Pairing and the phase diagram of the normal coherence length ξN(T, x) above Tc of La(2-x)Sr(x)CuO4 thin films probed by the Josephson effect
| Autor: | T. Kirzhner, Gad Koren |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Superconductivity
Physics Josephson effect Multidisciplinary Condensed matter physics Condensed Matter - Superconductivity Conductance Article Coherence length Mathematics::Probability Pairing Condensed Matter::Superconductivity Condensed Matter::Strongly Correlated Electrons Cuprate Pseudogap Phase diagram |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Critical currents $I_c$ were measured in Superconducting - normal - superconducting SNS c-axis junctions, where S was optimally doped $YBa_2Cu_3O_{7-\delta}$ below $T_c$ (90 K) and N was $La_{2-x}Sr_xCuO_4$ above its $T_c$ ($\xi_N(x=0.18)]$. This unexpected result where junctions with lower carrier density in the barrier have higher conductance, is attributed to the presence of pre-formed pairs in the pseudogap regime of the cuprate barrier. Our data yields a new phase diagram of $\xi_N(T,x)$ whose contours of constant $\xi_N$ follow the trend of the superconducting dome of $La_{2-x}Sr_xCuO_4$ above its $T_c$, with $\xi_N$ enhancement in the underdoped regime above 55 K. Comment: Tal Kirzhner passed away on October 3 2013 in Haifa, at the young age of 29, from lung cancer. This study was supposed to be the main part of his PhD thesis. In this revised version, a supplementary part is included, and a correction to the x=0.24 doping level data of Fig. 5 is made (see details in the supplementary) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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