Direct Observation of Quadrupolar Excitons in the Heavy-Fermion Superconductor PrOs${}_4$Sb${}_{12}$

Abstract

We report inelastic neutron scattering experiments performed to investigate the low energy magnetic excitations on single crystals of the heavy-fermion superconductor PrOs${}_4$Sb${}_{12}$. The observed excitation clearly softens at a wave vector Q = (1,0,0), which is the same as the modulation vector of the field-induced antiferro-quadrupolar ordering, and its intensity at Q = (1,0,0) is smaller than that around the zone center. This result directly evidences that this excitonic behavior is derived mainly from nonmagnetic quadrupolar interactions. Furthermore, the narrowing of the linewidths of the excitations below the superconducting transition temperature indicates the close connection between the superconductivity and the excitons.

4 pages, 4 figures

References in corpus (9)

• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12
• Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
• Evidence for Unconventional Strong-coupling Superconductivity in PrOs_4Sb_12 : An Sb Nuclear Quadrupole Resonance (NQR) Study
• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• The Crystal Field Potential of PrOs4Sb12: Consequences for Superconductivity
• Field Dependence of Electronic Specific Heat in Two-Band Superconductors
• Evolution of crystalline electric field effects, superconductivity, and heavy fermion behavior in the specific heat of Pr(Os${}_{1-x}$Ru${}_x$)${}_4$Sb${}_{12}$
• Exciton Mediated Superconductivity in PrOs4Sb12

Cited by in corpus (31)

• Superconducting phases of f-electron compounds
• Excitonic Magnetism in Van Vleck-type d^4 Mott Insulators
• Simultaneous Superconducting and Antiferroquadrupolar Transitions in PrRh${}_2$Zn${}_{20}$
• Mixed-Valence-Driven Heavy-Fermion Behavior and Superconductivity in KNi${}_2$Se${}_2$
• Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu${}_5$Rh${}_6$Sn${}_{18}$
• Magnetic-Field-Induced 4f-Octupole in CeB6 Probed by Resonant X-ray Diffraction
• Molecular spin-orbit excitations in the J_eff = 1/2 frustrated spinel GeCo${}_2$O${}_4$
• Unconventional superconductivity in the cage type compound Sc${}_5$Rh${}_6$Sn${}_{18}$
• Magnetic order in Pr2Pd3Ge5 and possible heavy fermion behavior in Pr2Rh3Ge5
• Superconducting properties of Pr-based Filled skutterudite PrRu${}_4$As${}_{12}$
• Double superconducting transition in the filled skutterudite PrOs4Sb12 and sample characterizations
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Evolution of the spin resonance in CeCoIn${}_5$ under magnetic field
• Eliashberg theory of superconductivity and inelastic rare-earth impurity scattering in filled skutterudite La${}_{1-x}$Pr${}_x$Os${}_4$Sb${}_{12}$
• Linear dichroism in angle-resolved core-level photoemission spectra reflecting 4f ground-state symmetry of strongly correlated cubic Pr compounds
• Field dependent mass enhancement in Pr_{1-x}La_xOs_4Sb_12 from aspherical Coulomb scattering
• 123Sb-NQR study of unconventional superconductivity in the filled skutterudite heavy-fermion compound PrOs4Sb12 under high pressure up to P = 3.82 GPa
• Penetration depth study of LaOs${}_4$Sb${}_{12}$: Multiband s-wave superconductivity
• Pressure-enhanced superconductivity in cage-type quasiskutterudite Sc5Rh6Sn18 single crystal
• Multipole Ordering and Fluctuations in f-Electron Systems
• Nonadiabatic effects of rattling phonons and 4f excitations in Pr(Os{1-x}Ru{x})4Sb12
• Distinct Kondo Screening Behaviors in Heavy Fermion Filled Skutterudites with 4f1 and 4f2 Configurations
• Simultaneous collapse of antiferroquadrupolar order and superconductivity in PrIr${}_2$Zn${}_{20}$ by nonhydrostatic pressure
• Inelastic neutron scattering study of crystalline electric field excitations in the caged compounds NdT2Zn20 (T = Co, Rh, and Ir)
• Suppression of hidden order in URu2Si2 under pressure and restoration in magnetic field
• Muon spin rotation and relaxation in Pr${}_{1-x}$Nd${}_x$Os${}_4$Sb${}_{12}$: Paramagnetic states
• Broken time-reversal symmetry in cubic skutterudite-like superconductor Y${}_3$Ru${}_4$Ge${}_{13}$
• Anisotropic physical properties of PrRhAl${}_4$Si${}_2$ single crystal a non-magnetic singlet ground state compound
• Inelastic neutron scattering studies of Crystal Field Levels in PrOs${}_4$As${}_{12}$
• Effects of Impurities with Singlet-Triplet Configuration on Multiband Superconductors
• Controlled pairing symmetry of the superfluid state in systems of three-component repulsive fermionic atoms in optical lattices