Muon-spin rotation study of magnetism in NaxCoO2 single crystals with 0.78  x  0.97

C. Bernhard; Ch. Niedermayer; A. Drew; G. Khaliullin; S. Bayrakci; J. Strempfer; R. K. Kremer; D. P. Chen; C. T. Lin; B. Keimer

doi:10.1209/0295-5075/80/27005

All issues

Volume 80 / No 2 (October 2007)

EPL, 80 2 (2007) 27005

Abstract

Issue		EPL Volume 80, Number 2, October 2007


Article Number		27005
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/80/27005
Published online		20 September 2007

EPL, 80 (2007) 27005

Muon-spin rotation study of magnetism in Na_xCoO₂ single crystals with 0.78 $\leqslant$ x $\leqslant$ 0.97

C. Bernhard¹^,2, Ch. Niedermayer³, A. Drew¹, G. Khaliullin², S. Bayrakci², J. Strempfer², R. K. Kremer², D. P. Chen², C. T. Lin² and B. Keimer²

¹ University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials (FriMat) Chemin du Musee 3, CH-1700 Fribourg, Switzerland
² Max-Planck-Institute for Solid State Research - Heisenbergstrasse 1, D-70569 Stuttgart, Germany
³ Paul-Scherrer-Institut - CH-5232 Villigen PSI, Switzerland

Received: 19 July 2007
Accepted: 1 September 2007

Abstract

By muon spin rotation we investigated the magnetic properties of a series of highly Na-doped Na_xCoO₂ single crystals with 0.78(1) $\leqslant$ x $\leqslant$ 0.97(1). Our data provide evidence for an intrinsically inhomogeneous magnetic state which can be described in terms of hole-doping (Na vacancy)-induced magnetic clusters that percolate at $1-x$ ≳ 0.04 until they yield a bulk magnetic state near $x~=~0.78$ . Evidence for a strong (likely geometrical) frustration of the magnetic order is obtained from the anomalous doping dependence of the spin fluctuation rate (above the ordering temperature) which is strongly enhanced at as compared to $x~=~0.97$ .

PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 76.75.+i – Muon spin rotation and relaxation

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.