2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Theory/experiments of X-Ray flux effect on periodic lattice distortions in YBCO

H.S. Sahibudeen, M.A. Navacerrada and J.V. Acrivos
San Jose' State University, US

synchrotron XRD, periodic lattice distortions, nano films

The dynamics for the effect of X-ray flux on periodic lattice distortion waves in YBCO (YBa2Cu3O7-d) 50nm films on STO *SrTiO3) is described: The X-ray flux r(t)=photons/s can induce many possible resonant excitations between states, n,l when hv-Sum(En-El)=>0. Here hv(n,l)+YBCO=>X¹ indicates a path for: YBCO7(metal)=X¹=YBCO6.5(insulator) transition. The YBCO mole fraction, y(YBCO) at r(t) is varied by Al filters f t mil thick, and obeys the relation: 1/y(YBCO) = 1 + r(t) T1 where T1 is the X¹ lifetime and 1/T1 is of the order r(0) ~ 10 giga photons/s achieved in synchrotrons.

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