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Journal Articles

Two-step Mott transition in Ni(S,Se)$$_2$$; $$mu$$SR studies and charge-spin percolation model

Sheng, Q.*; Kaneko, Tatsuya*; Yamakawa, Kohtaro*; Guguchia, Z.*; Gong, Z.*; Zhao, G.*; Dai, G.*; Jin, C.*; Guo, S.*; Fu, L.*; et al.

Physical Review Research (Internet), 4(3), p.033172_1 - 033172_14, 2022/09

https://doi.org/10.1103/PhysRevResearch.4.033172

Journal Articles

Multipole polaron in the devil's staircase of CeSb

Arai, Yosuke*; Kuroda, Kenta*; Nomoto, Takuya*; Tin, Z. H.*; Sakuragi, Shunsuke*; Bareille, C.*; Akebi, Shuntaro*; Kurokawa, Kifu*; Kinoshita, Yuto*; Zhang, W.-L.*; et al.

Nature Materials, 21(4), p.410 - 415, 2022/04

https://doi.org/10.1038/s41563-021-01188-9
 Times Cited Count：12 Percentile：78.70(Chemistry, Physical)

Journal Articles

Effect of magnetism on lattice dynamics in SrFe$$_2$$As$$_2$$ using high-resolution inelastic X-ray scattering

Murai, Naoki*; Fukuda, Tatsuo; Kobayashi, Tatsuya*; Nakajima, Masamichi*; Uchiyama, Hiroshi*; Ishikawa, Daisuke*; Tsutsui, Satoshi*; Nakamura, Hiroki; Machida, Masahiko; Miyasaka, Shigeki*; et al.

Physical Review B, 93(2), p.020301_1 - 020301_5, 2016/01

https://doi.org/10.1103/PhysRevB.93.020301
 Times Cited Count：7 Percentile：32.27(Materials Science, Multidisciplinary)

Journal Articles

Magnetic phase diagrams of YVO$$_{3}$$ and TbVO$$_{3}$$ under high pressure

Bizen, Daisuke*; Nakao, Hironori*; Iwasa, Kazuaki*; Murakami, Yoichi*; Osakabe, Toyotaka; Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Tokura, Yoshinori*

Journal of the Physical Society of Japan, 81(2), p.024715_1 - 024715_6, 2012/02

https://doi.org/10.1143/JPSJ.81.024715
 Times Cited Count：7 Percentile：45.79(Physics, Multidisciplinary)

The magnetic phase diagrams for $$R$$VO$$_{3}$$ ($$R$$ = Y, Tb) were determined by low temperature and high pressure neutron-diffraction techniques. We found that the magnetic ground state in TbVO$$_{3}$$ changes from ${it C}$-type spin ordering (${it C}$-SO) to ${it G}$-type spin ordering (${it G}$-SO) on application of pressure. The transition of the magnetic ground state also indicates that the ground state of the orbital ordering changes from ${it G}$-type orbital ordering (${it G}$-OO) to ${it C}$-type orbital ordering (${it C}$-OO). In YVO$$_{3}$$, the ${it G}$-SO and ${it C}$-OO phases set in simultaneously up to 6.2 GPa, and the disorder-[${it G}$-SO, ${it C}$-OO] phase transition appears above 6 GPa. This is the first observation of a simultaneous spin and orbital order-disorder phase transition in perovskite-type transition-metal oxides $$R$$MO$$_{3}$$. The [${it G}$-SO, ${it C}$-OO] phase is strongly stabilized with increasing pressure, and both the covalency effect and the superexchange interaction play roles in this stabilization.

