s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8

Details s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8 s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8

2007-05-04

arxiv.org/abs/0705.0577v1

Journal of Superconductivity and Novel Magnetism 21, 1557 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

To clarify the order parameter symmetry of cuprates, the magnetic penetration depth $\lambda$ was measured along the crystallographic directions $a$, $b$, and $c$ in single crystals of YBa$_2$Cu$_4$O$_8$ via muon spin rotation. This method is direct, bulk sensitive, and unambiguous. The temperature dependences of $\lambda_a^{-2}$ and $\lambda_b^{-2}$ exhibit an inflection point at low temperatures as is typical for two-gap superconductivity (TGS) with $s+d-$wave character in the planes. Perpendicular to the planes a pure s-wave gap is observed thereby highlighting the important role of c-axis effects. We conclude that these are generic and universal features in the bulk of cuprates.

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