Table 1.

The lattice stabilization energy can be obtained from the electron-lattice coupling g and the elastic deformation K through a simple Landau free-energy expansion

k	θ	g	K	$F_{\mathrm{latt}}^{\mathrm{sat}}$
		(eV/Å)	(eV/Å2)	(meV/f.u.)
[001]	x2−y2	2.52	19.9	−10.0
[000]	xy	$\left(\begin{array}{c}\hfill 0.76\hfill \\ \hfill 0.92\hfill \end{array}\right)$	$\left(\begin{array}{cc}\hfill 9.5\hfill & \hfill 3.8\hfill \\ \hfill 3.8\hfill & \hfill 21.8\hfill \end{array}\right)$	−2.5
[000]	z2	$\left(\begin{array}{c}\hfill 1.93\hfill \\ \hfill 2.48\hfill \end{array}\right)$	$\left(\begin{array}{cc}\hfill 18.4\hfill & \hfill 13.1\hfill \\ \hfill 13.1\hfill & \hfill 21.1\hfill \end{array}\right)$	−9.6