Author guidelines for publishing to IOP Publishing journals in LaTeX
From the IOP Publishing
Other (as stated in the work)
This is an example of the iopart document class, and contains details on how to prepare and submit your articles for publication in an IOP Publishing journal. Note that IOP Publishing journals do not require TeX submissions to use this document class, other templates can be used.
If you'd like to write an IOP Publishing article, you can use this example document as a template and change the main article text to suit - simply click the button to get started.
Alternatively you can also just upload the iopart.cls file available from IOPP (see https://publishingsupport.iopscience.iop.org/questions/latex-template/) to any document you've already created, and change the document class to iopart to convert it to the style of this template.