Merge branch 'lebedeva2' of https://github.com/zbych127/lammps into collected-post-stable-patches

doc/src/pair_lebedeva.txt

@@ -0,0 +1,63 @@
+"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c
+
+:link(lws,http://lammps.sandia.gov)
+:link(ld,Manual.html)
+:link(lc,Commands_all.html)
+
+:line
+
+pair_style lebedeva command :h3
+
+[Syntax:]
+
+pair_style hybrid/overlay lebedeva cutoff :pre
+
+[Examples:]
+
+pair_style hybrid/overlay lebedeva 20.0
+pair_coeff * * none
+pair_coeff 1 2 lebedeva  CC.Lebedeva   C C :pre
+
+pair_style hybrid/overlay rebo lebedeva 14.0
+pair_coeff * * rebo                 CH.airebo  C C
+pair_coeff 1 2 lebedeva  CC.Lebedeva      C C :pre
+
+[Description:]
+
+The {lebedeva} style computes the Lebedeva interaction
+potential as described in "(Lebedeva et al.)"_#Leb01. An important simplification is made,
+which is to take all normals along the z-axis.
+
+:c,image(Eqs/pair_lebedeva.png)
+
+It is important to have a sufficiently large cutoff to ensure smooth forces.
+Energies are shifted so that they go continuously to zero at the cutoff assuming
+that the exponential part of {Vij} (first term) decays sufficiently fast.
+This shift is achieved by the last term in the equation for {Vij} above.
+
+The parameter file (e.g. CC.Lebedeva), is intended for use with metal
+"units"_units.html, with energies in meV. An additional parameter, {S},
+is available to facilitate scaling of energies.
+
+This potential must be used in combination with hybrid/overlay.
+Other interactions can be set to zero using pair_style {none}.
+
+[Restrictions:]
+
+This fix is part of the USER-MISC package.  It is only enabled if
+LAMMPS was built with that package.  See the "Build
+package"_Build_package.html doc page for more info.
+
+[Related commands:]
+
+"pair_coeff"_pair_coeff.html
+"pair_none"_pair_none.html
+"pair_style hybrid/overlay"_pair_hybrid.html
+
+[Default:] none
+
+:line
+
+:link(Leb01)
+[(Lebedeva et al.)] I. V. Lebedeva, A. A. Knizhnik, A. M. Popov, Y. E. Lozovik, B. V. Potapkin, Phys. Rev. B, 84, 245437 (2011)
+