Abstract
Magnetic susceptibility and zero-field muon spectroscopy measurements of monoclinic are reported. The magnetic susceptibility shows a broad maximum at around 12 K with no divergence between the zero-field cooled and field-cooled susceptibility, implying low-dimensional antiferromagnetic ordering. Application of the Bonner-Fischer model, applicable for a uniform linear Heisenberg chain, gives an exchange energy of and substantially reduced In this magnetically dilute system, the observation of an oscillating signal in the experiments is a clear and unambiguous signature of static magnetic correlations. We argue that this is due to an incommensurate arrangement of the electronic moments, similar to a spin-density wave. This phase sets in below and produces spontaneous muon-spin precession associated with two distinct internal local fields that saturate at 39.3(6) and 138(1) G at 60 mK.
- Received 23 August 2001
DOI:https://doi.org/10.1103/PhysRevB.65.134405
©2002 American Physical Society