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

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.

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

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

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Non-conservation of Density of States in Bi22​Sr22​CaCu22​Oyy​: Coexistence of Pseudogap and Superconducting gap

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Non-conservation of Density of States in Bi22​Sr22​CaCu22​Oyy​: Coexistence of Pseudogap and Superconducting gap

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

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

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