Orbital Hybridization and Magnetic Coupling at Cuprate–Manganite Interfaces Driven by Manganite Doping
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- ShanghaiTech Univ. (China)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Tor Vergata Univ. of Rome (Italy); National Research Council (CNR), Genova (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)
- Univ. of Salerno, Fisciano (Italy); TASC National Lab., Trieste (Italy); National Research Council (CNR), Genova (Italy). Inst. for Superconductors, Innovative Materials and Devices (CNR-SPIN)
- Cornell Univ., Ithaca, NY (United States)
- ALBA Synchrotron Light Source, Barcelona (Spain)
Fundamental understanding of interface mechanisms that generate unexpected physical properties in the cuprate/manganite heterostructures is essential for possible applications as spintronic devices. In this study, CaCuO2/La1–xSrxMnO3 (CCO/LSMO) superlattices are investigated, where the infinite-layer cuprate CCO does not have apical oxygen for Cu in the Ca-plane so that the Mn–O–Cu superexchange coupling can be only present at the MnO2–(La,Sr)O–CuO2 interface. Two different doping states for the manganites are studied, namely x = 0.1 and x = 0.3, corresponding to the ferromagnetic insulating and ferromagnetic metallic states, respectively, in the manganite phase diagram. Linear and circular dichroism in X-ray absorption by synchrotron radiation at Cu and Mn L-edges clearly demonstrate that in the absence of apical oxygen in the cuprate block, the magnetic coupling between the LSMO and CCO is weakly ferromagnetic when LSMO is metallic, while it is antiferromagnetic when LSMO is insulating, along with an increased Cu 3d(3z2–r2) and Mn 3d(3z2–r2) orbital occupation. It is proposed that the Mn 3d valence band upward shift driven by the enhancement of Mn3+ content in the underdoped sample enhances the orbital hybridization. The stronger hybridization at the interface MnO2–(La,Sr)O–CuO2 gives rise to the antiferromagnetic coupling between cuprate and underdoped manganite.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0012704
- OSTI ID:
- 1677670
- Report Number(s):
- BNL-219964-2020-JAAM
- Journal Information:
- Advanced Quantum Technologies, Vol. 3, Issue 6; ISSN 2511-9044
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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