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DOE OSTI · 1840646

Visualizing the unusual spectral weight transfer in DyBa2Cu3O7–δ thin film

Li, Hui·Du, Zengyi·Wu, Ze-Bin·Putzky, Daniel·Joo, Sang Hyun·Kundu, Asish K.·Xu, Xiaotao·Shi, Xiaoyan·Lee, Jinho·Pasupathy, Abhay N.·Logvenov, Gennady·Keimer, Bernhard·Valla, Tonica·Božović, Ivan·Drozdov, Ilya K.·Fujita, Kazuhiro
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Abstract

Abstract We report a Spectroscopic Imaging Scanning Tunneling Microscopy (SI-STM) study of a DyBa 2 Cu 3 O 7-δ (DBCO) thin film ( T c ~ 79 K) synthesized by the molecular beam epitaxy (MBE). We observed an unusual transfer of spectral weight in the local density of states (LDOS) spectra occurring only within the superconducting gap. By a systematic control of the tip-sample distance and the junction resistance, we demonstrate that the spectral weight transfer can be switched at a nano-meter length scale. These results suggest that an interaction between the STM tip and the sample alters the electronic configurations in the film. This probably originates from a combination of an intrinsic band bending at the interface between the surface and the bulk, and a tip-induced band bending. These results may open a new avenue for band engineering and applications of thin films of high- T c cuprates.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYelectronic properties and materialssuperconducting properties and materials

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Li, Hui, Du, Zengyi, Wu, Ze-Bin, Putzky, Daniel, Joo, Sang Hyun, Kundu, Asish K., Xu, Xiaotao, Shi, Xiaoyan, Lee, Jinho, Pasupathy, Abhay N., Logvenov, Gennady, Keimer, Bernhard, Valla, Tonica, Božović, Ivan, Drozdov, Ilya K., Fujita, Kazuhiro. 2022-01-17. Visualizing the unusual spectral weight transfer in DyBa2Cu3O7–δ thin film. https://doi.org/10.1038/s41598-021-04692-9

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