Beamer: use sans-serif font for DOIs in list of references when using ISO960 biblatex style

Question

As before, I'm using beamer, biblatex and the ISO960 citation style (style=iso-authoryear). When a reference contains a DOI, the term ,,DOI`` itself is printed in small caps when using this style; in beamer, this uses a serif font that clashes with the default sans-serif font, and I would like to address this.

Here is an MWE:

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8
%!TEX spellcheck = en_US
\documentclass{beamer}
\usepackage[style=iso-authoryear]{biblatex}
\usepackage{filecontents}
\begin{filecontents}{beamer-references-test.bib}
@Article{Hines2010,
  author    = {James R. Hines},
  journal   = {Journal of Economic Perspectives},
  title     = {Treasure {Islands}},
  year      = {2010},
  month     = nov,
  number    = {4},
  pages     = {103--126},
  volume    = {24},
  doi       = {10.1257/jep.24.4.103},
  publisher = {American Economic Association},
}
\end{filecontents}
\addbibresource{beamer-references-test.bib}
\usepackage{hyperref}
\usetheme{Madrid}
\setbeamertemplate{navigation symbols}{}
\begin{document}
    \begin{frame}[allowframebreaks]
        \frametitle{References}
        \nocite{*}
        \printbibliography
    \end{frame}
\end{document}

This produces:

Is there a suitable sans-serif small-caps font, and if so, how do I ensure it gets used here?

Alternatively: I'm not too hung up on the use of small caps as such. Is there a way to use regular capital letters for the term ,,DOI`` instead?

Answer 1

You could redefine the \mkbibacro macro to use a smaller font size instead of small caps:

\documentclass{beamer}
\usepackage[style=iso-authoryear]{biblatex}
\begin{filecontents}{beamer-references-test.bib}
@Article{Hines2010,
  author    = {James R. Hines},
  journal   = {Journal of Economic Perspectives},
  title     = {Treasure {Islands}},
  year      = {2010},
  month     = nov,
  number    = {4},
  pages     = {103--126},
  volume    = {24},
  doi       = {10.1257/jep.24.4.103},
  publisher = {American Economic Association},
}
\end{filecontents}
\addbibresource{beamer-references-test.bib}
\usetheme{Madrid}
\setbeamertemplate{navigation symbols}{}
\makeatletter
\renewcommand*{\mkbibacro}[1]{%
  {\scriptsize\MakeUppercase{#1}}
}
\makeatother
\begin{document}
    \begin{frame}[allowframebreaks]
        \frametitle{References}
        \nocite{*}
        \printbibliography
    \end{frame}
\end{document}

Or you could use a font which does have sans serif small caps:

\documentclass{beamer}
\usepackage[style=iso-authoryear]{biblatex}
\begin{filecontents}{beamer-references-test.bib}
@Article{Hines2010,
  author    = {James R. Hines},
  journal   = {Journal of Economic Perspectives},
  title     = {Treasure {Islands}},
  year      = {2010},
  month     = nov,
  number    = {4},
  pages     = {103--126},
  volume    = {24},
  doi       = {10.1257/jep.24.4.103},
  publisher = {American Economic Association},
}
\end{filecontents}
\addbibresource{beamer-references-test.bib}
\usetheme{Madrid}
\setbeamertemplate{navigation symbols}{}
\usepackage[sfmath]{kpfonts}
\begin{document}
    \begin{frame}[allowframebreaks]
        \frametitle{References}
        \nocite{*}
        \printbibliography
    \end{frame}
\end{document}