Investigating the Relationship Between the Superconducting and Pseudogap States of the High-temperature Superconductor Bi-2201 Using Scanning Tunneling Microscopy

Released on by Michael Christopher Boyer
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  • Investigating the Relationship Between the Superconducting and Pseudogap States of the High-temperature Superconductor Bi-2201 Using Scanning Tunneling Microscopy Book Detail

  • Author : Michael Christopher Boyer
  • Release Date : 2008
  • Publisher :
  • Genre :
  • Pages : 104
  • ISBN 13 :
  • File Size : 85,85 MB
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Investigating the Relationship Between the Superconducting and Pseudogap States of the High-temperature Superconductor Bi-2201 Using Scanning Tunneling Microscopy by Michael Christopher Boyer PDF Summary

Book Description: (Cont.) The second study focuses on the evolution of native impurity states in overdoped Bi2Sr2CuO6+8 (Tc = 15 K) through Tc. We find that the impurity states persevere virtually unchanged with temperature, save for the effects of thermal broadening, indicating an interaction of impurities with the pseudogap state both above and below Tc. The existence of a satellite peak in the impurity spectrum below TC shows an interaction of impurities with the superconducting state. This study provides confirmation that the pseudogap state exists below Tc and coexists with superconductivity. Our final study is of the doping and temperature dependence of the electronic checkerboard pattern observed in underdoped and optimally doped Bi2Sr2CuO6+8. We find the pattern exists both above and below Tc, and, with the support of other experimental evidence, believe this pattern represents the ordering of the pseudogap state. Our doping-dependence measurements show a pattern with a wavelength periodicity which increases with doping, which is consistent with a charge-density-wave origin for the checkerboard ordering and hence the pseudogap state. Taken together our studies show that the superconducting and pseudogap states appear to be separate states that coexist at the same spatial locations below Tc. And, we find evidence for charge density waves as the likely origin for the pseudogap state.

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