Oxygen hole-doping e ects on a spin-chain system, Ca 2+xY2-xCu 5O10-delta(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. Specically, we can dope holes into the CuO2 chain by substituting Ca 2+ for Y3+ or by utilizing oxygen deciency. 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 deciency 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 -- adelta, where a = 3/2( x -- delta) -- 1/4. We study the anisotropy of magnetic properties of single crystal Li-cathode material (LiFePO4) for g-factor, Curie-Weiss temperature, and effective moment. Magnetic properties Au/SiO2 coated gamma-Fe2O3 are compared with pure gamma-Fe2O3 finding a decrease in the blocking temperature and the irreversible temperature for the coated nanoparticles.See the manual), are mounted on a combustion boat by a special tool provided by the company. ... Temperature control can be done with the Eurotherm 818P temperature controller and with temperature profiles whose example for the heatinganbsp;...
|Title||:||Magnetic Phase Diagram of Calcium Yttrium Copper Oxide: Oxygen Hole-doping Effects|
|Publisher||:||ProQuest - 2007|