Shifting of the magnetic-resonance peak to lower energy in the superconducting state of underdoped YBa2Cu3O(6.8)

P. Bourges; L. P. Regnault; Y. Sidis; J. Bossy; P. Burlet; C. Vettier; J. Y. Henry; M. Couach

doi:10.1209/epl/i1997-00244-6

All issues

Volume 38 / No 4 (May I 1997)

Europhys. Lett., 38 4 (1997) 313-318

Abstract

Issue		Europhys. Lett. Volume 38, Number 4, May I 1997


Page(s)		313 - 318
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1997-00244-6
Published online		01 September 2002

Europhys. Lett., 38 (4), pp. 313-318 (1997)

Shifting of the magnetic-resonance peak to lower energy in the superconducting state of underdoped YBa2Cu3O(6.8)

P. Bourges¹, L. P. Regnault², Y. Sidis¹, J. Bossy³, P. Burlet², C. Vettier⁴, J. Y. Henry² and M. Couach²

¹ Laboratoire Léon Brillouin, CEA-CNRS, CE Saclay - 91191 Gif sur Yvette, France
² CEA Grenoble, Département de Recherche Fondamentale sur la Matière Condensée 38054 Grenoble cedex 9, France
³ Institut Laue-Langevin, 156X - 38042 Grenoble cedex 9, France
⁴ European Synchrotron Research Facility - BP 220, 38043 Grenoble cedex, France

Received: 22 October 1996
Accepted: 20 March 1997

Abstract

Inelastic neutron scattering has been used to determine the dynamic spin fluctuations in an underdoped high-temperature superconductor $\rm YBCO _{6.8}$ single crystal. The magnetic resonance, that occurs around 40 meV in overdoped samples, is shifted to a lower energy, $E_{\rm r} = 34\,\rm meV$ . A constant ratio, $E_{\rm r}/ k_{\rm B} T_{\rm C}= 4.9 \pm 0.2$ , almost independent of the doping level, is found. According to numerous theoretical approaches, this finding supports the idea that the resonance energy is proportional (approximately twice) to the superconducting gap.

PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 25.40.Fq – Inelastic neutron scattering / 74.72.Bk – Y-based cuprates

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