H. J. Park

Temperature evolution of itinerant ferromagnetism in SrRuO3 probed by optical spectroscopy.

The temperature (T) dependence of the optical conductivity spectra σ(ω) of a single crystal SrRuO(3) thin film is studied over a T range from 5 to 450 K. We observed significant T dependence of the spectral weights of the charge transfer and interband d-d transitions across the ferromagnetic Curie temperature (T(c) ∼ 150 K). Such T dependence was attributed to the increase in the Ru spin moment, which is consistent with the results of density functional theory calculations. T scans of σ(Ω,T) at fixed frequencies Ω reveal a clear T(2) dependence below T(c), demonstrating that the Stoner mechanism is involved in the evolution of the electronic structure. In addition, σ(Ω,T) continues to evolve at temperatures above T(c), indicating that the local spin moment persists in the paramagnetic state. This suggests that SrRuO(3) is an intriguing oxide system with itinerant ferromagnetism.

Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7

We examined the temperature (T) evolution of the optical conductivity spectra of Sr

Optical Spectroscopic Studies of the Metal-Insulator Transition Driven by All-In-All-Out Magnetic Ordering in 5d Pyrochlore Cd(2)Os(2)O(7).

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Strong Spin-Phonon Coupling Mediated by Single Ion Anisotropy in the All-In–All-Out Pyrochlore Magnet Cd2Os2O7

Ir

Orbital-dependent polaron formation in the relativistic Mott insulator Sr 2 IrO 4

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Mixing betweenJeff=12and32orbitals in Na2IrO3: A spectroscopic and density functional calculation study

O

オール‐イン―オール‐アウトパイロクロア型磁性体Cd2Os2O7中の単一イオンの異方性によって媒介される強いスピン‐フォノン結合

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Electrodynamic properties of the semimetallic Dirac material SrMnBi2 : Two-carrier-model analysis

over a wide range of 10-400 K. The system was barely insulating, exhibiting a small indirect bandgap of

Phonon assisted optical excitation in narrow bandgap spin-orbit insulator Sr

\sim

_{3}

0.1 eV. The low-energy features of the optical d-d excitation (