Finite-size and pressure effects in YBa_2Cu_4O_8 probed by magnetic field penetration depth measurements

Details Finite-size and pressure effects in YBa_2Cu_4O_8 probed by magnetic field penetration depth measurements Finite-size and pressure effects in YBa_2Cu_4O_8 probed by magnetic field penetration depth measurements

2004-02-15

arxiv.org/abs/cond-mat/0402398v1

Phys. Rev. B, v. 70, 144515 (2004).

Physics

Condensed Matter

Superconductivity

7 pages, 6 figures

Scientific paper

10.1103/PhysRevB.70.144515

We explore the combined pressure and finite-size effects on the in-plane penetration depth \lambda_{ab} in YBa_2Cu_4O_8. Even though this cuprate is stoichiometric the finite-size scaling analysis of \lambda_{ab}^{-2}(T) uncovers the granular nature and reveals domains with nanoscale size L_{c} along the c-axis. L_{c} ranges from 33.2 Angstrom to 28.9 Angstrom at pressures from 0.5 to 11.5 kbar. These observations raise serious doubts on the existence of a phase coherent macroscopic superconducting state in cuprate superconductors.

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