Preparation and properties of superconducting Y(Ba1−xSrx)2Cu4O8

Takahiro Wada; Takeshi Sakurai; Nobuo Suzuki; Shin-ichi Koriyama; Hisao Yamauchi; Shoji Tanaka

doi:10.1103/PhysRevB.41.11209

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Preparation and properties of superconducting Y(Ba1−xSrx)2Cu4O8

Takahiro Wada, Takeshi Sakurai, Nobuo Suzuki, Shin-ichi Koriyama, Hisao Yamauchi, Shoji Tanaka

DOI 10.1103/PhysRevB.41.11209 · Physical Review B

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Abstract

We have prepared single-phase or near-single-phase Y(Ba1−xSrx)2Cu4O8 (0≤x≤0.4) samples by means of a high-oxygen-pressure technique using an O2 hot isostatic pressing. All the lattice constants, a, b, and c, of Y(Ba1−xSrx)2Cu4O8 monotonically decreased with increasing Sr content. The superconducting transition temperatures of these samples were nearly constant, being around 80 K, while the Tc’s of Y(Ba1−xSrx)2Cu3Oz (z∼7) samples decreased with increasing Sr content. When Y in Y(Ba0.8Sr0.2)2Cu4O8 was partially substituted by Ca, the superconducting critical temperature increased to near 90 K.

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	onset
Y(Ba0.95Sr0.05)2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	81	Pressure not reported	onset
Y(Ba0.9Sr0.1)2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82	Pressure not reported	onset
Y(Ba0.8Sr0.2)2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82	Pressure not reported	onset
Y(Ba0.7Sr0.3)2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure not reported	onset
Y(Ba0.6Sr0.4)2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure not reported	onset
YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure not reported	onset
Y(Ba0.9Sr0.1)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	94	Pressure not reported	onset
Y(Ba0.8Sr0.2)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	onset
Y(Ba0.7Sr0.3)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	onset
Y(Ba0.6Sr0.4)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	onset
Y(Ba0.5Sr0.5)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	onset
Y(Ba0.4Sr0.6)2Cu3O6.8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	83	Pressure not reported	onset