Enhanced Critical Field of Superconductivity at an Oxide Interface

The nature of superconductivity and its interplay with strong spin-orbit coupling at the KTaO3(111) interfaces remains a subject of debate. To address this problem, we grew epitaxial LaMnO3/KTaO3(111) heterostructures. We show that superconductivity is robust against the in-plane magnetic field, wit...

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Published inarXiv.org
Main Authors Al-Tawhid, Athby H, Poage, Samuel J, Salmani-Rezaie, Salva, Shalinee Chikara, Muller, David A, Kumah, Divine P, Gastiasoro, Maria N, Lorenzana, Jose, Ahadi, Kaveh
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.04.2023
Subjects
Carrier density
Critical field (superconductivity)
Elementary excitations
Heterostructures
Lanthanum compounds
Magnetic fields
Magnetic moments
Order parameters
Parameter sensitivity
Physics - Superconductivity
Spin-orbit interactions
Superconductivity
Superconductors
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Summary:The nature of superconductivity and its interplay with strong spin-orbit coupling at the KTaO3(111) interfaces remains a subject of debate. To address this problem, we grew epitaxial LaMnO3/KTaO3(111) heterostructures. We show that superconductivity is robust against the in-plane magnetic field, with the critical field of superconductivity reaching 25 T in optimally doped heterostructures. The superconducting order parameter is highly sensitive to carrier density. We argue that spin-orbit coupling drives the formation of anomalous quasiparticles with vanishing magnetic moment, providing the condensate significant immunity against magnetic fields beyond the Pauli paramagnetic limit. These results offer design opportunities for superconductors with extreme resilience against magnetic field.
Bibliography:SourceType-Working Papers-1
ObjectType-Working Paper/Pre-Print-1
content type line 50
ISSN:2331-8422
DOI:10.48550/arxiv.2304.14426