NSF put together an NSF Science Nation video on our discovery of axis-dependent conduction polarity, and our use of the amazing NSF-PARADIM crystal growth facility at Johns Hopkins University to help us grow Re4Si7 crystals.
https://www.nsf.gov/news/mmg/mmg_disp.jsp?med_id=187313
The PARADIM user facility is an amazing, one of a kind user facility. We highly recommend it to all researchers interested in crystal and thin film growth.