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Phys. Rev. Lett. 98, 247003 (2007) [4 pages]

Disappearance of Antiferromagnetic Spin Excitations in Overdoped La2-xSrxCuO4

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S. Wakimoto1, K. Yamada2, J. M. Tranquada3, C. D. Frost4, R. J. Birgeneau5, and H. Zhang6
1Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
2Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan
3Brookhaven National Laboratory, Upton, New York 11973-5000, USA
4ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom
5Department of Physics, University of California, Berkeley, Berkeley, California 94720, USA
6Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7

Received 6 September 2006; published 11 June 2007

Magnetic excitations for energies up to ∼100  meV are studied for overdoped La2-xSrxCuO4 with x=0.25 and 0.30, using time-of-flight neutron spectroscopy. Comparison of spectra integrated over the width of an antiferromagnetic Brillouin zone demonstrates that the magnetic scattering at intermediate energies, 20≲ω≲100  meV, progressively decreases with overdoping. This strongly suggests that the magnetism is not related to Fermi surface nesting, but rather is associated with a decreasing volume fraction of (probably fluctuating) antiferromagnetic bubbles.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.247003
DOI:
10.1103/PhysRevLett.98.247003
PACS:
74.72.Dn, 61.12.Ex, 75.40.Gb
 
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