, Stony Brook University/ Brookhaven National Laboratory
[Host: Despina Louca]
Oxygen hole-doping effects on a spin-chain system, Ca2+xY2-xCu5O10-d
(CaYCuO) are reported. CaYCuO is a good specimen to study the magnetic
properties of the CuO2 chain at the ground state because it has no complex
structure other than the chain and it has hole dopability up to the formal
copper valence number of +2.4. Specifically, we can dope holes into the CuO2
chain by substituting Ca2+ for Y3+ or by utilizing oxygen deficiency. After
a systematic study of the two methods to dope holes, we found that oxygen
doping makes a more critical change in magnetic ordering in the chain than the
replacement of Ca2+. Oxygen deficiency effects of the chain on the magnetic
properties were explained using a mean field theory. A new relation for the
effective hole doping was found as p = x-(2/3)d.
Condensed Matter Seminar
Thursday, December 10, 2009
Physics Building, Room 313
Note special time.
Note special room.
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