Temperature dependence of the spectral weight in p- and n-type cuprates: A study of normal state partial gaps and electronic kinetic energy

Journal Article · Sat Jul 15 00:00:00 EDT 2006 · Annals of Physics (New York)

DOI:https://doi.org/10.1016/j.aop.2006.04.008· OSTI ID:20845954

Bontemps, N ^[1]; Lobo, R P.S.M. ^[1]; Santander-Syro, A F ^[2]; Zimmers, A ^[3]

---

1. Laboratoire de Physique du Solide (UPR5 CNRS), 10 rue Vauquelin, 75231 Paris cedex 05 (France)
2. Laboratoire de Physique des Solides Universite Paris-Sud, 91405 Orsay (France)
3. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742 (United States)

The optical conductivity of CuO{sub 2} (copper-oxygen) planes in p- and n-type cuprates thin films at various doping levels is deduced from highly accurate reflectivity data. The temperature dependence of the real part {sigma} {sub 1} ({omega}) of this optical conductivity and the corresponding spectral weight allow to track the opening of a partial gap in the normal state of n-type Pr{sub 2-x}Ce {sub x}CuO{sub 4} (PCCO) but not of p-type Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} (BSCCO) cuprates. This is a clear difference between these two families of cuprates, which we briefly discuss. In BSCCO, the change of the electronic kinetic energy E {sub kin}-deduced from the spectral weight-at the superconducting transition is found to cross over from a conventional BCS behavior (increase of E {sub kin} below T {sub c}) to an unconventional behavior (decrease of E {sub kin} below T {sub c}) as the free carrier density decreases. This behavior appears to be linked to the energy scale over which spectral weight is lost and goes into the superfluid condensate, hence may be related to Mott physics.

• OSTI ID: 20845954
• Journal Information: Annals of Physics (New York), Vol. 321, Issue 7; Other Information: DOI: 10.1016/j.aop.2006.04.008; PII: S0003-4916(06)00081-9; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-4916
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARRIER DENSITY
CERIUM COMPOUNDS
CONDENSATES
COPPER OXIDES
CUPRATES
KINETIC ENERGY
PRASEODYMIUM COMPOUNDS
REFLECTIVITY
SUPERCONDUCTIVITY
SUPERFLUIDITY
TEMPERATURE DEPENDENCE
THIN FILMS