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APS » Journals » Phys. Rev. B » Volume 76 » Issue 17
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Phys. Rev. B 76, 172507 (2007) [4 pages]

In-plane copper-oxygen bond-stretching mode anomaly in underdoped La2−xSrxCuO4+δ measured with high-resolution inelastic x-ray scattering

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Jeff Graf
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Matteo d’Astuto*, Paola Giura, and Abhay Shukla
Institut de Minéralogie et de Physique des Milieux Condensés (IMPMC), Université Pierre et Marie Curie-Paris 6, case 115, 4, place Jussieu, 75252 Paris Cedex 05, France†

Naurang L. Saini
Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy

Alexei Bossak and Michael Krisch
European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France

Sang-Wook Cheong
Rutgers Center for Emergent Materials and Department of Physics & Astronomy, Rutgers, Piscataway, New Jersey 08854, USA

Takao Sasagawa
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 7-3-1 Hongo-Bunkyo, Japan

Alessandra Lanzara
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physics, University of California Berkeley, California 94720, USA

Received 25 July 2007; published 27 November 2007

We have measured the lattice dynamics of underdoped La2−xSrxCuO4+δ (x=0.08) using high resolution inelastic x-ray scattering spectroscopy. The very good intrinsic Q resolution of this experiment allows us to differentiate between the two proposed scenarios for the Cu-O bond stretching phonon broadening reported at q=(0.25,0,0). The results suggest that this phonon broadening is due to intrinsic damping rather than to a steep dispersion, having important implications on the interpretation of phonon anomalies in cuprates.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.172507
DOI:
10.1103/PhysRevB.76.172507
PACS:
74.72.Dn, 63.20.Kr, 63.20.Dj, 74.25.Kc

*matteo.dastuto@impmc.jussieu.fr

†Institut de Minéralogie et de Physique des Milieux Condensés (IMPMC), CNRS UMR 7590, Campus Bouciaut, 140 rue de Lourmel, 75015 Paris, France.

 
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