X-ray-induced electronic structure change in CuIr2S4

Abstract

The electronic structure of CuIr2S4 has been investigated using various bulk-sensitive x-ray spectroscopic methods near the Ir L3-edge: resonant inelastic x-ray scattering (RIXS), x-ray absorption spectroscopy in the partial fluorescence yield (PFY-XAS) mode, and resonant x-ray emission spectroscopy (RXES). A strong RIXS signal (0.75 eV) resulting from a charge-density-wave gap opening is observed below the metal-insulator transition temperature of 230 K. The resultant modification of electronic structure is consistent with the density functional theory prediction. In the spin-and charge-dimer disordered phase induced by x-ray irradiation below 50 K, we find that a broad peak around 0.4 eV appears in the RIXS spectrum.

Magnetic excitation spectrum of Na2IrO3probed with resonant inelastic x-ray scattering

“…1 (c) we compare spectra taken at E i = 11.217 keV and E i = 11.220 keV. At E i = 11.220 keV, corresponding to exciting an Ir 2p 3/2 core electron into the unoccupied Ir 5d e g level, 33 we notice a drastic drop in A 0 intensity. In Fig.…”

Theoretical investigation of the electronic and magnetic properties of the orthorhombic phase ofBa(Fe1−xCox)2Derondeau1, Polesya2, Mankovsky3 et al. 2014Phys. Rev. B91160View full textAdd to dashboardCite

“…7,[16][17][18][19] Experimental neutron diffraction data predicts for the low-temperature phase of BaFe 2 As 2 magnetic moments around 0.9µ B per Fe atom (0.99µ B in Sn flux 16 , 0.87µ B for powder probes 20 ), while from 57 Fe Mössbauer spectroscopy 17,21 and µSR spectroscopy 22,23 consistently a value of around 0.5µ B is estimated. However, in density functional theory (DFT) calculations the magnitude of the magnetic moments is considerably overestimated, ranging from approximately 1.2µ B up to 2.6µ B .…”

Crystal field splitting inSrn+1IrnO3n+1Sala1, Rossi2, Al-Zein3 et al. 2014Phys. Rev. B

“…For example, in the case of the Lα 1 (Lα 2 ) emission line of iridium, if Γ 2p is the lifetime broadening of the 2p 3/2 core-hole, and Γ 3d is that of the 3d 5/2 (3d 3/2 ) core-hole, then the PFY broadening will be given by 1/ 1/Γ 2 2p + 1/Γ 2 3d ≈ Γ 3d , since Γ 3d ≪ Γ 2p . However, even if the benefits of PFY XAS are evident, it is still difficult to extract quantitative information on 10Dq from such measurements 27,28 .…”