Electron-spin-resonance studies of the hole-doping effect on (Tl0.5Pb0.5)Sr2(Ca1−xYx)Cu2O7 high-Tc superconductors
Li Yeat Chen, Juh Tzeng Lue, R. S. Liu
DOI 10.1103/PhysRevB.52.12883 · Physical Review B
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Abstract
In this work, we attempt to investigate the relation between the hole-doping effect and electron spin resonance (ESR) spectra in the series of (Tl0.5Pb0.5)Sr2(Ca1−xYx)Cu2O7 high-Tc superconductors. The spin signal is absent for x=0.2 which is the optimal doping for obtaining a maximum Tc, while the ESR signals recover for the underdoped and overdoped samples. This result can be expressed by the slowing down of the superexchange force between next-neighboring copper ions which retrieve their native local moments by the increase or decrease of hole doping. The unexpected vanish of ESR spectra for the antiferromagnetic insulator at x=0.9 implicates a highly correlated spin fluctuation in the (Tl0.5Pb0.5)Sr2(Ca1−xYx)Cu2O7 system.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | Pressure not reported | onset |
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure not reported | onset |
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 106 | Pressure not reported | onset |
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | onset |
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
| (Tl0.5Pb0.5)Sr2(Ca1-xYx)Cu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | onset |
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