Direct Evidence of Two Gaps in Underdoped Bi2212

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This short paper summarizes the results we presented at the LEHTSC2007 conference. Recent doping and temperature dependence of angle-resolved photoemission data of underdoped superconducting cuprate Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (Bi2212) have revealed the presence of two energy scales exhibiting distinct behaviours. One, which dominates the antinodal region, increases with underdoping and does not show obvious temperature dependence across Tc. This is a behaviour known for more than a decade and considered as the general gap behaviour in the underdoped regime. The other, which dominates the near-nodal regime, does not increase with less doping and opens near Tc via a ... continued below

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Tanaka, K.; Lee, W.S.; Hussain, Zahid & Shen, Z.-X. March 6, 2008.

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This short paper summarizes the results we presented at the LEHTSC2007 conference. Recent doping and temperature dependence of angle-resolved photoemission data of underdoped superconducting cuprate Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} (Bi2212) have revealed the presence of two energy scales exhibiting distinct behaviours. One, which dominates the antinodal region, increases with underdoping and does not show obvious temperature dependence across Tc. This is a behaviour known for more than a decade and considered as the general gap behaviour in the underdoped regime. The other, which dominates the near-nodal regime, does not increase with less doping and opens near Tc via a BCS-like temperature dependence. This is a behaviour not previously observed in the single particle spectra. We propose a momentum space picture of these two energy scales or energy gaps that could resolve the seemingly contradictory gap measurements among different experimental techniques. Our results have also further constrained the theory for high-Tc superconducting cuprates.

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  • Journal Name: Journal of physics. Conference series (Online); Journal Volume: 108; Journal Issue: 1

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  • Report No.: LBNL-4760E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1088/1742-6596/108/1/012014 | External Link
  • Office of Scientific & Technical Information Report Number: 1032519
  • Archival Resource Key: ark:/67531/metadc833915

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  • March 6, 2008

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • July 28, 2016, 1:07 p.m.

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Tanaka, K.; Lee, W.S.; Hussain, Zahid & Shen, Z.-X. Direct Evidence of Two Gaps in Underdoped Bi2212, article, March 6, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc833915/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.