Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$]

Details Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$] Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$]

2003-08-05

arxiv.org/abs/cond-mat/0308066v1

Physical Review B 68, 134423 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 8 figures. to be appeared in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.68.134423

A positive muon spin rotation and relaxation ($\mu^+$SR) experiment on [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$], ({\sl i.e.}, Ca$_3$Co$_4$O$_9$, a layered thermoelectric cobaltite) indicates the existence of two magnetic transitions at $\sim$ 100 K and 400 - 600 K; the former is a transition from a paramagnetic state to an incommensurate ({\sf IC}) spin density wave ({\sf SDW}) state. The anisotropic behavior of zero-field $\mu^+$SR spectra at 5 K suggests that the {\sf IC-SDW} propagates in the $a$-$b$ plane, with oscillating moments directed along the c-axis; also the {\sf IC-SDW} is found to exist not in the [Ca$_2$CoO$_3$] subsystem but in the [CoO$_2$] subsystem. In addition, it is found that the long-range {\sf IC-SDW} order completes below $\sim$ 30 K, whereas the short-range order appears below 100 K. The latter transition is interpreted as a gradual change in the spin state of Co ions %% at temperatures above 400 K. These two magnetic transitions detected by $\mu^+$SR are found to correlate closely with the transport properties of [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$].

Affiliated with

Also associated with

No associations

Rating

Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$] does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$], we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hidden magnetic transitions in thermoelectric layered cobaltite, [Ca$_2$CoO$_3$]$_{0.62}$[CoO$_2$] will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-571545