pgfplots: Label-Platzierung bei 'matrix plot'

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\documentclass{article}
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.13}
\begin{document}
\begin{tikzpicture}
\begin{axis}[enlargelimits=false,
xticklabel pos=right,   % x-Achse oben statt unten
xlabel = {k}, 
ylabel = {n},
every axis x label/.style={at={(ticklabel cs:0)},anchor=near ticklabel},
every axis y label/.style={at={(ticklabel cs:1)},anchor=near ticklabel},
% hide x axis, hide y axis,  % Achsen ausblenden
%x = 5mm, y =5mm,   % Maßstab
]
\addplot[
matrix plot,
%mark=*,%nodes near coords=\coordindex,
mesh/color input=explicit,
]
coordinates {
(1,1) [color=red]      (2,1) [color=blue]  (3,1) [color=yellow]
(1,2) [color=black] (2,2) [color=brown] (3,2) [color=magenta]
(1,3) [color=green] (2,3) [color=red]  (3,3) [color=white]
};
\node at (1,1) []{a/b};
\coordinate (lu) at (yticklabel* cs:1);
\end{axis}
\draw (lu) -- +(135:1);
\end{tikzpicture}
\end{document}
 
 
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