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

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Authors	DUBROKA Adam ROESSLE M. KIM K. W. MALIK V. K. MUNZAR Dominik BASOV D. N. SCHAFGANS A. A. MOON S. J. LIN C. T. HAUG D. HINKOV V. KEIMER B. WOLF Th. STOREY J. G. TALLON J. L. BERNHARD C.
Year of publication	2011
Type	Article in Periodical
Magazine / Source	Physical Review Letters
MU Faculty or unit	Faculty of Science
Citation
Web	http://prl.aps.org/abstract/PRL/v106/i4/e047006
Doi	http://dx.doi.org/10.1103/PhysRevLett.106.047006
Field	Solid matter physics and magnetism
Keywords	High-Tc superconductors; infrared response; precursor superconductivity above Tc
Description	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.
Related projects:	Physical and chemical properties of advanced materials and structures