Scanning tunneling microscopy studies of the cuprate superconductor HgBa2Ca2Cu3O8+δ
Fan Zhang, Xingyuan Hou, Wenshan Hong, Yubing Tu, Tao Han, Zongyuan Zhang, Yuan Li, Lei Shan
DOI 10.1103/PhysRevB.109.085132 · Physical Review B
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Abstract
We report on scanning tunneling microscopy and spectroscopy studies of the slightly underdoped cuprate superconductor HgBa2Ca2Cu3O8+δ, which has an onset Tc≈120 K. Disordered HgO-terminated surfaces were observed after sample cleaving in ultrahigh vacuum, revealing spatially inhomogeneous energy gaps with a low-lying V-shaped structure and the ubiquitous mode features. Similar to Bi-family cuprate superconductors, vortex cores were identified by the suppression of superconducting coherence peaks and the emergence of in-gap features. Superconductivity near step edges is also strongly suppressed over several coherence lengths, forming an effective interface to the superconducting region, where the local spectra show a weak zero-bias conductance peak arising from the Andreev bound states. These results are expected from the widely believed d-wave nature in cuprates, demonstrating a platform for studying unconventional superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | onset |
| Bi2Sr2Can-1CunO2n+4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CaxNa2-xCuO2Cl2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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