Quantum Phase Transitions in the Itinerant Ferromagnet ZrZn${}_2$

Abstract

We report a study of the ferromagnetism of ZrZn${}_2$, the most promising material to exhibit ferromagnetic quantum criticality, at low temperatures $T$ as function of pressure $p$. We find that the ordered ferromagnetic moment disappears discontinuously at $p_c$=16.5 kbar. Thus a tricritical point separates a line of first order ferromagnetic transitions from second order (continuous) transitions at higher temperature. We also identify two lines of transitions of the magnetisation isotherms up to 12 T in the $p-T$ plane where the derivative of the magnetization changes rapidly. These quantum phase transitions (QPT) establish a high sensitivity to local minima in the free energy in ZrZn${}_2$, thus strongly suggesting that QPT in itinerant ferromagnets are always first order.

References in corpus (8)

• First order transitions and multicritical points in weak itinerant ferromagnets
• Pressure dependence of the magnetization in the ferromagnetic superconductor UGe_2
• Ferromagnetic superconductivity driven by changing Fermi surface topology
• Multiple first-order metamagnetic transitions and quantum oscillations in ultrapure
• Competition of Spin-Fluctuations and Phonons in Superconductivity of ZrZn2
• Longitudinal spin-fluctuations and superconductivity in ferromagnetic ZrZn${}_2$ from ab initio calculations
• Fluctuation-Driven Quantum Phase Transitions in Clean Itinerant Ferromagnets
• Heavy quasiparticles in the ferromagnetic superconductor ZrZn2

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