In situ temperature-dependent x-ray-absorption spectroscopic studies for the mercury-based superconductors
Seong-Ju Hwang, Jin-Ho Choy, Nam Hwi Hur
DOI 10.1103/PhysRevB.57.1259 · Physical Review B
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Abstract
In situ temperature-dependent x-ray-absorption spectroscopic studies have been carried out for the mercury-based cuprate superconductor Hg0.5Tl0.5Ba2(Ca0.86Sr0.14)2Cu3O8+δ, in order to examine the evolution of electronic and geometric structures below and above the superconducting transition temperature (Tc=128K). According to the in situ Cu K-edge x-ray-absorption near-edge structure (XANES) analyses, it is found that the copper valence is remarkably enhanced with a partial formation of Cu(III) ions in the superconducting state, reflecting a lattice instability around copper upon the superconducting transition, which is also confirmed by the in situ Hg LIII- and Tl LIII-edge XANES analyses. Such a finding underlines that the phonon-mediated pairing mechanism makes a significant contribution to the superconductivity of the Hg-based cuprates. On the other hand, the systematic Cu K-edge XANES spectroscopic studies for a series of Hg1−xTlxBa2(Ca0.86Sr0.14)n−1CunO2n+2+δ (x=0 and 0.5; n=1, 2, and 3) superconductors have also been performed, which allows us to determine the effects of the Tl substitution and the number of (Cu-O) sheet per formula unit (n) on the hole concentration of the copper-oxygen layer.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Hg0.5Tl0.5Ba2(Ca0.86Sr0.14)2Cu3O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure not reported | unknown |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| HgBa2Ca0.86Sr0.14Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | unknown |
| HgBa2Ca0.86Sr0.14Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 124 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2Ca0.86Sr0.14Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 122 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2Ca0.86Sr0.14Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2Ca0.86Sr0.14Cu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 122 | Pressure not reported | unknown |
| HgBa2(Ca0.86Sr0.14)2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 126 | Pressure not reported | unknown |
| HgBa2(Ca0.86Sr0.14)2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 132 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2(Ca0.86Sr0.14)2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2(Ca0.86Sr0.14)2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 120 | Pressure not reported | unknown |
| Hg0.5Tl0.5Ba2(Ca0.86Sr0.14)2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 132 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 160 | Pressure not reported | unknown |
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