Using math-mode in pgfplots axis unit

Question

I want to apply a unit to my axis. Usually I use the siunitx package for that. However, this time I would like to use a Greek letter with a subscript \mu_\text{B} but my document won't compile.

Here is a MWE which compiles if you remove the $s.

\documentclass[]{scrartcl}

\usepackage[utf8]{inputenc}
\usepackage{mathtools}


\usepackage{pgfplots,tikz}
\pgfplotsset{compat=newest}
\usepgfplotslibrary{units}

\begin{document}

\begin{figure}[tbch]
    \centering
    \begin{tikzpicture}
        \begin{axis}[
            axis line style={very thick},
            axis lines = left,
            y unit ={$A$},
            unit marking pre={\text{in }}, 
            unit marking post={},
            ylabel = Yupp
        ]
        \end{axis}
    \end{tikzpicture}
    \end{figure}

\end{document}

Answer 1

Since all typesetting of labels occur within math mode, you don't need $ there. Just use

y unit =\mu_{\text{B}},

Here is the MWE

\documentclass[]{scrartcl}

\usepackage[utf8]{inputenc}
\usepackage{mathtools}


\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usepgfplotslibrary{units}

\begin{document}

\begin{figure}[tbch]
    \centering
    \begin{tikzpicture}
        \begin{axis}[
            axis line style={very thick},
            axis lines = left,
            y unit =\mu_{\text{B}},
            unit marking pre={\text{in }},
            unit marking post={},
            ylabel = Yupp
        ]
        \end{axis}
    \end{tikzpicture}
    \end{figure}

\end{document}