Parasitic small-moment-antiferromagnetism and non-linear coupling of hidden order and antiferromagnetism in URu2Si2 observed by Larmor diffraction

Abstract

We report simultaneous measurements of the distribution of lattice constants and the antiferromagnetic moment in high-purity URu2Si2, using both Larmor and conventional neutron diffraction, as a function of temperature and pressure up to 18 kbar. We establish that the tiny moment in the hidden order (HO) state is purely parasitic and quantitatively originates from the distribution of lattice constants. Moreover, the HO and large-moment antiferromagnetism (LMAF) at high pressure are separated by a line of first-order phase transitions, which ends in a bicritical point. Thus the HO and LMAF are coupled non-linearly and must have different symmetry, as expected of the HO being, e.g., incommensurate orbital currents, helicity order, or multipolar order.

4 pages, 4 figures

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Cited by in corpus (40)

• Colloquium: Hidden Order, Superconductivity, and Magnetism -- The Unsolved Case of URu2Si2
• Chirality density wave of the 'hidden order' phase in URu${}_2$Si${}_2$
• Electronic structure theory of the hidden order material URu${}_2$Si${}_2$
• Observation of the hybridization gap and Fano resonance in the Kondo lattice URu2Si2
• On the Hidden Order in URu${}_2$Si${}_2$ --- Antiferro Hexadecapole Order and its Consequences
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• Hybridization wave as the 'Hidden Order' in URu${}_2$Si${}_2$
• Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2
• Antiferromagnetic critical pressure in URu2Si2 under hydrostatic conditions
• Details of Sample Dependence and Transport Properties of URu2Si2
• The degree of 5f electron localization in URu2Si2: electron energy-loss spectroscopy and spin-orbit sum rule analysis
• Dual nature of 5$f$ electrons in the isostructural UM${}_2$Si${}_2$ family: from antiferro- to Pauli paramagnetism via hidden order
• 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
• Analogy between the "Hidden Order" and the Orbital Antiferromagnetism in URu${}_{2-x}$Fe${}_x$Si${}_2$
• Hybridization gap and anisotropic far-infrared optical conductivity of URu2Si2
• Study of the magnetic properties of URu2Si2 under uniaxial stress by neutron scattering
• Neutron scattering studies on URu2Si2
• Phase diagram and thermal expansion measurements on the system of URu_{2-x}Fe_xSi_2
• Broken symmetries in URu2Si2
• Absence of a static in-plane magnetic moment in the "hidden-order" phase of URu${}_2$Si${}_2$
• Pressure-Induced Rotational Symmetry Breaking in URu${}_2$Si${}_2$
• Strict limit on in-plane ordered magnetic dipole moment in URu2Si2
• Pressure-Tuned Point-Contact Spectroscopy of URu2Si2 from Hidden Order to Antiferromagnetic States: Similarity of the Fermi Surface Gapping
• High-magnetic field lattice length changes in URu2Si2
• Isoelectronic perturbations to $f$-$d$-electron hybridization and the enhancement of hidden order in URu${}_2$Si${}_2$
• Trends in Heavy Fermion Matter
• Detailed optical spectroscopy of the hybridization gap and the hidden order transition in high quality URu${}_2$Si${}_2$ single crystals
• Local suppression of the hidden order phase by impurities in URu2Si2
• Strong Correlation between Anomalous Quasiparticle Scattering and Unconventional Superconductivity in Hidden Order Phase of URu${}_2$Si${}_2$
• Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu${}_2$Si${}_2$
• Electrodynamics of the antiferromagnetic phase in URu${}_2$Si${}_2$
• Observation of Electronic Structure Modification in the Hidden Order Phase of CeCoSi
• Magnetic-field-induced chiral hidden order in URu2Si2
• Origin of gap-like behaviors in URu${}_2$Si${}_2$: Combined study via quasiparticle scattering spectroscopy and resistivity measurements
• Ultrasonic Study of the Hidden Order and Heavy-Fermion State in URu${}_2$Si${}_2$ with Hydrostatic Pressure, Rh-doping, and High-Magnetic Fields
• Fe substitution in URu${}_2$Si${}_2$: singlet magnetism in an extended Doniach phase diagram
• URu${}_2$Si${}_2$ under intense magnetic fields: from hidden order to spin-density wave
• Collinear antiferromagnetic order in URu${}_2$Si${}_{2-x}$P${}_x$ revealed by neutron diffraction
• Magnetic transitions induced by pressure and magnetic field in a two-orbital $5f$-electron model in cubic and tetragonal lattices