Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K 
in RBa2Cu3O7-δ (R = Y, Gd, Eu) Superconducting Crystals from Infrared 
Spectroscopy

Dubroka, A.; Rössle, M.; Kim, K. W.; Malik, V. K.; Munzar, D.; Basov, D. N.; Schafgans, A. A.; Moon, S. J.; Lin, C. T.; Haug, D.; Hinkov, V.; Keimer, B.; Wolf, T.; Storey, J. G.; Tallon, J. L.; Bernhard, C.

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Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K in RBa₂Cu₃O_7-δ (R = Y, Gd, Eu) Superconducting Crystals from Infrared Spectroscopy

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Lin, C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Haug, D.
Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society;

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Hinkov, V.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Keimer, B.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Bernhard, C.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Dubroka, A., Rössle, M., Kim, K. W., Malik, V. K., Munzar, D., Basov, D. N., et al. (2011). Evidence of a Precursor Superconducting Phase at Temperatures as High as 180 K in RBa₂Cu₃O_7-δ (R = Y, Gd, Eu) Superconducting Crystals from Infrared Spectroscopy. Physical Review Letters, 106(4): 047006.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C025-F

Abstract

We show that a multilayer analysis of the infrared c-axis response of RBa(2)Cu(3)O(7-delta) (R = Y, Gd, Eu) provides important new information about the anomalous normal-state properties of underdoped cuprate high temperature superconductors. In addition to competing correlations which give rise to a pseudogap that depletes the low-energy electronic states below T* >> T(c), it enables us to identify the onset of a precursor superconducting state below T(ons) > T(c). We map out the doping phase diagram of T(ons) which reaches a maximum of 180 K at strong underdoping and present magnetic field dependent data which confirm our conclusions.