Energy Spectrum of Spin Fluctuations in Superconducting La2-xSrxCuO4 (0.10 < x < 0.25)

Details Energy Spectrum of Spin Fluctuations in Superconducting La2-xSrxCuO4 (0.10 < x < 0.25) Energy Spectrum of Spin Fluctuations in Superconducting La2-xSrxCuO4 (0.10 < x < 0.25)

1999-12-27

arxiv.org/abs/cond-mat/9912453v2

J. Phys. Soc. Jpn. 69 (2000) 1170

Physics

Condensed Matter

Superconductivity

15 pages, 8 figures, revtex

Scientific paper

10.1143/JPSJ.69.1170

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 ~8meV 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, x"(w), exhibits an enhancement around 7meV, 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 x"(w) 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 x"(w) below Tc.

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