Superconducting and normal-state properties of YBa2(Cu1−xZnx)4O8
Takayuki Miyatake, Koji Yamaguchi, Tsutomu Takata, Naoki Koshizuka, Shoji Tanaka
DOI 10.1103/PhysRevB.44.10139 · Physical Review B
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Abstract
We investigate the effect of Zn substitution for Cu on the lattice parameters and the temperature dependences of resistivity and susceptibility in YBa2Cu4O8. Samples of YBa2(Cu1−xZnx)4O8 with x=0 to 0.1 were prepared by a high-oxygen-pressure technique. As the Zn context is increased, the lattice parameters of the a and b axes increase, but that of the c axis decreases. The oxygen content is independent of the Zn concentration. The superconducting transition temperature Tc decreases monotonically with increasing Zn concentration, with a coefficient of -21 K/at.%, and superconductivity vanishes at x=0.037. The Zn doping induces the local moment coming from Cu2+, and the normal-state susceptibility shows Curie-Weiss-like behavior. Some possible explanations for the suppression of Tc by Zn doping are provided.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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