Abstract
Pressure-dependent electrical resistivity and ac-calorimetrymeasurements on single crystals of the heavy-fermion antiferromagnetU2Zn17 at pressures to 5.5 GPa reveal that the low temperature magnetic order changes above ∼ 3 GPa. The Neéltemperature (TN = 9.7 K at ambient pressure) decreases slowly for pressures below3 GPa, but above this pressure a new magnetic state develops atTM≈8.7 K. This magnetic phase becomes more stable with pressure increase (dTM/dP = 1 K GPa − 1,TM = 10.5 K at 5.3 GPa). Theheavy-electron state in U2Zn17 is robust against pressure—the electronic specific heat coefficientγ≈0.4 J mol − 1 K − 2 is nearly pressure independent for both magnetic phases. Magnetic ac-susceptibilitymeasurements show that the pressure-induced state is not ferromagnetic.
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