Magnetic frustration in the disordered pyrochlore Yb sub(2)GaSbO sub(7)

In the pyrochlore Yb sub(2)GaSbO sub(7), theYb super(3+) sublattice forms a network of corner sharing tetrahedra and the second sublattice is made up of disordered, non-magnetic Ga super(3+) and Sb super(5+) ions. We have examined this compound using magnetic susceptibility, super(170)Yb Mossbauer s...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-01, Vol.23 (16), p.1-8
Main Authors: Hodges, J A, Dalmas de Reotier, P, Yaouanc, A, Gubbens, P C M, King, P J C, Baines, C
Format: Article
Language:English
Subjects:
Condensed matter
Correlation
Dynamics
Ferromagnetism
Fluctuation
Frustration
Networks
Pyrochlores
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In the pyrochlore Yb sub(2)GaSbO sub(7), theYb super(3+) sublattice forms a network of corner sharing tetrahedra and the second sublattice is made up of disordered, non-magnetic Ga super(3+) and Sb super(5+) ions. We have examined this compound using magnetic susceptibility, super(170)Yb Mossbauer spectroscopy (down to 0.03 K) and muon spin relaxation ( mu SR) (down to 0.02 K) measurements. We establish the size of the Yb super(3+) magnetic moments and that of the Yb super(3+)-Yb super(3+) coupling. At low temperatures, the correlated moments fluctuate between directions that are well tilted relative to the local [111] axis. The lattice disorder does not quench the frustration induced low temperature spin fluctuations but it does remove the first order dynamic transition that is present in the crystallographically ordered counterpart Yb sub(2)Ti sub(2)O sub(7). Below 1.0 K, the fluctuation rate of the correlated moments decreases progressively as the temperature is reduced and the moments remain dynamic down to 0.02K where the rate is 7 10 super(7) s super(-1). Magnetic frustration is operative in Yb sub(2)GaSbO sub(7) where the Yb super(3+)-Yb super(3+) interaction is antiferromagnetic as it is in Yb sub(2)Ti sub(2)O sub(7) where the interaction is ferromagnetic.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/16/164217