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Recently, much attention has been paid to search for Majorana fermions in solid-state systems. Among various proposals there is one based on radio-frequency superconducting quantum interference devices (rf-SQUIDs), in which the appearance of 4π-period energy-phase relations is regarded as smoking-gun evidence of Majorana fermion states. Here we report the observation of truncated 4π-period (i.e., 2π-period but fully skewed) oscillatory patterns of contact resistance on rf-SQUIDs constructed onarXiv:1503.00838v2 fatcat:grqyfmgrwfdbzipmidyddhmq3e