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Chhowalla Group Research
Gold Nanoparticles (acquired by UltraSTEM)
hybrid perovskite single crystals
rubrene OFETs
Professor Shahab Shojaei-Zadeh publishes in Phys Rev Fluids
Fabris Group Research

Magnetic phase diagram of a spin-chain system Ca2+xY2-x Cu5O10- : oxygen hole-doping effects

Categories: Physics - Condensed Matter (PHYS-CM)
Speaker: Keeseong Park, Stony Brook University/ Brookhaven National Laboratory
Date & Time: October 30, 2009 (All day)
Location: Serin Physics 385

Oxygen hole-doping effects on a spin-chain system, Ca2+xY2-x Cu5O10- 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.

Host:  Sang-Wook Cheong

Advancing Nanotechnology - IAMDN New Microscopes


Rutgers new scanning transmission electron microscope and new helium ion microscope help researchers develop nanotechnology used to fight cancer, generate power, and create more powerful electronics. Watch the video to learn more.

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