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The Effect of Superconducting Current on the Magnetic Phase Transition in LSCO films

The Effect of Superconducting Current on the Magnetic Phase Transition in LSCO films. Meni Shay , menishay@braude.ac.il Ort Braude College, Israel and Physics Department, Technion, Israel. LEM group, PSI, Switzerland. Physics Department, Technion, Israel. Gerard Nieuwenhuys

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The Effect of Superconducting Current on the Magnetic Phase Transition in LSCO films

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  1. The Effect of Superconducting Current on the Magnetic Phase Transition in LSCO films Meni Shay, menishay@braude.ac.il Ort Braude College, Israel and Physics Department, Technion, Israel LEM group, PSI, Switzerland Physics Department, Technion, Israel Gerard Nieuwenhuys Elvezio Morenzoni Andreas Suter Thomas Prokscha Amit Keren Gad Koren Amit Kanigel Daniel Podolsky Phys. Rev. B 80, 144511 (2009) Theoretical and Experimental Magnetism Meeting 8-9 September, 2010

  2. SG Research Question Does the super-current impact the magnetic state?

  3. A Picture Without a Model

  4. Works along this line Katano, S., Sato, M., Yamada, K., Suzuki, T., Fukase, T. “Enhancement of static antiferromagnetic correlations by magnetic field in a superconductor La2-xSrxCuO4 with x=0.12”Phys. Rev. B 62, R14677-R14680 (2000). Lake B. et al. “Antiferromagnetic order induced by an applied magnetic field in a high-temperature superconductor” Nature 415, 299-302 (2000). D. Haug et al. “Magnetic-field-enhanced incommensurate magnetism in the underdoped high-temperature superconductor YBa2Cu3O6.45”, Phys. Rev. Lett. 103, 017001 (2009).

  5. Jc~105 A/cm2A thin wire is needed How to do it? • Take a s.c. wire • Hold it at a constant known temperature T<Tm • Flow high current through it ~ Jc • Measure its internal magnetic orderas a function of current Using muon spin rotation of Low energy muons (LEM)

  6. Sample 300μ A long (8m) and thin (0.5x100μm2) meander La1.94Sr0.06CuO4 wire 2” Samples are prepared in the Technion in Gad Koren’s Lab

  7. Temperature Calibration Temperature accuracy ~ 0.01 K

  8. Results – from Bulk samples (GPS)

  9. Results

  10. Results

  11. Interpretation & Analysis

  12. Ginzburg-Landau Model for two interacting order parameters with chemical potential Special Case: SO(5) Theory Demler et. al. Rev. Mod. Phys.76909 (2004).

  13. The GL params are known Theory Experiment Integrated over a unit cell

  14.  changes with Ithrough the interaction term Start from GL free energy Prediction The magnetic transition temperature, Tm, changes when current is applied Integrated over a unit cell

  15. Conclusions The temperature of the magnetic phase transition is increased by the flow of a strong superconducting current

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