Micro-Raman study of the role of pressure in mercury-based superconductors
In-Sang Yang, Hye-Soo Shin, Hye-Gyong Lee, Seung-Joon Jeon, Hang-Sun Ahn, Jaejun Yu, Sergey Lee, Sung-Ik Lee, Nam H. Hur
DOI 10.1103/PhysRevB.51.644 · Physical Review B
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Abstract
Understanding the role of pressure in increasing Tc is a crucial issue in mercury-based superconductors. We report on the effect of pressure on the Raman frequency (ω) of the apical oxygen (OA) in Hg-OA-Cu bonds of HgBa2Can−1CunO2n+2+δ superconductors. For both Hg-1201 and Hg-1223, Δ(ω2/ω02)/ΔP is found to be strongly correlated with ΔTc/ΔP, where ω0 is the frequency at ambient pressure. Together with our local-density approximation total-energy phonon study of the OA-A1g Raman mode, it is concluded that the change of the OA Raman frequency is due to the change in Hg-OA bond strength, which may be directly related to the charge transfer between the CuO2 planes and the Hg-O layers.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure unresolved | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure unresolved | onset |
| HgBa2Ca2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | 30 GPa | unknown |
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