Energy spectrum of spin fluctuations in superconducting La2-xSrxCuO4 (0.10 ≤ x ≤ 0.25)

Chul Ho Lee, Kazuyoshi Yamada, Yasuo Endoh, Gen Shirane, R. J. Birgeneau, M. A. Kastner, M. Greven, Y. J. Kim

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Abstract

The energy spectrum of incommensurate spin fluctuations in superconducting Sr-doped La2CuO4 has been studied by inelastic neutron scattering experiments. An energy gap in the spin excitation spectrum is observed in the superconducting state of optimally doped (x = 0.15) and slightly overdoped (x = 0.18) samples. At temperatures well below Tc, the incommensurate peaks diminish rapidly in intensity with decreasing energy below ∼8 meV and merge into the background below ∼3.5meV for x = 0.15 and ∼4.5meV for x = 0.18. For both samples, the energy spectrum of the q-integrated spin susceptibility. χx″(ω), exhibits an enhancement around 7 meV, which is caused by a broadening in the momentum width of the incommensurate peaks. The gap-like structure in the energy spectrum and the enhancement of χ″(ω) survive at Tc. On the other hand, for both underdoped (x = 0.10) and heavily overdoped (x = 0.25) samples there is neither a clear energy gap nor an enhancement of χ″(ω) below Tc.

Original languageEnglish (US)
Pages (from-to)1170-1176
Number of pages7
JournalJournal of the Physical Society of Japan
Volume69
Issue number4
DOIs
StatePublished - Apr 2000

Keywords

  • High-T superconductor
  • LaSrCuO
  • Neutron scattering
  • Spin fluctuation

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