Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K in RBa2Cu3O7-delta (R=Y,Gd,Eu) Superconducting Crystals from Infrared Spectroscopy
Název česky | Supravodivé fluktuace při teplotách až 180 K v supravodivých krystalech RBa2Cu3O7-delta (R=Y,Gd, Eu} |
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Autoři | |
Rok publikování | 2011 |
Druh | Článek v odborném periodiku |
Časopis / Zdroj | Physical Review Letters |
Fakulta / Pracoviště MU | |
Citace | |
www | http://prl.aps.org/abstract/PRL/v106/i4/e047006 |
Doi | http://dx.doi.org/10.1103/PhysRevLett.106.047006 |
Obor | Fyzika pevných látek a magnetismus |
Klíčová slova | High-Tc superconductors; infrared response; precursor superconductivity above Tc |
Popis | We show that a miltilayer analysis of the infrared c-axis response of RBa2Cu3O7-delta (R=Y,Gd,Eu) provides important new information about the anomalous normal-state properties of underdoped curprate high temperature superconductors. In addition to competing correlations which give rise to a pseudogap that depletes the low-energy electronic states below T*>>Tc, it enables us to identify the onset of a precursor superconducting state below Tons>Tc. We map out the doping phase diagram of Tons which reaches a maximum of 180K at strong underdoping and present magnetic field dependent data which confirm our conclusions. |
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