Scaling analysis of the static and dynamic critical exponents in underdoped, overdoped, and optimally doped Pr2-xCexCuO4-y films

Article

关键词: YBA2CU3O7-DELTA SINGLE-CRYSTALS;    BA-CU-O;    CRITICAL FLUCTUATIONS;    PHASE-TRANSITIONS;    CRITICAL-BEHAVIOR;    THIN-FILMS;    CUPRATE SUPERCONDUCTORS;    PENETRATION DEPTH;    MAGNETIC-FIELDS;    3D XY;   

DOI  :  10.1103/PhysRevB.81.134502

来源: SCIE

【 摘 要 】

We report on current-voltage measurements of the zero-field normal-superconducting phase transition in thin films of Pr2-xCexCuO4-y as a function of doping. We find that the small size of the critical regime in these materials (approximate to 25 mK) gives rise to mean-field behavior at the phase transition with a static exponent of nu approximate to 0.5 for all dopings (in contrast to hole- doped YBa2Cu3O7-delta). We also find mean- field behavior in the dynamic exponent z. This indicates that Pr2-xCexCuO4-y behaves similarly to conventional superconductors in contrast to other cuprate superconductors. However, as the transition width in our samples decreases, the dynamic critical exponent approaches z=1.5, similar to the critical exponent found in hole-doped YBa2Cu3O7-delta.

【 授权许可】

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