Coupling between quasiparticles and a bosonic mode in the normal state of

Y. Gallais; M. Le Tacon; A. Sacuto; D. Colson

doi:10.1209/epl/i2005-10422-6

All issues

Volume 73 / No 4 (February 2006)

Europhys. Lett., 73 4 (2006) 594-600

Abstract

Issue		Europhys. Lett. Volume 73, Number 4, February 2006


Page(s)		594 - 600
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2005-10422-6
Published online		13 January 2006

Europhys. Lett., 73 (4), pp. 594-600 (2006)

Coupling between quasiparticles and a bosonic mode in the normal state of $\chem{HgBa_2CuO_{4+\delta}}$

Y. Gallais¹, M. Le Tacon²^,3, A. Sacuto²^,3 and D. Colson⁴

¹ Department of Physics, Columbia University - New York, NY 10027, USA
² Laboratoire Matériaux et Phénomènes Quantiques (UMR 7162 CNRS) Université Paris 7 - 2 place Jussieu, 75251 Paris, France
³ Laboratoire de Physique du Solide, ESPCI - 10 rue Vauquelin, 75231 Paris, France
⁴ Service de Physique de l'Etat Condensé, CEA-Saclay - 91191 Gif-sur-Yvette, France

Received: 14 October 2005
Accepted: 13 December 2005

Abstract

We report a doping-dependent study of the quasiparticles dynamics in $\chem{HgBa_2CuO_{4+\delta}}$ via Electronic Raman Scattering. A well-defined energy scale is found in the normal-state dynamics of the quasiparticles over a broad doping range. It is interpreted as evidence for coupling between the quasiparticles and a collective bosonic mode whose energy scale depends only weakly on doping. We contrast this behavior with that of the superconducting gap whose amplitude near the node continuously decreases towards the underdoped regime. We discuss the implications of our findings on the nature of the collective mode and argue that electron-phonon coupling is the most natural explanation.

PACS: 74.72.-h – Cuprate superconductors (high-T_c and insulating parent compounds) / 74.25.Gz – Optical properties / 74.72.Jt – Other cuprates, including Tl and Hg-based cuprates

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