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Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs

Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs. P.M. Grant , W.Y. Lee, A. Nazzal (IBM Almaden Research Center), M.E. López-Morales (IIM-UNAM). WC25.03: 14:24 24 March 1999. HTSC Phase Diagram. La 2-x Sr x CuO 4- Coherence Ellipsoid.  La • Cu

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Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs

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  1. Field Dependence of Diamagnetic Shielding Fraction with Carrier Concentration in HTSCs P.M. Grant, W.Y. Lee, A. Nazzal (IBM Almaden Research Center), M.E. López-Morales (IIM-UNAM) WC25.03: 14:24 24 March 1999

  2. HTSC Phase Diagram

  3. La2-xSrxCuO4-Coherence Ellipsoid  La • Cu O ab = 20 Å c = 6 Å

  4. T T Fermi LiquidSuperconductors 0   -1/4

  5. M vs. T,HY.Ba2Cu3O7-y • IBM ARC Group Data: 16 March, 1987 • MRS Proc, April, 1987

  6. R/R100 vs. T,H,xY1-x(Pr0.7Ca0.3)xBa2Cu3O7-y

  7. (’, ”)ac vs. T,H,xY1-x(Pr0.7Ca0.3)xBa2Cu3O7-y

  8. (’, ”)ac vs. T,H,xLa2-xSrxCuO4-

  9. ac vs. T,H,yY.Ba2Cu3O7-y • Kubo, et al., PRB 37, 7858 (1988){1987}. • Early H-Field Dependence on “Carrier Concentration.”

  10. Summary • In moderate magnetic fields, low-T shielding limit complete only for highest TC carrier concentrations (a universal HTSC constant?) • For small external magnetic fields, (T0) ~ -1/4 at all carrier concentrations

  11. Conclusions • Strong evidence for granular behavior, due to either spacial or electronic inhomogeneities, at all carrier concentrations other than optimum. • Has this been the historical “smoking gun” pointing to the existence of stripe arrays in HTSCs?

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