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The heavy fermion compound Ce$_{3}$Pd$_{20}$Si$_{6}$ displays unconventionalquantum criticality as the lower of two consecutive phase transitions is fullysuppressed by magnetic field. Here we report on the effects of pressure asadditional tuning parameter. Specific heat and electrical resistivitymeasurements reveal a converse effect of pressure on the two transitions,leading to the merging of both transitions at 6.2 kbar. The field-inducedquantum criticality is robust under pressure tuning. We rationalize ourfindings within an extended version of the global phase diagram forantiferromagnetic heavy fermion quantum criticality.

Converse effect of pressure on quadrupolar and magnetic transition in Ce$_{3}$Pd$_{20}$Si$_{6}$