Strain-modulated Mott transition in EuNiO3 ultrathin films

Article

关键词: METAL-INSULATOR-TRANSITION;    PRNIO3;    NDNIO3;    EARTH;    PR;    EU;    SM;    ND;   

DOI  :  10.1103/PhysRevB.88.075116

来源: SCIE

【 摘 要 】

A series of ultrathin epitaxial films of EuNiO3 (ENO) were grown on a set of substrates traversing from compressive (-2.4%) to tensile (+2.5%) lattice mismatch. On moving from tensile to compressive strain, transport measurements demonstrate a successively suppressed Mott insulating behavior eventually resulting in a complete suppression of the insulating state at high compressive strain. Corroborating these findings, resonant soft x-ray absorption spectroscopy at the Ni L-3,L-2 edge reveals the presence of a strong multiplet splitting in the tensile strained samples that progressively weakens with increasing compressive strain. Combined with cluster calculations, the results show how cumulatively enhanced covalency (i.e., bandwidth) between Ni d and O p orbital derived states leads to the emergent metallic ground state not attainable in the bulk ENO.

【 授权许可】

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