JOPSS - Search Results

Journal Articles

Polarization dependence of soft X-ray absorption spectroscopy on the heavy fermion superconductor CeNi $_{2}$ Ge $_{2}$

Fujiwara, Hidenori*; Nakatani, Yasuhiro*; Aratani, Hidekazu*; Kanai-Nakata, Yuina*; Yamagami, Kohei*; Hamamoto, Satoru*; Kiss, Takayuki*; Sekiyama, Akira*; Tanaka, Arata*; Ebihara, Takao*; et al.

New Physics; Sae Mulli, 73(12), p.1062 - 1066, 2023/12

https://doi.org/10.3938/NPSM.73.1062

Journal Articles

Impact of the ground-state 4 symmetry for anisotropic hybridization in the heavy-fermion superconductor CeNi $_{2}$ Ge $_{2}$

Fujiwara, Hidenori*; Nakatani, Yasuhiro*; Aratani, Hidekazu*; Kanai, Yuina*; Yamagami, Kohei*; Hamamoto, Satoru*; Kiss, Takayuki*; Yamasaki, Atsushi*; Higashiya, Atsushi*; Imada, Shin*; et al.

Physical Review B, 108(16), p.165121_1 - 165121_10, 2023/10

https://doi.org/10.1103/PhysRevB.108.165121

Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)

Journal Articles

Revising the 4 symmetry in CeCu $_{2}$ Ge $_{2}$ ; Soft X-ray absorption and hard X-ray photoemission spectroscopy

Aratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.

Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09

AA2018-0352.pdf:1.16MB

https://doi.org/10.1103/PhysRevB.98.121113

Times Cited Count：5 Percentile：25.82(Materials Science, Multidisciplinary)

Journal Articles

Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi $_{2}$ Ge $_{2}$ in the normal state

Nakatani, Yasuhiro*; Aratani, Hidekazu*; Fujiwara, Hidenori*; Mori, Takeo*; Tsuruta, Atsushi*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; et al.

Physical Review B, 97(11), p.115160_1 - 115160_7, 2018/03

AA2018-0003.pdf:1.65MB

https://doi.org/10.1103/PhysRevB.97.115160

Times Cited Count：5 Percentile：20.71(Materials Science, Multidisciplinary)

Journal Articles

Electronic structure and magnetic properties of the half-metallic ferrimagnet Mn $_{2}$ VAl probed by soft X-ray spectroscopies

Nagai, Kodai*; Fujiwara, Hidenori*; Aratani, Hidekazu*; Fujioka, Shuhei*; Yomosa, Hiroshi*; Nakatani, Yasuhiro*; Kiss, Takayuki*; Sekiyama, Akira*; Kuroda, Fumiaki*; Fujii, Hitoshi*; et al.

Physical Review B, 97(3), p.035143_1 - 035143_8, 2018/01

AA2017-0644.pdf:1.01MB

https://doi.org/10.1103/PhysRevB.97.035143

Times Cited Count：21 Percentile：70.17(Materials Science, Multidisciplinary)

We have studied the electronic structure of ferrimagnetic Mn $_{2}$ VAl single crystals by means of soft X-ray absorption spectroscopy (XAS), X-ray absorption magnetic circular dichroism (XMCD), and resonant soft X-ray inelastic scattering (RIXS). We have successfully observed the XMCD signals for all the constituent elements. The Mn L $_{2,3}$ XAS and XMCD spectra are reproduced by spectral simulations based on density-functional theory, indicating the itinerant character of the Mn 3 states. On the other hand, the V 3 electrons are rather localized since the ionic model can qualitatively explain the V L $_{2,3}$ XAS and XMCD spectra. This picture is consistent with local excitations revealed by the V L $_{3}$ RIXS.

Journal Articles

Experimental observation of temperature and magnetic-field evolution of the 4 states in CeFe $_{2}$ revealed by soft X-ray magnetic circular dichroism

Saito, Yuji; Yasui, Akira*; Fuchimoto, Hiroto*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Imada, Shin*; Narumi, Yasuo*; Kindo, Koichi*; Takahashi, Minoru*; Ebihara, Takao*; et al.

Physical Review B, 96(3), p.035151_1 - 035151_5, 2017/07

AA2017-0611.pdf:0.36MB

https://doi.org/10.1103/PhysRevB.96.035151

Times Cited Count：3 Percentile：17.1(Materials Science, Multidisciplinary)

We revisit the delocalized character of the 4 states of CeFe in the ferromagnetically ordered phase by X-ray magnetic circular dichroism (XMCD) in X-ray absorption spectroscopy (XAS) with improved data quality using single crystals. Surprisingly, the Ce $M_{4,5}$ XMCD spectral shape changes significantly as a function of temperature and applied magnetic field, with no concomitant changes in the spectral shape of the Ce $M_{4,5}$ XAS as well as the Fe $L_{2,3}$ XAS and XMCD. This unusual behavior is characterized by the states in a 4 configuration mixed into the ground state. Such extreme sensitivity of the Ce 4 states to the external perturbations can be related to the magnetic instability toward an antiferromagnetic phase in CeFe. Our experimental data presented here provide valuable insights into the underlying physics in strongly-hybridized ferromagnetic Ce compounds.

Journal Articles

Circular dichroism in resonant angle-resolved photoemission spectra of LaNi $_{2}$ Ge $_{2}$

Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Aratani, Hidekazu*; Mori, Takeo*; Tachibana, Shoichi*; Yamaguchi, Takashi*; Kiss, Takayuki*; Yamasaki, Atsushi*; Yasui, Akira*; Yamagami, Hiroshi*; et al.

