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Journal Articles

Detecting halfmetallic electronic structures of spintronic materials in a magnetic field

Fujiwara, Hidenori*; Umetsu, Rie*; Kuroda, Fumiaki*; Miyawaki, Jun*; Kashiuchi, Toshiyuki*; Nishimoto, Kohei*; Nagai, Kodai*; Sekiyama, Akira*; Irizawa, Akinori*; Takeda, Yukiharu; et al.

Scientific Reports (Internet), 11(1), p.18654_1 - 18654_9, 2021/09

 Times Cited Count:0 Percentile:0(Multidisciplinary Sciences)

Journal Articles

Insight into Kondo screening in the intermediate-valence compound SmOs$$_4$$Sb$$_{12}$$ uncovered by soft X-ray magnetic circular dichroism

Saito, Yuji; Fujiwara, Hidenori*; Yasui, Akira*; Kadono, Toshiharu*; Sugawara, Hitoshi*; Kikuchi, Daisuke*; Sato, Hideyuki*; Suga, Shigemasa*; Yamasaki, Atsushi*; Sekiyama, Akira*; et al.

Physical Review B, 102(16), p.165152_1 - 165152_8, 2020/10

 Times Cited Count:1 Percentile:6.74(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


 Times Cited Count:21 Percentile:71.72(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$$d$$ states. On the other hand, the V 3$$d$$ 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 $$dd$$ excitations revealed by the V L$$_{3}$$ RIXS.

Journal Articles

Probing strongly correlated 4$$f$$-orbital symmetry of the ground state in Yb compounds by linear dichroism in core-level photoemission

Mori, Takeo*; Kitayama, Satoshi*; Kanai, Yuina*; Naimen, Sho*; Fujiwara, Hidenori*; Higashiya, Atsushi*; Tamasaku, Kenji*; Tanaka, Arata*; Terashima, Kensei*; Imada, Shin*; et al.

Journal of the Physical Society of Japan, 83(12), p.123702_1 - 123702_5, 2014/12

 Times Cited Count:15 Percentile:68.94(Physics, Multidisciplinary)

We show that the strongly correlated 4$$f$$-orbital symmetry of the ground state is revealed by linear dichroism in core-level photoemission spectra, as we have discovered for YbRh$$_{2}$$Si$$_{2}$$ and YbCu$$_{2}$$Si$$_{2}$$. Theoretical analysis shows us that the linear dichroism reflects the anisotropic charge distributions resulting from a crystalline electric field. We have successfully determined the ground-state 4$$f$$ symmetry for both compounds from the polarization-dependent angle resolved core-level spectra at a temperature well below the first excitation energy. The excited-state symmetry is also probed by temperature dependence of the linear dichroism where the high measurement temperatures are on the order of the crystal-field-splitting energies.

Journal Articles

Direct $$kappa$$-space mapping of the electronic structure in an oxide-oxide interface

Berner, G.*; Sing, M.*; Fujiwara, Hidenori*; Yasui, Akira*; Saito, Yuji; Yamasaki, Atsushi*; Nishitani, Yoshihito*; Sekiyama, Akira*; Pavlenko, N.*; Kopp, T.*; et al.

Physical Review Letters, 110(24), p.247601_1 - 247601_5, 2013/06

 Times Cited Count:128 Percentile:96.63(Physics, Multidisciplinary)

The interface between LaAlO$$_{3}$$ and SrTiO$$_{3}$$ hosts a two-dimensional electron system of itinerant carriers, although both oxides are band insulators. Interface ferromagnetism coexisting with superconductivity has been found and attributed to local moments. Experimentally, it has been established that Ti 3$$d$$ electrons are confined to the interface. Using soft X-ray angle-resolved resonant photoelectron spectroscopy we have directly mapped the interface states in $$kappa$$ space. Our data demonstrate a charge dichotomy. A mobile fraction contributes to Fermi surface sheets, whereas a localized portion at higher binding energies is tentatively attributed to electrons trapped by O vacancies in the SrTiO$$_{3}$$.

Journal Articles

Photoemission study of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$ ($$M$$=Cr,Ti)

Mo, S.-K.*; Kim, H.-D.*; Denlinger, J. D.*; Allen, J. W.*; Park, J.-H.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Suga, Shigemasa*; Saito, Yuji; Muro, Takayuki*; et al.

Physical Review B, 74(16), p.165101_1 - 165101_12, 2006/10

 Times Cited Count:49 Percentile:85.11(Materials Science, Multidisciplinary)

We present high-resolution bulk-sensitive photoemission spectra of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$ ($$M$$=Cr,Ti). The measurements were made for the paramagnetic metal (PM), paramagnetic insulator (PI), and antiferromagnetic insulator (AFI) phases of (V$$_{1-x}$$$$M$$$$_{x}$$)$$_{2}$$O$$_{3}$$. In the PM phase, we observe a prominent quasiparticle peak in general agreement with theory, which combines dynamical mean-field theory with the local density approximation. For both the PI and AFI phases, the vanadium 3$$d$$ parts of the valence spectra are not simple one peak structures. For the PI phase, there is not yet a good theoretical understanding of these structures. Spectra taken in the same phases with different compositions show interesting monotonic changes as the dopant concentration increases, regardless of the dopant species. With increased Cr-doping, the AFI phase gap decreases and the PI phase gap increases.

