Proximity Effects and Quantum Dissipation in the Chains of YBa$_2$Cu$_3$O$_{6+x}

Details Proximity Effects and Quantum Dissipation in the Chains of YBa$_2$Cu$_3$O$_{6+x} Proximity Effects and Quantum Dissipation in the Chains of YBa$_2$Cu$_3$O$_{6+x}

2000-08-08

arxiv.org/abs/cond-mat/0008128v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.247002

We argue that the results of recent scanning tunneling microscopy, angle-resolved photoemission and infrared spectroscopy experiments on the CuO chains of YBa$_2$Cu$_3$O$_{6+x}$ are consistently explained within a proximity model by the interplay of a coherent chain-plane and an incoherent interchain coupling. We show that the CuO$_2$ planes act as an ohmic heat bath for the electronic degrees of freedom in the chains which induces a substantial quantum dissipation. Below the planar $T_c$, charge excitations in the chains acquire a universal superconducting gap whose phase and magnitude are momentum dependent. We predict that the magnitude of this gap varies non-monotonically with the hole concentration in the chains.

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