Effect of sulfur on the superconductivity of RBa2Cu3O7

I. Felner; B. Barbara

doi:10.1103/PhysRevB.37.5820

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Effect of sulfur on the superconductivity of RBa2Cu3O7

I. Felner, B. Barbara

DOI 10.1103/PhysRevB.37.5820 · Physical Review B

T1

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Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

The single-phase high-Tc superconductor RBa2Cu3O6S R=Nd, Eu, Gd, Y, Er have been prepared and studied by x-ray diffraction and dc magnetometry. For Gd and Y the compounds with sulfur have a larger unit cell and yet have the same Tc. For R=Eu, Nd substitution of 1 oxygen by sulfur suppresses Tc and causes the crystal structure to change from orthorhombic to tetragonal. TbBa2Cu3O7−xSx, x=0,1 systems crystallize in a perovskite-related cubic structure and are neither superconducting nor magnetically ordered down to 2 K. The sulfur oxidizes the Tb so that it is tetravalent.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
NdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88	Pressure not reported	onset
NdBa2Cu3O6S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	69	Pressure not reported	onset
NdBa2Cu3O5S2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	56	Pressure not reported	onset
EuBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	onset
EuBa2Cu3O6S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure not reported	onset
GdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	onset
GdBa2Cu3O6S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
YBa2Cu3O6S Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown