Cu-nuclear quadrupole resonance (NQR) measurements have been performed on single crystals Sr14-x Cax Cu24 O41 (Cax) with x = 0-11.5, in order to clarify the relation between the magnetic order around x = 11.5 and local environments at the Cu sites upon x. Cu-NQR frequency vQ for the ladders at 4.2 K increases linearly with increasing x, whereas vQ for the nonmagnetic Zhang-Rice (ZR) sites in the chains does not. Detailed site assignment of the spectra, which are different from those in the previous paper, is presented.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics