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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 3 Issue 2 (1998) pp 163-167
New slow and short range magnetic correlations in superconducting $\mathsf{La_{ 2-{ x}}Sr_{ x}CuO_4}$
S. Petit (a), A.H. Moudden, B. Hennion, A. Vietkin, A. Revcolevschi
Laboratoire Léon Brillouin, CE-SACLAY, 91191 Gif-sur-Yvette, France and Laboratoire de Chimie des solides (URA 446 CNRS), Université Paris-Sud, Orsay, France
Received: 3 September 1997 / Revised: 21 November 1997 / Accepted: 26 January 1998
Abstract: Inelastic neutron scattering measurements have been performed on high quality single crystals of $\rm La_{ 2-{\it x}}Sr_{\it x}CuO_4$ in order to study the spin dynamics of this compound. In addition to the well-established incommensurate magnetic response, we show the existence of a new set of low energy excitations present in the whole superconducting region of the phase diagram. This new feature of the dynamical cross section is characterized, below about 10 K, by very short range ($\sim 3$ lattice spacing) antiferromagnetic correlations and by a low energy scale of $\sim 1$ meV. At higher temperatures these fluctuations become nearly Q-independent. Different possible origins of these new spin correlations are discussed.
PACS. 74.25.Ha Magnetic properties - 74.72.Dn La-based cuprates - 78.70.Nx Neutron inelastic scattering
(a) email: spetit@bali.saclay.cea.fr
Article in PDF-Format (409 KB)
Online publication: July 9, 1998
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