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Disorder Tuned Superconductor Insulator Transition in La2?x (Sr/Ce) x CuO4 & NbN Superconducting Thin Films |
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| Authors: | J Vanacken G Zhang T Wambecq V V Moshchalkov B Leridon K Jin B R Zhao B Y Zhu P Raychaudhuri S P Chockalingam M Chand J Jesudasan |
| Affiliation: | 1. Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D, 3001, Leuven, Belgium 2. Laboratoire de Physique Quantique, UPR5–ESPCI, 10, rue Vauquelin, 75231, Paris cedex 05, France 3. National Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Zhong Guan Cun, P.O. Box 603, Beijing, 100080, P.R. China 4. Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai, 400005, India |
| Abstract: | In studying the magneto-resistivity ρ(B) in high pulsed magnetic fields up to 55 T, it is often observed that the ρ(B) curves for different temperatures in the vicinity of the critical temperature cross at the same field value, B=B CP . We show how the crossing field changes as a function of the hole (or electron) doping x in La2?x (Sr/Ce) x CuO4. The resistivity ρ and the magnetic field B at different temperatures may be scaled as R/R CP and |B?B CP|/T γ , respectively. This kind of scaling resulted in a conventional critical exponent γ=1/ν z=1.35 (ν z～0.74) in our La2?x (Sr/Ce) x CuO4 thin films, and a much higher value of γ=4.35 (ν z～0.23) in the case of our disordered NbN films. |
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