Superconductivity in an anomalously tetragonal YB2C3O6.62 single crystal: A possible singularity in the structural phase diagram

T. Frello; N.H. Andersen; M. Baziljevich; T.H. Johansen; Jean-Claude Grivel; H.F. Poulsen; M. von Zimmermann; J.R. Schneider; R. Liang; P. Dosanjh; W.N. Hardy; T. Wolf

doi:10.1103/PhysRevB.67.024509

Superconductivity in an anomalously tetragonal YB₂C₃O₆_.₆₂ single crystal: A possible singularity in the structural phase diagram

T. Frello, N.H. Andersen, M. Baziljevich, T.H. Johansen, Jean-Claude Grivel, H.F. Poulsen, M. von Zimmermann, J.R. Schneider, R. Liang, P. Dosanjh, W.N. Hardy, T. Wolf

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Abstract

During systematic studies of the structural phase diagram of YBa2Cu3O6+x (YBCO), a YBCO single crystal of oxygen concentration x=0.62 turned out to have a tetragonal crystal structure. By magneto-optical imaging of the expulsion of an applied magnetic field, it was shown that the sample was bulk superconducting. This makes the sample highly anomalous in two respects: with a stoichiometry of YBa2Cu3O6.62 the sample should have an orthorhombic symmetry, and a tetragonal undoped sample should not be superconducting at all. Our results corroborate previous findings of Topnikov [JETP Lett. 46, 577 (1987)] of a tetragonal superconducting YBCO crystal with x=0.62.

Original language	English
Journal	Physical Review B Condensed Matter
Volume	67
Issue number	2
Pages (from-to)	024509
Number of pages	5
ISSN	0163-1829
DOIs	https://doi.org/10.1103/PhysRevB.67.024509
Publication status	Published - 2003

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Frello, T., Andersen, N. H., Baziljevich, M., Johansen, T. H., Grivel, J-C., Poulsen, H. F., Zimmermann, M. V., Schneider, J. R., Liang, R., Dosanjh, P., Hardy, W. N., & Wolf, T. (2003). Superconductivity in an anomalously tetragonal YB₂C₃O₆_.₆₂ single crystal: A possible singularity in the structural phase diagram. Physical Review B Condensed Matter, 67(2), 024509. https://doi.org/10.1103/PhysRevB.67.024509

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abstract = "During systematic studies of the structural phase diagram of YBa2Cu3O6+x (YBCO), a YBCO single crystal of oxygen concentration x=0.62 turned out to have a tetragonal crystal structure. By magneto-optical imaging of the expulsion of an applied magnetic field, it was shown that the sample was bulk superconducting. This makes the sample highly anomalous in two respects: with a stoichiometry of YBa2Cu3O6.62 the sample should have an orthorhombic symmetry, and a tetragonal undoped sample should not be superconducting at all. Our results corroborate previous findings of Topnikov [JETP Lett. 46, 577 (1987)] of a tetragonal superconducting YBCO crystal with x=0.62.",

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Frello, T, Andersen, NH, Baziljevich, M, Johansen, TH, Grivel, J-C , Poulsen, HF, Zimmermann, MV, Schneider, JR, Liang, R, Dosanjh, P, Hardy, WN & Wolf, T 2003, 'Superconductivity in an anomalously tetragonal YB₂C₃O₆_.₆₂ single crystal: A possible singularity in the structural phase diagram', Physical Review B Condensed Matter, vol. 67, no. 2, pp. 024509. https://doi.org/10.1103/PhysRevB.67.024509

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T1 - Superconductivity in an anomalously tetragonal YB2C3O6.62 single crystal: A possible singularity in the structural phase diagram

AU - Frello, T.

AU - Andersen, N.H.

AU - Baziljevich, M.

AU - Johansen, T.H.

AU - Grivel, Jean-Claude

AU - Poulsen, H.F.

AU - Zimmermann, M. von

AU - Schneider, J.R.

AU - Liang, R.

AU - Dosanjh, P.

AU - Hardy, W.N.

AU - Wolf, T.

PY - 2003

Y1 - 2003

N2 - During systematic studies of the structural phase diagram of YBa2Cu3O6+x (YBCO), a YBCO single crystal of oxygen concentration x=0.62 turned out to have a tetragonal crystal structure. By magneto-optical imaging of the expulsion of an applied magnetic field, it was shown that the sample was bulk superconducting. This makes the sample highly anomalous in two respects: with a stoichiometry of YBa2Cu3O6.62 the sample should have an orthorhombic symmetry, and a tetragonal undoped sample should not be superconducting at all. Our results corroborate previous findings of Topnikov [JETP Lett. 46, 577 (1987)] of a tetragonal superconducting YBCO crystal with x=0.62.

AB - During systematic studies of the structural phase diagram of YBa2Cu3O6+x (YBCO), a YBCO single crystal of oxygen concentration x=0.62 turned out to have a tetragonal crystal structure. By magneto-optical imaging of the expulsion of an applied magnetic field, it was shown that the sample was bulk superconducting. This makes the sample highly anomalous in two respects: with a stoichiometry of YBa2Cu3O6.62 the sample should have an orthorhombic symmetry, and a tetragonal undoped sample should not be superconducting at all. Our results corroborate previous findings of Topnikov [JETP Lett. 46, 577 (1987)] of a tetragonal superconducting YBCO crystal with x=0.62.

KW - 5-I nano

U2 - 10.1103/PhysRevB.67.024509

DO - 10.1103/PhysRevB.67.024509

M3 - Journal article

VL - 67

SP - 024509

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 2