Neutron scattering studies on URu2Si2

Abstract

This paper is aiming to review some of the neutron scattering studies performed on URu2Si2 in Grenoble. This compound has been studied for a quarter of century because of a so-called hidden order ground state visible by most of the bulk experiments but almost invisible by microscopic probes like neutrons, muons NMR or x-ray. We stress on some aspects that were not addressed previously. Firstly, the comparison of the cell parameters in the 1-2-2 systems seems to point that the magnetic properties of URu2Si2 are leading by an U4+ electronic state. Secondly, a compilation of the different studies of the tiny antiferromagnetic moment indicates that the tiny antiferromagnetic moment has a constant value which may indicate that it is not necessary extrinsic. We also present the last development on the magnetic form factor measurement in which the magnetic density rotates when entering in the hidden order state. To end, the thermal dependence of the two most intense magnetic excitation at Q0=(1,0,0) and Q1=(0.6,0,0) seems to indicate two different origins or processes for these excitations.

18 pages, 18 figures, published in Philosophical Magazine, 2014

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• Field-induced spin-density wave beyond hidden order in URu2Si2
• Chemical pressure tuning of URu${}_2$Si${}_2$ via isoelectronic substitution of Ru with Fe
• Symmetry of the Excitations in the Hidden Order State of URu2Si2
• Antiferromagnetism and Hidden Order in Isoelectronic Doping of URu${}_2$Si${}_2$
• Distinct magnetic spectra in the hidden order and antiferromagnetic phases in URu2-xFexSi2
• Hidden Order Signatures in the Antiferromagnetic Phase of U(Ru${}_{1-x}$Fe${}_x$)${}_2$Si${}_2$
• Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu${}_2$Si${}_2$
• Gapped Excitations in the High-Pressure Antiferromagnetic Phase of URu${}_2$Si${}_2$
• Electrodynamics of the antiferromagnetic phase in URu${}_2$Si${}_2$
• Inelastic x-ray scattering measurements on URu2Si2
• Magnetic structure in U(Ru0.92Rh0.08)2Si2 single crystal studied by neutron diffraction in static magnetic fields up to 24 T
• Origin of gap-like behaviors in URu${}_2$Si${}_2$: Combined study via quasiparticle scattering spectroscopy and resistivity measurements
• Collective spin resonance excitation in the gapped itinerant multipole hidden order phase of URu2Si2
• URu${}_2$Si${}_2$ under intense magnetic fields: from hidden order to spin-density wave
• Magneto-transport properties of CeRu${}_2$Al${}_{10}$: Similarities to URu${}_2$Si${}_2$
• One-dimensional moire charge density wave in the hidden order state of URu2Si2 induced by fracture
• Ungapped magnetic excitations beyond Hidden Order in URu${}_{2-x}$Re${}_x$Si${}_2$