Possible Microscopic Doping Mechanism in Tl-2201

Details Possible Microscopic Doping Mechanism in Tl-2201 Possible Microscopic Doping Mechanism in Tl-2201

2009-09-18

arxiv.org/abs/0909.3358v1

Physica C 470, S123-S124 (2010)

Physics

Condensed Matter

Superconductivity

2 pages, 1 figure, submitted as conference proceedings for M2S-IX, Tokyo

Scientific paper

10.1016/j.physc.2009.10.056

X-ray absorption spectroscopy on oxygen-annealed, self-flux-grown single crystals of Tl-2201 suggests a microscopic doping mechanism whereby interstitial oxygens are attracted to copper substituted on the thallium site, contributing holes to both the planes and to these coppers, and typically promoting only one hole to the plane rather than two. These copper substituents would provide an intrinsic hole doping. The evidence for this is discussed, along with an alternative interpretation.

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