Magnetic ordering in the charge-ordered Nb12O29

Alexandros Lappas, Joanna E. Waldron, Mark A. Green, Kosmas Prassides

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Magnetic susceptibility and zero-field muon spectroscopy (ZF-μ+SR) measurements of monoclinic Nb12O29 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 S = 1/2 linear Heisenberg chain, gives an exchange energy of J/k = 12.71 K and substantially reduced g=0.556. In this magnetically dilute system, the observation of an oscillating signal in the ZF-μ+SR experiments is a clear and unambiguous signature of static magnetic correlations. We argue that this is due to an incommensurate arrangement of the Nb4+ electronic moments, similar to a spin-density wave. This phase sets in below Tf≈10 K 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.

Original languageEnglish
Article number134405
Pages (from-to)1344051-1344057
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number13
Publication statusPublished - 2002 Apr 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Magnetic ordering in the charge-ordered Nb<sub>12</sub>O<sub>29</sub>'. Together they form a unique fingerprint.

Cite this