Pressure dependence of the superconducting transition temperature of HgBa2CaCu2O6+δ as a function of carrier concentration
Xiaojia Chen, Zhengkuan Jiao
DOI 10.1103/PhysRevB.56.6302 · Physical Review B
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Abstract
A phenomenological analysis for the pressure-induced change of the hole concentration in the CuO2 layers (nH) is developed. This effect along with the pressure-induced change of the maximum value of critical temperature (Tc) enables us to take account of the external pressure dependence of Tc on different oxygen doping and different ambient Tc on the basis of the inverted parabolic relationship between Tc and nH. Detailed calculations for HgBa2CaCu2O6+δ (δ=0.08∼0.35) show that the Tc(P) curve with a saturation at large pressure in the nearly optimally doped but slightly underdoped material is located above the curve with a saturation at relatively low pressure in the slightly overdoped one, and that an experimental curve for the optimal doping lies between the two curves. It is found that the pressure coefficient (dTc/dP) decreases with increasing pressure and the initial pressure coefficient declines monotonously with the increase of hole concentration.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 135 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | Pressure not reported | unknown |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure unresolved | unknown |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 154 | 29 GPa | unknown |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 127 | Pressure unresolved | onset |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 144 | 8 GPa | onset |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 111 | Pressure unresolved | unknown |
| HgBa2CaCu2O6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure unresolved | unknown |
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