Journal Articles

Thermoelectric response in the incoherent transport region near Mott transition; The Case study of La$$_{1-x}$$Sr$$_x$$VO$$_3$$

Uchida, Masaki*; Oishi, Koji*; Matsuo, Mari; Koshibae, Wataru*; Onose, Yoshinori*; Mori, Michiyasu; Fujioka, Jun*; Miyasaka, Shigeki*; Maekawa, Sadamichi; Tokura, Yoshinori*

Physical Review B, 83(16), p.165127_1 - 165127_5, 2011/04

https://doi.org/10.1103/PhysRevB.83.165127
 Times Cited Count：31 Percentile：74.46(Materials Science, Multidisciplinary)

Journal Articles

Critical competition between two distinct orbital-spin ordered states in perovskite vanadates

Fujioka, Jun*; Yasue, Toshio*; Miyasaka, Shigeki*; Yamazaki, Yuichi*; Arima, Takahisa*; Sagayama, Hajime*; Inami, Toshiya; Ishii, Kenji; Tokura, Yoshinori*

Physical Review B, 82(14), p.144425_1 - 144425_12, 2010/10

https://doi.org/10.1103/PhysRevB.82.144425
 Times Cited Count：54 Percentile：85.54(Materials Science, Multidisciplinary)

Journal Articles

Magnetic-field-induced transition in the lattice modulation of colossal magnetoelectric GdMnO$$_3$$ and TbMnO$$_3$$ compounds

Arima, Takahisa*; Goto, Tsuyoshi*; Yamazaki, Yuichi*; Miyasaka, Shigeki*; Ishii, Kenji; Tsubota, Masami; Inami, Toshiya; Murakami, Yoichi*; Tokura, Yoshinori*

Physical Review B, 72(10), p.100102_1 - 100102_4, 2005/09

https://doi.org/10.1103/PhysRevB.72.100102
 Times Cited Count：132 Percentile：95.47(Materials Science, Multidisciplinary)

Single-crystal synchrotron X-ray diffraction measurements in strong magnetic fields have been performed for magnetoelectric compounds GdMnO$$_3$$ and TbMnO$$_3$$. It has been found that the ${bf P}$//a ferroelectric phase induced by the application of a magnetic field at low temperatures is characterized by commensurate lattice modulation along the orthorhombic ${it b}$ axis with q=1/2 and q=1/4. The lattice modulation is ascribed to antiferromagnetic spin alignment with a modulation vector of (0 1/4 1). The change of the spin structure is directly correlated with the magnetic-field-induced electric phase transition, because any commensurate spin modulation with (0 1/4 1) should break glide planes normal to the ${it a}$ axis of the distorted perovskite with the space group.

Oral presentation

Magneto-elastic coupling in detwinned Sr(Fe$$_{1-x}$$Co$$_x$$)$$_2$$As$$_2$$ by inelastic X-ray scattering

Murai, Naoki*; Fukuda, Tatsuo; Nakajima, Masamichi*; Kobayashi, Tatsuya*; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Ishikawa, Daisuke*; Nakamura, Hiroki; Machida, Masahiko; Miyasaka, Shigeki*; et al.

no journal, , 

Oral presentation

RIXS of Y1-xCaxVO$$_{3}$$

Ikeuchi, Kazuhiko; Yoshida, Masahiro; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of magnetism on phonon dispersion of SrFe$$_2$$As$$_2$$ via inelastic X-ray scattering

Murai, Naoki*; Fukuda, Tatsuo; Uchiyama, Hiroshi*; Tsutsui, Satoshi*; Ishikawa, Daisuke*; Kobayashi, Tatsuya*; Nakamura, Hiroki; Machida, Masahiko; Nakajima, Masamichi*; Miyasaka, Shigeki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effect of magnetism on lattice dynamics of SrFe$$_{2}$$As$$_{2}$$ via high-resolution inelastic X-ray scattering

Murai, Naoki; Fukuda, Tatsuo; Kobayashi, Tatsuya*; Nakajima, Masamichi*; Uchiyama, Hiroshi*; Ishikawa, Daisuke*; Tsutsui, Satoshi*; Nakamura, Hiroki; Machida, Masahiko; Miyasaka, Shigeki*; et al.