Journal of Electron Spectroscopy and Related Phenomena, 220, p.50 - 53, 2017/01

https://doi.org/10.1016/j.elspec.2017.01.008

Times Cited Count：2 Percentile：17.1(Spectroscopy)

We report the soft X-ray angle-resolved photoemission study for LaNi $_{2}$ Ge $_{2}$ to reveal the electronic structures derived from non-4 bands of the heavy fermion compound CeNi $_{2}$ Ge $_{2}$ . The photoemission spectra recorded at the La M $_{4,5}$ absorption edges clearly show the enhancement of the La 5 components in the valence band spectra. The circular dichroism of photoemission spectra reveals the band-dependent dichroic response due to the orbital symmetry.

Journal Articles

Electronic structures of ferromagnetic CeAgSb $_{2}$ ; Soft X-ray absorption, magnetic circular dichroism, and angle-resolved photoemission spectroscopies

Saito, Yuji; Fujiwara, Hidenori*; Yamaguchi, Takashi*; Nakatani, Yasuhiro*; Mori, Takeo*; Fuchimoto, Hiroto*; Kiss, Takayuki*; Yasui, Akira*; Miyawaki, Jun*; Imada, Shin*; et al.

Journal of the Physical Society of Japan, 85(11), p.114713_1 - 114713_7, 2016/11

https://doi.org/10.7566/JPSJ.85.114713

Times Cited Count：15 Percentile：68.09(Physics, Multidisciplinary)

We report on the electronic structures of ferromagnetic CeAgSb $_{2}$ using soft X-ray absorption (XAS), magnetic circular dichroism (XMCD), and angle-resolved photoemission (ARPES) spectroscopies. The Ce $M_{4,5}$ XAS spectra show very small satellite structures, reflecting a strongly localized character of the Ce 4 electrons. The linear dichroism effects in the Ce $M_{4,5}$ XAS spectra demonstrate the ground-state Ce 4 symmetry of $_{6}$ , the spatial distribution of which is directed along the -axis. Nevertheless, ARPES spectra at the Ce 3-4 resonance show the momentum dependence of the intensity ratio between Ce 4 $f^{1}_{5/2}$ and 4 $f^{1}_{7/2}$ peaks in a part of the Brillouin zone, suggesting the non negligible momentum-dependent hybridization effect between the Ce 4 and the conduction electrons. This is associated with the moderate mass enhancement in CeAgSb $_{2}$ .

Journal Articles

Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates

Yamasaki, Atsushi*; Fujiwara, Hidenori*; Tachibana, Shoichi*; Iwasaki, Daisuke*; Higashino, Yuji*; Yoshimi, Chiaki*; Nakagawa, Koya*; Nakatani, Yasuhiro*; Yamagami, Kohei*; Aratani, Hidekazu*; et al.

Physical Review B, 94(11), p.115103_1 - 115103_10, 2016/11

AA2016-0587.pdf:2.55MB

https://doi.org/10.1103/PhysRevB.94.115103

Times Cited Count：17 Percentile：61.21(Materials Science, Multidisciplinary)

In this study, we systematically investigate three-dimensional(3D) momentum-resolved electronic structures of Ruddlesden-Popper-type iridium oxides Sr $_{n+1}$ Ir $_{n}$ O $_{3n+1}$ using soft-X-ray angle-resolved photoemission spectroscopy (SX-ARPES). Our results provide direct evidence of an insulator-to-metal transition that occurs upon increasing the dimensionality of the IrO $_{2}$ -plane structure. This transition occurs when the spin-orbit-coupled $j_{eff}$ = 1/2 band changes its behavior in the dispersion relation and moves across the Fermi energy. By scanning the photon energy over 350 eV, we reveal the 3D Fermi surface in SrIrO $_{3}$ and $k_{z}$ -dependent oscillations of photoelectron intensity in Sr $_{3}$ Ir $_{2}$ O $_{7}$ . To corroborate the physics deduced using low-energy ARPES studies, we propose to utilize SX-ARPES as a powerful complementary technique, as this method surveys more than one whole Brillouin zone and provides a panoramic view of electronic structures.

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Polarization dependence of soft X-ray absorption spectroscopy on the heavy fermion superconductor CeNi $_{2}$ Ge $_{2}$

Impact of the ground-state 4 symmetry for anisotropic hybridization in the heavy-fermion superconductor CeNi $_{2}$ Ge $_{2}$

Revising the 4 symmetry in CeCu $_{2}$ Ge $_{2}$ ; Soft X-ray absorption and hard X-ray photoemission spectroscopy

Evidence for momentum-dependent heavy fermionic electronic structures; Soft X-ray ARPES for the superconductor CeNi $_{2}$ Ge $_{2}$ in the normal state

Electronic structure and magnetic properties of the half-metallic ferrimagnet Mn $_{2}$ VAl probed by soft X-ray spectroscopies

Experimental observation of temperature and magnetic-field evolution of the 4 states in CeFe $_{2}$ revealed by soft X-ray magnetic circular dichroism

Circular dichroism in resonant angle-resolved photoemission spectra of LaNi $_{2}$ Ge $_{2}$

Electronic structures of ferromagnetic CeAgSb $_{2}$ ; Soft X-ray absorption, magnetic circular dichroism, and angle-resolved photoemission spectroscopies

Three-dimensional electronic structures and the metal-insulator transition in Ruddlesden-Popper iridates