Famine in the Republic of South Sudan

Publisher PD

A better future: teaching leadership in African schools

Publisher PD

Possible Microscopic Doping Mechanism in Tl-2201

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.Comment: 2 pages, 1 figure, submitted as conference proceedings for M2S-IX, Toky