High-energy magnetic excitations in underdoped La1.90Sr0.10CuO4

Kentaro Sato, Masato Matsuura, Masaki Fujita, Ryoichi Kajimoto, Sungdae Ji, Kazuhiko Ikeuchi, Mitsutaka Nakamura, Yasuhiro Inamura, Masatoshi Arai, Masanori Enoki, Kazuyoshi Yamada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We measured the magnetic excitations in underdoped (UD) La1.90Sr0.10CuO4 by using inelastic neutron scattering over a wide energy range. We succeeded in observing the high-energy excitations up to ≃160 meV. Hour-glass-like magnetic excitation, which is commonly seen in the superconducting phase of cuprate oxides, was confirmed. The E cross (the energy where the dispersion is closest to the (1/2, 1/2) reciprocal position) of ∼40 meV follows a linear relation between E cross and the doped hole concentration in the UD region. From the dispersion of high-energy excitations above E cross, we successfully found an effective nearest neighbor interaction (J eff) of 102 ± 2 meV. This J eff is smaller than the nearest neighbor interaction J(=132 meV) in the parent compound La2CuO4, indicating a reduction of J eff by hole-doping.

Original languageEnglish
Pages (from-to)1836-1839
Number of pages4
JournalJournal of the Korean Physical Society
Volume62
Issue number12
DOIs
Publication statusPublished - 2013 Jul

Keywords

  • High-T superconductor
  • Inelastic neutron scattering
  • LaSrCuO
  • Magnetic excitation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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