Abstract
The low-energy magnetic excitation spectrum of the Heisenberg antiferromagnetic S=1/2 chain system Sr2CuO3 with Ni and Ca impurities is studied by neutron spectroscopy. In all casesa defect-induced spectral pseudogap is observed and shown to scale proportionately to the number of scattering centers in the spin chains.
| Original language | English |
|---|---|
| Pages (from-to) | 13028-13037 |
| Number of pages | 10 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 60 |
| Issue number | 18 |
| DOIs | |
| State | Published - 1999 |
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