  Single-turn coil (STC) technique is a convenient way to generate ultrahigh
magnetic fields of more than 100 T. During the field generation, the STC
explosively destructs outward due to the Maxwell stress and Joule heating.
Unfortunately, the STC does not work at its full potential because it has
already expanded when the maximum magnetic field is reached. Here, we propose
an easy way to delay the expansion and increase the maximum field by using a
mass-loaded STC. By loading clay on the STC, the field profile drastically
changes, and the maximum field increases by 4 %. This method offers an access
to higher magnetic fields for physical property measurements.
