to uncover and control magnetic phases in RuO2 and related oxides.
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"abstract": "The spin ordering in RuO2 remains a highly debated topic, owing to its elusive nature, with reports ranging from a nonmagnetic ground state to signatures of unconventional magnetic order. Here we provide the first unambiguous, and direct evidence of unconventional magnetism in epitaxial, fully strained RuO2/TiO2 superlattices on TiO2 (110) substrate grown by hybrid molecular beam epitaxy. Polarized neutron reflectometry reveals a finite magnetic moment localized within the compressively strained RuO2 layers, consistent with predictions obtained from first-principles calculations. Complementary density functional theory and X-ray photoemission spectroscopy show that epitaxial strain drives the Ru 4d states toward the Fermi level, triggering a Stoner-type instability that stabilizes non-compensated magnetic order. These unique results reveal that RuO2 exhibits unconventional magnetic states under epitaxial strain, which are not accessible in bulk and establish strain engineering as a powerful route to uncover and control magnetic phases in RuO2 and related oxides.",
"arxiv_id": "2601.10518",
"authors": [
"Seung Gyo Jeong",
"Seungjun Lee",
"Jin Young Oh",
"Bonnie Y. X. Lin",
"Anand Santhosh",
"James M. LeBeau",
"Alexander J. Grutter",
"Woo Seok Choi",
"Tony Low",
"Valeria Lauter",
"Bharat Jalan"
],
"categories": [
"cond-mat.mtrl-sci"
],
"license": "http://creativecommons.org/licenses/by/4.0/",
"title": "Emergence of unconventional magnetic order in strain-engineered RuO2/TiO2 superlattices",
"url": "https://arxiv.org/abs/2601.10518",
"version": "v1"
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