Journal Articles

Photoemission spectroscopy and X-ray absorption spectroscopy studies of the superconducting pyrochlore oxide Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$

Irizawa, Akinori*; Higashiya, Atsushi*; Kasai, Shuichi*; Sasabayashi, Takehisa*; Shigemoto, Akihiko*; Sekiyama, Akira*; Imada, Shin*; Suga, Shigemasa*; Sakai, Hironori; Ono, Hiroyuki*; et al.

Journal of the Physical Society of Japan, 75(9), p.094701_1 - 094701_5, 2006/09

 Times Cited Count:6 Percentile:42.06(Physics, Multidisciplinary)

Photoemission spectroscopy (PES) and O $$1s$$ X-ray absorption spectroscopy (XAS) measurements have been performed for Cd$$_2$$ Re$$_2$$ O$$_7$$ single crystals. Temperature variations of their spectra reveal that the phase transition at 120 K directly changes the band structure near the Fermi level compared with another transition near 200 K. The roles of the transitions are discussed in terms of the changes in the Re-O orbital hybridization.

Journal Articles

Soft-X-ray high-resolution photoemission study on the valence transitions in YbInCu$$_{4}$$

Sato, Hitoshi*; Yoshikawa, Kunta*; Hiraoka, Koichi*; Arita, Masashi*; Fujimoto, Koji*; Kojima, Kenichi*; Muro, Takayuki*; Saito, Yuji; Sekiyama, Akira*; Suga, Shigemasa*; et al.

Physical Review B, 69(16), p.165101_1 - 165101_6, 2004/04

 Times Cited Count:33 Percentile:78.07(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Resonant photoemission spectroscopy study of impurity-induced melting in Cr- and Ru-doped Nd$$_{1/2}$$A$$_{1/2}$$MnO$$_{3}$$ (A=Ca,Sr)

Kang, J.-S.*; Kim, J. H.*; Sekiyama, Akira*; Kasai, Shuichi*; Suga, Shigemasa*; Han, S. W.*; Kim, K. H.*; Choi, E. J.*; Kimura, Tsuyoshi*; Muro, Takayuki*; et al.

Physical Review B, 68(1), p.012410_1 - 012410_4, 2003/07


 Times Cited Count:21 Percentile:68.37(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Prominent quasiparticle peak in the photoemission spectrum of the metallic phase of V$$_{2}$$O$$_{3}$$

Mo, S.-K.*; Denlinger, J. D.*; Kim, H.-D.*; Park, J.-H.*; Allen, J. W.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Kadono, Koji*; Suga, Shigemasa*; Saito, Yuji; et al.

Physical Review Letters, 90(18), p.186403_1 - 186403_4, 2003/05


 Times Cited Count:142 Percentile:95.56(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Bulk-sensitive photoemission spectroscopy of $$A_{2}$$FeMoO$$_{6}$$ double perovskites ($$A$$=Sr, Ba)

Kang, J.-S.*; Kim, J. H.*; Sekiyama, Akira*; Kasai, Shuichi*; Suga, Shigemasa*; Han, S. W.*; Kim, K. H.*; Muro, Takayuki*; Saito, Yuji; Hwang, C.*; et al.

Physical Review B, 66(11), p.113105_1 - 113105_4, 2002/09

 Times Cited Count:64 Percentile:90.11(Materials Science, Multidisciplinary)

The electronic structures of Sr$$_{2}$$FeMoO$$_{6}$$ (SFMO) and Ba$$_{2}$$FeMoO$$_{6}$$ (BFMO) double perovskites have been investigated using Fe 2p-3d resonant photoemission spectroscopy (PES) and the Cooper minimum in the Mo 4d photoionization cross section. The states close to the Fermi level are found to have a strongly mixed Mo–Fe t$$_{2g}$$ character, indicating that the Fe valence is far from pure 3+. The Fe 2p$$_{3/2}$$ x-ray absorption spectroscopy spectra reveal the mixed-valent Fe $$^{3+}$$–Fe$$^{2+}$$ configurations, and a larger Fe$$^{2+}$$ component for BFMO than for SFMO, suggesting an operative double exchange interaction. The valence-band PES spectra reveal good agreement with the local-spin-density-approximation (LSDA+U) calculation.

Journal Articles

High-resolution resonance photoemission study of Ce$$MX$$ ($$M$$=Pt, Pd; $$X$$=P, As, Sb)

Iwasaki, T.*; Sekiyama, Akira*; Yamasaki, Atsushi*; Okazaki, Makoto*; Kadono, Koji*; Utsunomiya, Hiroshi*; Imada, Shin*; Saito, Yuji; Muro, Takayuki*; Matsushita, Tomohiro*; et al.

