The electronic structure of the unconventional superconductor UTe$_2$ was studied by resonant photoelectron spectroscopy (RPES) and angle-resolved (ARPES) with soft X-ray synchrotron radiation. partial $\mathrm{U}~5f$ density states were imaged $\mathrm{U}~4d$--$5f$ RPES it found that state has an itinerant character, but there exists incoherent peak due to strong electron correlation effects. Furthermore, anomalous admixture into $\mathrm{Te}~5p$ bands observed at a higher binding energy,...

We have performed angle-resolved photoelectron spectroscopy experiments in the soft x-ray region order to clarify band structure and Fermi surfaces (FSs) of URu${}_{2}$Si${}_{2}$. In vicinity level, U 5$f$--derived quasiparticle bands were clearly observed. They form a small large hole FS centered at Z point electron $\ensuremath{\Gamma}$ point. The overall as well FSs are explained by calculation treating all 5$f$ electrons being itinerant. observed nesting vectors which give possible...

High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy Fermion uranium compounds UGe2, UCoGe, URhGe, URu2Si2, UNi2Al3, UPd2Al3, UPt3 as well typical localized itinerant to understand relationship between valence state their spectral line shapes. In addition main high-binding energy satellite structure recognized in spectra of compounds, a shoulder on lower binding side lines nearly was also found. The shapes show systematic...

Muon-spin relaxation results on the pyrochlore iridate Nd$_2$Ir$_2$O$_7$ are reported. Spontaneous coherent muon-spin precession below metal-insulator transition (MIT) temperature of about 33 K is observed, indicating appearance a long-ranged magnetic ordering Ir$^{4+}$ moments. With further decrease in temperature, internal field at muon site increases again 9 K. The second increase suggests Nd$^{3+}$ moments, which consistent with previous neutron experiment. Our suggest that MIT and...

The electronic structures of the ferromagnetic superconductors $\mathrm{UGe}_2$ and $\mathrm{UCoGe}$ in paramagnetic phase were studied by angle-resolved photoelectron spectroscopy using soft X-rays ($h\nu =400-500$). quasi-particle bands with large contributions from $\mathrm{U}~5f$ states observed vicinity $E_\mathrm{F}$, suggesting that electrons these compounds have an itinerant character. Their overall band explained band-structure calculations treating all as being itinerant....

We have performed elastic and inelastic neutron scattering experiments on the solid solutions U(Ru_{1-x}Rh_x)_2Si_2 for Ru rich concentrations: x=0, 0.01, 0.02, 0.025, 0.03, 0.04 0.05. Hidden order is suppressed with increasing x, correspondingly onset temperature T_m (~ 17.5 K at x=0) of weak antiferromagnetic (AF) Bragg reflection decreases. For x=0.04 0.05, no magnetic detected in investigated range down to 1.4 K. In middle range, 0.02 <= x we found that AF strongly enhanced. At x=0.02,...

The magnetic ground state of the Rh-doped Kondo semiconductor CeRu${}_{2}$Al${}_{10}$ [Ce(Ru${}_{1\ensuremath{-}x}$Rh${}_{x}$)${}_{2}$Al${}_{10}$] is investigated with muon spin relaxation method. Muon precession two frequencies observed in $x=0$ sample, while only one frequency present $x=0.05$ and 0.10 samples, which attributed to broad static field distribution at site. internal site enhanced from about 180 G sample 800 supporting spin-flop transition as suggested by magnetization...

The valence state of UTe$_2$ was studied by core-level photoelectron spectroscopy. main peak position the U $4f$ spectrum coincides with that UB$_2$, which is an itinerant compound a nearly $5f^3$ configuration. However, broader than and satellite structures are observed in higher binding energy side peak, characteristics mixed-valence uranium compounds. These results suggest 5$f$ mixed dominant contribution from

We have studied a puzzling phase below 17.5 K of URu2Si2 by means resonant X-ray scattering (RXS) near the U MIV absorption edge (E ~ 3.73 keV), using high-quality single-crystalline sample with low residual stress. reconfirm that commensurate (003) superlattice reflection comes purely from antiferromegnetic dipolar order ordering wave vector QAF = (1, 0, 0). No other traces significant RXS been detected in major region (h0l) plane, indicating absence quadrupolar within searched Q range...

The electronic structure of the ferromagnetic superconductor URhGe in paramagnetic phase has been studied by angle-resolved photoelectron spectroscopy using soft x rays ($h\ensuremath{\nu}=595$--700 eV). Dispersive bands with large contributions from U 5$f$ states were observed ARPES spectra and form Fermi surfaces. band is partly explained band-structure calculation treating all electrons as being itinerant, suggesting that an itinerant description a good starting point for this compound....

We performed elastic neutron scattering experiments on solid solution CeRh1-xCoxIn5 with x=0.4 to clarify the nature of antiferromagnetic (AF) phase in vicinity quantum critical point. observed incommensurate AF order below T_Nh=3.5 K. The structure is basically unchanged from that for pure CeRhIn5. further found evolution a new commensurate modulation q_c=(1/2,1/2,1/2) T_Nc=2.9 volume-averaged moments and phases are 0.38 mu_B/Ce 0.21 mu_B/Ce, respectively, which reduced moment (0.75...

