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Growing and Patterning Thin Films of Pr 2 –x Ce x CuO 4-Y

Growing and Patterning Thin Films of Pr 2 –x Ce x CuO 4-Y. Justin Sousa Marco Salvaggio Matthew C. Sullivan. Department of Physics, Ithaca College, Ithaca NY. Superconductivity: What is it?.

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Growing and Patterning Thin Films of Pr 2 –x Ce x CuO 4-Y

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  1. Growing and Patterning Thin Films of Pr2 –xCexCuO4-Y Justin Sousa Marco Salvaggio Matthew C. Sullivan Department of Physics, Ithaca College, Ithaca NY

  2. Superconductivity: What is it? • Superconductivity is the ability of certain materials to conduct electric currents with zero resistance. • Discovered in 1911 by Heike Kamerlingh Onnes, Mercury: Tc = 4.2K • 1987: “High Temperature” Superconductivity, YBCO: Tc = 90K • Current High Tc is 138 K, Hg0.8Tl0.2Ba2Ca2Cu3O8.33 Meissner Effect

  3. Why Thin Films? • Advantages • Easy to grow within range of 1000 Å ≤ T ≤ 5000 Å • Easy to get uniform currents • Much harder to make measurements on crystals PCCO ≈ 3000 Å Substrate: 0.5 mm = 500 μm

  4. Film Growth Vacuum Chamber PCCO Plume Pulsed Laser Deposition Substrate • KrF Laser: λ= 248 nm • Chamber filled with N20 • Substrate is 5x5 mm of STO • Heater Temp = 850o C • Film Characterization • AC Susceptibility • X-Ray Diffraction Heater Check out our video at www.ithaca.edu/physics

  5. Sample Preperation Ready For Measurements Patterned Film PCCO V- I + I - V +

  6. Patterning Photoresist PCCO Substrate Gold Chrome Indium Solder To Computer

  7. Measurements at the Ithaca College Low Temperature Physics Lab

  8. Characteristics of PCCO • Pr2-xCexCuO4-y, x indicates the cerium concentration • Optimal Doping is x = 0.15 with Tc = 20 K • We have studied the range of 0.13 ≤x≤ 0.19

  9. IV Data for Optimally Doped PCCO Critical Isotherm T = 21.60 K V = KIa becomes: log(V) = a log(I) where a is the slope. Ohmic behavior implies a = 1, K = R or V = IR

  10. Future Work • Continue to look for the critical exponent in films of different dopings • Measure critical current and critical field in PCCO and YBCO Thanks to • Dr. Matthew C Sullivan • The Ithaca College Dana Internship Committee • The Center for Superconductivity Research at The University of Maryland

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