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Magnetic field as a probe of gap energy scales in YBCO

N. D. Whelan, J. P. Carbotte

cond-mat.supr-conarXiv:cond-mat/9911145

Abstract

Among high Tc materials, the YBCO (YBa2Cu3O7-x) compounds are special since they have superconducting chains as well as planes. We show that a discontinuity in the density of states as a function of magnetic field may appear at a new energy scale, characteristic of the chain and distinct from that set by the d wave gap. This is observable in experimental studies of the thermodynamical properties of these systems, such as the specific heat.

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