http://www.iop.org/EJ/abstract/-alert=13763/0957-0233/19/12/129801

“The discovery of superconductivity in H2O-intercalated Na0.33Co2 has reopened investigations of the physical properties of NaxCoO2 compounds, which remained largely unexplored so far. In the simplest picture, the Co planes contain x nonmagnetic (S=0) Co3+ ions and 1-x (S=1/2) spins (Co4+ low-spin state). One of the surprises in the emerging phase diagram is thus the presence of magnetic order at rather low Co4+ concentrations x>0.75. The origin of this order and how it evolves with x are presently unknown or controversial. These questions are directly related to the electronic state of Co and to the microscopic organization within CoO2 layers.”
Phys. Rev. Lett. October 2005 (http://link.aps.org/abstract/PRL/v95/e186405)

“Although appreciable experimental and theoretical effort has been devoted in studying the superconductivity in H2O intercalated NaxCoO2 compound, the physical properties of NaxCoO2 remained, so far, largely unexplored. In the simplest picture Co-planes contain x non-magnetic S=0 Co3+ ions and 1−x S=1/2 spins Co4+ low spin state. What’s amazing in the NaxCoO2 phase diagram is the presence of magnetic order at rather low Co4+ concentrations x>0.75. The origin of this order and how it evolves with x are presently unknown or controversial. These questions are directly related to the electronic state of Co and to the microscopic organization within CoO2 layers.
Solid State Communications, March 2006 (http://dx.doi.org/10.1016/j.ssc.2006.01.024)

Same program used by the editor?

$diff fun1 fun2
1c1,2
materials due to the Pockels cells and polarizers can add high-order dispersion to an amplifier system, making the recompression more difficult for very short pulses. Nevertheless, regenerative amplifiers have also been used to
> generate pulses of 30 fs and shorter duration [36, 37].
3c4
A multipass preamplifier configuration (figure 6(b)) differs from the regenerative amplifier in that, as its name suggests, the beam passes through the gain medium multiple times without the use of a cavity. The particular geometry