The presence of a time-reversal symmetry-breaking field in the hidden order and superconducting states URu2Si2 has been studied by muon spin relaxation (μSR) spectroscopy. development an internal magnetic observed state. Longitudinal-field μSR experiments have shown that is static on time scale μSR. both a- c-axis components at sites was revealed transverse-field experiments. This contrast to pressure-induced antiferromagnetic state, where parallel c-axis. We also found rate further enhanced...

We have succeeded in growing single crystals of the heavy-fermion superconductor CeCo(In1-xZnx)5 with x<=0.07. Measurements specific heat, electrical resistivity, dc magnetization and ac susceptibility revealed that superconducting (SC) transition temperature Tc decreases from 2.25 K (x=0) to 1.8 (x=0.05) by doping Zn into CeCoIn5. Furthermore, these measurements indicate a development new ordered phase below T_o ~ 2.2 for x=>0.05, characterized reduced resistivity phase, enhancement heat at...

The spin dynamics, crystalline-electric-field (CEF) level scheme, specific heat, and x-ray photoemission spectra (XPS) of ${\mathrm{Ce}}_{3}{\mathrm{Rh}}_{4}{\mathrm{Sn}}_{13}$ were investigated, which exhibits anomalous semimetal transport in the chiral crystallographic phase. CEF excitations observed at approximately 7 39 meV are consistent with two inequivalent Ce-ion cites structure. Because broader a strong $4{f}^{1}$ peak Fermi Ce $4f$ on-resonance spectrum, hybridized electrons...

The superconducting properties of the noncentrosymmetric superconductor LaPt3Si were investigated by \(\mu\)SR spectroscopy. Within experimental accuracy, spontaneous internal fields not observed in phase zero-field experiments. Transverse-field experiments revealed coexistence intermediate and mixed states phase, which are characteristic features type-I type-II superconductors, respectively. We found that anomalous field distribution is consistent with results a recent numerical calculation...

We have used the pulsed muon source at ISIS to study high-temperature Na-ion dynamics in quasi-one-dimensional (Q1D) metallic antiferromagnet NaV2O4. By performing systematic zero-field and longitudinal-field measurements as a function of temperature we clearly distinguish that hopping rate increases exponentially above Tdiff ≈ 250 K. The data is well fitted an Arrhenius type equation typical for diffusion process, showing Na-ions starts be mobile Tdiff. Such results make this compound very...

The elastic neutron-scattering experiments were carried out on the solid solutions ${\text{CeRh}}_{1\ensuremath{-}x}{\text{Co}}_{x}{\text{In}}_{5}$ to clarify nature of antiferromagnetic (AF) state in vicinity quantum critical point: ${x}_{c}\ensuremath{\sim}0.8$. incommensurate AF order with wave vector ${q}_{h}=(1/2,1/2,\ensuremath{\sim}0.3)$ observed pure ${\text{CeRhIn}}_{5}$ is weakly suppressed upon doping Co, and a commensurate ${q}_{c}=(1/2,1/2,1/2)$ an...

Partially Ni-substituted electron-doped superconducting cuprates of Eu 1.85 Ce 0.15 Cu 1- y Ni O 4+α -δ (ECCNO) with = 0, 0.01, 0.02 and 0.05 have been studied by muon-spin-relaxation (mSR) measurements, in order to elucidate whether or not the dynamical stripe correlations spins charges exist cuprates. It has found that development Cu-spin correlation is induced at low temperatures through substitution that, for 0.02, a muon-spin precession due long-range magnetic observed 10 K. These...

Poly (3-hexylthiohene) (P3HT) has attracted much attention due to their chemical and thermal stability as well potential be used an active material in solar cells. Recently, hybrid cell been developed the combining advantages of organic inorganic such nanoparticle zinc oxide (ZnO). ZnO is with high electron mobility easy prepare acceptor dissociate excitons formed conjugated polymer also can prepared a that resolve problem small exciton diffusion length P3HT. However, clearly explanation...

The magnetic and electronic properties of Sr1-xLaxRuO3 were studied by means dc-magnetization, ac-susceptibility, specific heat, electrical resistivity measurements. dc-magnetization ac-susceptibility measurements have revealed that the transition temperature ordered moment ferromagnetic order are strongly suppressed as La is substituted for Sr. exhibits a peak at T* due to occurrence spontaneous spin polarization. Furthermore, we observed shows clear frequency variations x>= 0.3. magnitude...

Diamond-type structure allotrope α-Sn is attracting much attention as a topological Dirac semimetal (TDS). In this study, we demonstrate that undergoes phase transition to another β-Sn with superconductivity at low temperature by irradiating focused Ga ion beam (FIB). To clarify the mechanism, performed x-ray photoemission spectroscopy (XPS) measurements on an thin film irradiated FIB and as-grown film. The XPS results suggest local annealing, which one of side effects FIB, causes...

BiS2-based superconductors have attracted considerable attention owing to the possible occurrence of exotic superconductivity. Recently, superconducting critical temperature (Tc) La(O,F)BiS2 has been reported be enhanced with Pb or Sn doping. In this study, we performed photoelectron holography (PEH) and core-level spectroscopy (PES) clarify substituted site valence state atoms in Sn-substituted La(O,F)BiS2. The PEH study revealed that are incorporated into Bi sites. A PES suggested is close...