Direct bulk sensitive probe of 5f symmetry in URu2Si2

Abstract

The second-order phase transition into a hidden order phase in URu${}_2$Si${}_2$ goes along with an order parameter which is still a mystery, despite 30 years of research. However, it is understood that the symmetry of the order parameter must be related to the symmetry of the low lying local electronic $f$-states. Here we present results of a novel spectroscopy, namely core-level non-resonant inelastic x-ray scattering (NIXS). This method allows for the measurement of local high-multipole excitations and it is bulk sensitive. The observed anisotropy of the scattering function unambiguously shows that the 5$f$ ground state wave function is composed mainly, but essentially not purely, of the ${\Gamma }_1$ with majority $J_z$ =$|4⟩$ + $|-4⟩$ and/or ${\Gamma }_2$ singlet states.

9 pages, 6 figures

References in corpus (16)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Imaging the Fano Lattice to 'Hidden Order' Transition in URu2Si2
• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Exotic Superconducting Properties in the Electron-Hole Compensated Heavy Fermion `Semimetal' URu2Si2
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• Emergent Rank-5 'Nematic' Order in URu2Si2
• Hastatic Order in URu2Si2
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• Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy
• Direct observation of lattice symmetry breaking at the hidden-order transition in URu2Si2
• Determining the in-plane orientation of the ground-state orbital of CeCu2Si2
• The degree of 5f electron localization in URu2Si2: electron energy-loss spectroscopy and spin-orbit sum rule analysis
• Spectroscopic determination of the atomic f-electron symmetry underlying hidden order in URu${}_2$Si${}_2$
• Probing 5f-state configurations in URu2Si2 with U L3-edge resonant x-ray emission spectroscopy
• Symmetry of the Excitations in the Hidden Order State of URu2Si2

Cited by in corpus (7)

• Resonant x-ray spectroscopy of uranium intermetallics at the U $M_{4,5}$ edges
• 4$f$ crystal field ground state of the strongly correlated topological insulator SmB${}_6$
• Analogy between the "Hidden Order" and the Orbital Antiferromagnetism in URu${}_{2-x}$Fe${}_x$Si${}_2$
• Direct imaging of orbitals in quantum materials
• High temperature singlet-based magnetism from Hund's rule correlations
• Large positive correlation between the effective electron mass and the multipolar fluctuation in the heavy-fermion metal Ce${}_{1-x}$La${}_x$B${}_6$
• On the possibility to detect multipolar order in URu${}_2$Si${}_2$ by the electric quadrupolar transition of resonant elastic X-ray scattering