One- and two-triplon spectra of a cuprate ladder

S. Notbohm, P. Ribeiro, B. Lake, D. A. Tennant, K. P. Schmidt, G. S. Uhrig, C. Hess, R. Klingeler, G. Behr, B. Buechner, M. Reehuis, R. I. Bewley, C. D. Frost, P. Manuel, R. S. Eccleston

Research output: Contribution to journalArticlepeer-review

86 Citations (Scopus)

Abstract

We have performed inelastic neutron scattering on the near ideal spin-ladder compound La4Sr10Cu24O41 as a starting point for investigating doped ladders and their tendency toward superconductivity. A key feature was the separation of one-triplon and two-triplon scattering. Two-triplon scattering is observed quantitatively for the first time and so access is realized to the important strong magnetic quantum fluctuations. The spin gap is found to be 26.4 +/- 0.3 meV. The data are successfully modeled using the continuous unitary transformation method, and the exchange constants are determined by fitting to be J(leg) = 186 meV and J(rung) = 124 meV along the leg and rung, respectively; a substantial cyclic exchange of J(cyc) = 31 meV is confirmed.

Original languageEnglish
Number of pages4
JournalPhysical Review Letters
Volume98
DOIs
Publication statusPublished - 12 Jan 2007

Keywords

  • MAGNETIC EXCITATIONS
  • 2-LEG LADDERS
  • SPIN GAPS
  • SUPERCONDUCTIVITY

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