Physical Review B, 65(19), p.195109_1 - 195109_9, 2002/05

 Times Cited Count:24 Percentile:71.99(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Orbital angular momentum and interpretation of core-absorption magnetic circular dichroism on the band picture in Co-based Heusler alloys Co$$_{2}Y$$Sn ($$Y$$=Ti, Zr, and Nb)

Yamasaki, Atsushi*; Imada, Shin*; Arai, Ryuji*; Utsunomiya, Hiroshi*; Suga, Shigemasa*; Muro, Takayuki*; Saito, Yuji; Kanomata, Takeshi*; Ishida, Shoji*

Physical Review B, 65(10), p.104410_1 - 104410_6, 2002/03

 Times Cited Count:60 Percentile:89.29(Materials Science, Multidisciplinary)

The magnetic circular dichroism (MCD) of core-level absorption [x-ray absorption spectroscopy (XAS)] spectra in the soft x-ray region has been measured for the ferromagnetic Heusler alloys Co$$_{2}$$TiSn, Co$$_{2}$$ZrSn, and Co$$_{2}$$NbSn. The many-peak structures which are clearly observed in the Co 2p-3d XAS-MCD spectra cannot be well explained by atomic multiplet calculations but are better explained by the Co 3d unoccupied states predicted by linear muffin-tin orbital atomic sphere approximation band structure calculations. The MCD spectra show an obvious contribution of the orbital angular momentum component to the magnetic moment in these alloys. The ratio between the orbital angular momentum and spin derived from the MCD spectra varies by more than a factor of 2 within these alloys. The mechanism of this variation is discussed in comparison with the band structure calculations.

Journal Articles

Soft X-ray beamline for spectroscopy of solids at SPring-8

Saito, Yuji; Kimura, Hiroaki*; Suzuki, Yoshio*; Nakatani, Takeshi*; Matsushita, Tomohiro*; Muro, Takayuki*; Miyahara, Tsuneaki*; Fujisawa, M.*; Soda, Kazuo*; Ueda, Shigenori*; et al.

Nuclear Instruments and Methods in Physics Research A, 467-468(Part.1), p.553 - 556, 2001/07

 Times Cited Count:23 Percentile:82.6(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Magnetic circular dichroism in the soft X-ray absorption spectra of intercalation compounds Fe$$_{x}$$TiS$$_{2}$$

Yamasaki, Atsushi*; Imada, Shin*; Utsunomiya, Hiroshi*; Muro, Takayuki*; Saito, Yuji; Negishi, H.*; Sasaki, M.*; Inoue, M.*; Suga, Shigemasa*

Physica E, 10(1-3), p.387 - 390, 2001/05

 Times Cited Count:5 Percentile:32.91(Nanoscience & Nanotechnology)

no abstracts in English

Journal Articles

Magnetic circular dichroism in Mn 2p core absorption of Ga$$_{1-x}$$Mn$$_{x}$$As

Ueda, Shigenori*; Imada, Shin*; Muro, Takayuki*; Saito, Yuji; Suga, Shigemasa*; Matsukura, F.*; Ohno, Hideo*

Physica E, 10(1-3), p.210 - 214, 2001/05

 Times Cited Count:24 Percentile:74.08(Nanoscience & Nanotechnology)

no abstracts in English

Journal Articles

High-resolution soft X-ray absorption spectroscopy of solids

Saito, Yuji; Muro, Takayuki*; Kotsugi, Masato*; Iwasaki, T.*; Sekiyama, Akira*; Imada, Shin*; Suga, Shigemasa*

Journal of Synchrotron Radiation, 8(Part2), p.339 - 341, 2001/03

no abstracts in English

Journal Articles

Performance of a very high resolution soft X-ray beamline BL25SU with a twin-helical undulator at SPring-8

Saito, Yuji; Kimura, Hiroaki*; Suzuki, Yoshio*; Nakatani, Takeshi*; Matsushita, Tomohiro*; Muro, Takayuki*; Miyahara, Tsuneaki*; Fujisawa, M.*; Soda, Kazuo*; Ueda, Shigenori*; et al.

Review of Scientific Instruments, 71(9), p.3254 - 3259, 2000/09

 Times Cited Count:184 Percentile:98.98(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Probing bulk states of correlated electron systems by high-resolution resonance photoemission

Sekiyama, Akira*; Iwasaki, T.*; Matsuda, K.*; Saito, Yuji; Onuki, Yoshichika*; Suga, Shigemasa*

Nature, 403(6768), p.396 - 398, 2000/01

 Times Cited Count:252 Percentile:98.94(Multidisciplinary Sciences)

no abstracts in English

Journal Articles

Twin helical undulator beamline for soft X-ray spectroscopy at SPring-8

Saito, Yuji; Nakatani, Takeshi*; Matsushita, T.*; Miyahara, Tsuneaki*; Fujisawa, M.*; *; *; *; *; *; et al.

Journal of Synchrotron Radiation, 5, p.542 - 544, 1998/00

 Times Cited Count:62 Percentile:94.49(Instruments & Instrumentation)

no abstracts in English

22 (Records 1-20 displayed on this page)