Non-conservation of Density of States in Bi$_2$Sr$_2$CaCu$_2$O$_y$: Coexistence of Pseudogap and Superconducting gap

Anjan K. Gupta; K. -W. Ng

doi:10.1209/epl/i2002-00456-2

paper

Non-conservation of Density of States in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{y}$ : Coexistence of Pseudogap and Superconducting gap

arXiv:cond-mat/0202450 · doi:10.1209/epl/i2002-00456-2

Abstract

The tunneling spectra obtained within the ab-plane of Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{y}$ (Bi2212) for temperatures below and above the critical temperature (T $_{c}$ ) are analyzed. We find that the tunneling conductance spectra for the underdoped compound in the superconducting state do not follow the conservation of states rule. There is a consistent loss of states for the underdoped BI2212 implying an underlying depression in the density of states (DOS) and hence the pseudogap near the Fermi energy (E $_{F}$ ). Such an underlying depression can also explain the peak-dip-hump structure observed in the spectra. Furthermore, the conservation of states is recovered and the dip-hump structure disappears after normalizing the low temperature spectra with that of the normal state. We argue that this is a direct evidence for the coexistence of a pseudogap with the superconducting gap.

5 pages, 4 figures

Non-conservation of Density of States in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{y}$ : Coexistence of Pseudogap and Superconducting gap

Abstract

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Cited by in corpus (3)

Non-conservation of Density of States in Bi2​Sr2​CaCu2​Oy​: Coexistence of Pseudogap and Superconducting gap

Abstract

References in corpus (2)

Cited by in corpus (3)

Non-conservation of Density of States in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{y}$ : Coexistence of Pseudogap and Superconducting gap