Pressure dependence of the magnetization of URu2Si2

Abstract

The ground state of URu2Si2 changes from so-called hidden order (HO) to large-moment antiferromagnetism (LMAF) upon applying hydrostatic pressure in excess of 14 kbar. We report the dc-magnetization M(B,T,p) of URu2Si2 for magnetic fields B up to 12 T, temperatures T in the range 2 to 100 K, and pressure p up to 17 kbar. Remarkably, characteristic scales such as the coherence temperature T*, the transition temperature T0, and the anisotropy in the magnetization depend only weakly on the applied pressure. However, the discontinuity in dM/dT at T0, which measures the magnetocaloric effect, decreases nearly 50 % upon applying 17 kbar for M and B parallel to the tetragonal c-axis, while it increases 15-fold for the a-axis. Our findings suggest that the HO and LMAF phases have an astonishing degree of similarity in their physical properties, but a key difference is the magnetocaloric effect near T0 in the basal plane.

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• Competing Ordered Phases in URu2Si2: Hydrostatic Pressure and Re-substitution
• Complex Landau Ginzburg Theory of the Hidden Order in URu_2Si_2
• Field-induced spin-density wave beyond hidden order in URu2Si2
• Analogy between the "Hidden Order" and the Orbital Antiferromagnetism in URu${}_{2-x}$Fe${}_x$Si${}_2$
• Antiferromagnetism and Hidden Order in Isoelectronic Doping of URu${}_2$Si${}_2$
• Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu${}_2$Si${}_2$
• Hydrostaticity and hidden order: effects of experimental conditions on the temperature-pressure phase diagram of URu2Si2
• 29Si nuclear magnetic resonance study of URu2Si2 under pressure
• Collinear antiferromagnetic order in URu${}_2$Si${}_{2-x}$P${}_x$ revealed by neutron diffraction