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APS » Journals » Phys. Rev. B » Volume 69 » Issue 17
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Phys. Rev. B 69, 174507 (2004) [7 pages]

Evidence for an incommensurate magnetic resonance in La2-xSrxCuO4

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J. M. Tranquada1, C. H. Lee2, K. Yamada3, Y. S. Lee4, L. P. Regnault5, and H. M. Rønnow5
1Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
3Institute for Chemical Research, Kyoto University, Gokashou, Uji, 611-0011 Kyoto, Japan
4Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
5CEA/Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, 38054 Grenoble cedex 9, France

Received 9 October 2003; published 28 May 2004

We study the effect of a magnetic field (applied along the c axis) on the low-energy, incommensurate magnetic fluctuations in superconducting La1.82Sr0.18CuO4. The incommensurate peaks at 9 meV, which in zero field were previously shown to sharpen in q on cooling below Tc [T. E. Mason et al., Phys. Rev. Lett. 77, 1604 (1996)], are found to broaden in q when a field of 10 T is applied. The applied field also causes scattered intensity to shift into the spin gap. We point out that the response at 9 meV, though occurring at incommensurate wave vectors, is comparable to the commensurate magnetic resonance observed at higher energies in other cuprate superconductors.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.174507
DOI:
10.1103/PhysRevB.69.174507
PACS:
74.72.Dn, 78.70.Nx, 74.25.Nf
 
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