Alternate cleavage structure and electronic inhomogeneity in Ca-doped YBa$_2$Cu$_3$O$_{7-δ}$
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
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2024
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| _version_ | 1866911490650406912 |
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| author | Little, Larissa B. Coulter, Jennifer Kang, Ruizhe Zeljkovic, Ilija Huang, Dennis Song, Can-Li Loew, Toshinao Chia, Han-Jong Hoffman, Jason D. Markert, John T. Keimer, Bernhard Kozinsky, Boris Hoffman, Jennifer E. |
| author_facet | Little, Larissa B. Coulter, Jennifer Kang, Ruizhe Zeljkovic, Ilija Huang, Dennis Song, Can-Li Loew, Toshinao Chia, Han-Jong Hoffman, Jason D. Markert, John T. Keimer, Bernhard Kozinsky, Boris Hoffman, Jennifer E. |
| contents | YBa$_2$Cu$_3$O$_{7-δ}$ (YBCO) has favorable macroscopic superconducting properties of $T_\mathrm{c}$ up to 93 K and $H_{c2}$ up to 150 T. However, its nanoscale electronic structure remains mysterious because bulk-like electronic properties are not preserved near the surface of cleaved samples for easy access by local or surface-sensitive probes. It has been hypothesized that Ca-doping at the Y site could induce an alternate cleavage plane that mitigates this issue. We use scanning tunneling microscopy (STM) to study both Ca-free and 10% Ca-doped YBCO, and find that the Ca-doped samples do indeed cleave on an alternate plane, yielding a spatially-disordered partial (Y,Ca) layer. Our density functional theory calculations support the increased likelihood of this new cleavage plane in Ca-doped YBCO. On this surface, we image a superconducting gap with average value 24 $\pm$ 3 meV and characteristic length scale 1-2 nm, similar to Bi-based high-$T_\mathrm{c}$ cuprates, but the first map of gap inhomogeneity in the YBCO family. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_03238 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Alternate cleavage structure and electronic inhomogeneity in Ca-doped YBa$_2$Cu$_3$O$_{7-δ}$ Little, Larissa B. Coulter, Jennifer Kang, Ruizhe Zeljkovic, Ilija Huang, Dennis Song, Can-Li Loew, Toshinao Chia, Han-Jong Hoffman, Jason D. Markert, John T. Keimer, Bernhard Kozinsky, Boris Hoffman, Jennifer E. Superconductivity YBa$_2$Cu$_3$O$_{7-δ}$ (YBCO) has favorable macroscopic superconducting properties of $T_\mathrm{c}$ up to 93 K and $H_{c2}$ up to 150 T. However, its nanoscale electronic structure remains mysterious because bulk-like electronic properties are not preserved near the surface of cleaved samples for easy access by local or surface-sensitive probes. It has been hypothesized that Ca-doping at the Y site could induce an alternate cleavage plane that mitigates this issue. We use scanning tunneling microscopy (STM) to study both Ca-free and 10% Ca-doped YBCO, and find that the Ca-doped samples do indeed cleave on an alternate plane, yielding a spatially-disordered partial (Y,Ca) layer. Our density functional theory calculations support the increased likelihood of this new cleavage plane in Ca-doped YBCO. On this surface, we image a superconducting gap with average value 24 $\pm$ 3 meV and characteristic length scale 1-2 nm, similar to Bi-based high-$T_\mathrm{c}$ cuprates, but the first map of gap inhomogeneity in the YBCO family. |
| title | Alternate cleavage structure and electronic inhomogeneity in Ca-doped YBa$_2$Cu$_3$O$_{7-δ}$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2402.03238 |