no journal, , 

We report the first IXS study of single crystals of SrFe$$_{2}$$As$$_{2}$$ that have been detwinned via application of in-plane uniaxial stress. Our results clearly show anisotropy in phonon structure below $$it T_{s}$$ = $$it T_{N}$$ characterized by mode splitting at tetragonally-equivalent momentum transfers. To the best of our knowledge, this is the first observation of phonon anisotropy in iron-pnictides at finite momentum transfers. We obtain good agreement with our results using calculations that are modified to account for a reduced magnetic moment and fluctuating magnetism. Previous efforts using either non-magnetic calculations or static magnetism tend to either get the dispersion wrong from non-magnetic calculations or strongly over-estimate the phonon mode splitting when static magnetism is included. Our model for the response below $$it T_{N}$$ incorporates a phenomenological reduction in force constant anisotropy, by about 65%, that can be attributed to residual fast magnetic fluctuations. Above $$it T_{N}$$, all fluctuations are assumed to be fast and the response becomes the average of the results from the static magnetism. This serves as a starting point for a general model of phonons in iron-pnictides applicable to both non-magnetic and magnetic phases.

Oral presentation

Resonent inelastic X-ray scattering study of the orbital ordering vanadate

Ikeuchi, Kazuhiko; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

Oral presentation

Vibronic bound states in anti-ferromagnet CeAs observed by ARPES, inelastic X-ray scattering spectroscopy, and laser Raman scattering spectroscopy

Arai, Yosuke*; Kuroda, Kenta*; Tsutsui, Satoshi*; Hirai, Daigoro*; Katayama, N.*; Nomoto, Takuya*; Shin, S.*; Kubota, Masato; Haga, Yoshinori; Suzuki, Hiroyuki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Resonant inelastic X-ray scattering study of YVO$$_{3}$$, 2

Sato, Tomohiro*; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

Oral presentation

Study of crystal field-phonon binding in CeAs by inelastic X-ray scattering

Arai, Yosuke*; Kuroda, Kenta*; Tsutsui, Satoshi*; Hirai, Daigoro*; Katayama, Wago*; Shin, S.*; Kubota, Masato; Nomoto, Takuya*; Suzuki, Hiroyuki*; Miyasaka, Shigeki*; et al.

no journal, , 

no abstracts in English

Oral presentation

Temperature dependence of the electronic structure in low-carrier semi-metal CeAs revealed by angle-resolved photoemission spectroscopy

Arai, Yosuke*; Kuroda, Kenta*; Nomoto, Takuya*; Hirai, Daigoro*; Katayama, Wago*; Tsutsui, Satoshi*; Tanaka, Hiroaki*; Arita, Masashi*; Shin, S.*; Kubota, Masato; et al.

no journal, , 

no abstracts in English

Oral presentation

Resonant inelastic X-ray scattering study of YVO$$_3$$

Ikeuchi, Kazuhiko; Sato, Tomohiro; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi; Miyasaka, Shigeki*; Fujioka, Jun*; Tokura, Yoshinori*

no journal, , 

I will present resonant inelastic X-ray scattering measurements of the electric excitations in YVO $$_3$$ with the incident energy of the K edge of vanadium at room temperature. We observed excitations corresponding to a Mott gap. We also performed the measurements of polarization dependence of the excitations. Remarkable change was observed on the Mott excitations about the measurements above the T $$_c$$ of the orbital order.

Oral presentation

Charge dynamics in YVO$$_{3}$$ investigated by resonant inelastic X-ray scattering

Ikeuchi, Kazuhiko; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; Tokura, Yoshinori*

no journal, , 

Oral presentation

Charge excitations in the orbital ordering YVO$$_{3}$$ investigated by resonant inelastic scattering

Ikeuchi, Kazuhiko; Sato, Tomohiro*; Jarrige, I.; Ishii, Kenji; Inami, Toshiya; Mizuki, Junichiro; Bizen, Daisuke*; Murakami, Yoichi*; Miyasaka, Shigeki*; Fujioka, Jun*; et al.

no journal, , 

Oral presentation

Magnetic phase transition of TbVO$$_{3}$$ observed under high pressure

Bizen, Daisuke*; Nakao, Hironori*; Iwasa, Kazuaki*; Murakami, Yoichi*; Osakabe, Toyotaka; Miyasaka, Shigeki*; Tokura, Yoshinori*

no journal, , 

no abstracts in English

20 (Records 1-20 displayed on this page)
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