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APS » Journals » Phys. Rev. Lett. » Volume 102 » Issue 15
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Phys. Rev. Lett. 102, 157001 (2009) [4 pages]

Charge Excitations in the Stripe-Ordered La5/3Sr1/3NiO4 and La2-x(Ba,Sr)xCuO4 Superconducting Compounds

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S. Wakimoto1,*, H. Kimura2, K. Ishii3, K. Ikeuchi3, T. Adachi4, M. Fujita5, K. Kakurai1, Y. Koike4, J. Mizuki3, Y. Noda2, K. Yamada5,6, A. H. Said7, and Yu. Shvyd’ko7
1Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
2Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
3Synchrotron Radiation Research Center, Japan Atomic Energy Agency, Hyogo 679-5148, Japan
4Department of Applied Physics, Tohoku University, Sendai 980-8579, Japan
5Institute for Materials Research, Tohoku University, Katahira, Sendai 980-8577, Japan
6Advanced Institute for Materials Research, Katahira, Sendai 980-8577, Japan
7Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

Received 19 June 2008; published 14 April 2009

Charge excitations in stripe-ordered 214 compounds La5/3Sr1/3NiO4 and 1/8-doped La2-x(Ba or Sr)xCuO4 are studied using resonant inelastic x-ray scattering in the hard x-ray regime. We observe ≃1  eV excitation with a momentum transfer corresponding to the charge stripe spatial period both for the diagonal (nickelate) and parallel (cuprates) stripes. They are interpreted as collective stripe excitations or anomalous softening of the charge excitonic modes of the in-gap states.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.157001
DOI:
10.1103/PhysRevLett.102.157001
PACS:
74.72.Dn, 74.25.Jb, 78.70.Ck

*Corresponding author:

wakimoto.shuichi@jaea.go.jp

 
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