Ultrasound measurements establish a bulk thermodynamic phase boundary inside the superconducting state of UTe2 for H parallel to b at approximately 14 T, terminating at a tetracritical point near 13.5 T and 1.25 K.
( 4) is only of order 10 − 6, two orders of magnitude smaller than ∆ f /f , and is therefore neglected without affecting the anomaly positions
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Thermodynamic Identification of the Internal Superconducting Phase Boundary in UTe$_2$ for $H \parallel b$
Ultrasound measurements establish a bulk thermodynamic phase boundary inside the superconducting state of UTe2 for H parallel to b at approximately 14 T, terminating at a tetracritical point near 13.5 T and 1.25 K.