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26th National Symposium on Cryogenics and Superconductivity

22-24 February 2017
VECC
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Oscillation of Tc in Pr0.5Ca0.5MnO3/YBa2Cu3O7-δ Multilayer
 
Content: Thin film of YBa2Cu3O7-δ (YBCO) with thickness of ~ 60nm has been deposited on (100) oriented SrTiO3 substrate by Pulsed Laser Deposition technique. A half portion of the base YBCO layer was masked insitu using mechanical shadow mask. In the remaining half portion, five alternate layers of Pr0.5Ca0.5MnO3 (PCMO) thin film and YBCO thin film were deposited. Thickness of these individual layers were maintained at ~60 nm. KrF excimer laser (wave length: 248nm) with fluence of ~1.5 J/cm2 and pulse repetition rate of 2Hz was used for the deposition of the multilayer film. XRD measurement confirms the formation of the YBCO and PCMO thin films. A four terminal injection geometry has been used for non-equilibrium quasiparticle distribution in the multilayer. Magnetoresistance measurements were carried out under externally applied magnetic field varied from 0T to 15T. In addition an injection current of 200 µA was applied and the variation in transition temperature (Tc) was measured at different externally applied magnetic field. A noticeable damped oscillation of the superconducting transition temperature (TC) of this multilayer with respect to magnetic field was observed. The possible reason for this damped oscillatory behavior of the TC is the different coupling mechanism between the electrons of the FM phases of PCMO and superconducting YBCO. Further studies are being done to identify the cause of damped oscillatory behavior of Tc.
Id: 26
Place: VECC 
1/AF, Bidhan Nagar Kolkata - 700008

Room: Hall B (Annex Auditorium)
Starting date:
24-Feb-2017   14:45 (Asia/Kolkata)
Duration: 15'
Contribution type: Contributory Talk
Primary Authors: Dr. BAISNAB, Dipak Kumar (Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India)
Co-Authors: Dr. VAIDHYANATHAN, L. S. (Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India)
Mr. BASKARAN, R (Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India)
Presenters: Dr. BAISNAB, Dipak Kumar
 
Included in session: Technical Session 13
Included in track: Superconducting Materials / Low Temperature Physics