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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：60.94(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.

Journal Articles

Low-energy spin fluctuations in the ground states of electron-doped Pr$$_{1-x}$$LaCe$$_x$$CuO$$_{4+delta}$$ cuprate superconductors

Fujita, Masaki*; Matsuda, Masaaki; Lee, S.-H.*; Nakagawa, Masaaki*; Yamada, Kazuyoshi*

Physical Review Letters, 101(10), p.107003_1 - 107003_4, 2008/09

https://doi.org/10.1103/PhysRevLett.101.107003
 Times Cited Count：38 Percentile：81.16(Physics, Multidisciplinary)

Low-energy spin fluctuations have been investigated in the electron-doped Pr$$_{1-x}$$LaCe$$_x$$CuO$$_{4+delta}$$ over a wide concentration range of 0.07$$< x <$$0.18, spanning from the antiferromagnetic phase to the heavily overdoped superconducting (SC) phase. The low-energy excitations exhibit commensurate peaks centered at the ($$pi$$, $$pi$$) position for all $$x$$. Our data show that the characteristics of the excitations, such as the relaxation rate and the spin stiffness, decrease with increasing $$x$$ in the SC phase and disappear with the disappearance of superconductivity.

Oral presentation

Development of design technology on carryover from free-surface in the upper plenum of natural-circulation type BWRs, 1; Master plan and outline of experiments for the development of mechanistic models

Onuki, Akira; Nakagawa, Masaki*; Nagayoshi, Takuji*; Tamai, Hidesada; Katono, Kenichi*

no journal, , 

no abstracts in English

Oral presentation

Development of design technology on carryover from free-surface in the upper plenum of natural-circulation type BWRs, 2; Measurement of void fraction under free-surface

Nagayoshi, Takuji*; Tamai, Hidesada; Katono, Kenichi*; Nakagawa, Masaki*; Onuki, Akira

no journal, , 

no abstracts in English

Oral presentation

Development of design technology on carryover from free-surface in the upper plenum of natural-circulation type BWRs, 3; Measurement of droplet diameter/velocity distributions

Tamai, Hidesada; Nagayoshi, Takuji*; Katono, Kenichi*; Nakagawa, Masaki*; Onuki, Akira

no journal, , 

no abstracts in English

Oral presentation

Development of design technology on carryover from free-surface in the upper plenum of natural-circulation type BWRs, 4; Evaluation of flow rate of carryover based on measurements of droplet diameter and droplet velocity

Tamai, Hidesada; Nagayoshi, Takuji; Katono, Kenichi; Nakagawa, Masaki; Onuki, Akira

no journal, , 

no abstracts in English

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