462 citations · 5.5k across the 78 of their papers we have counts for
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Spin current and chirality degrees of freedom inherent in localized electron orbitals
Shintaro Hoshino, Michi-To Suzuki, Hiroaki Ikeda
In solid state physics, any phase transition is commonly observed as a change in the microscopic distribution of charge, spin, or current. Here we report the nature of an exotic or…
First-principles theory of magnetic multipoles in condensed matter systems
Michi-To Suzuki, Hiroaki Ikeda, Peter M. Oppeneer
The multipole concept, which characterizes the spacial distribution of scalar and vector objects by their angular dependence, has already become widely used in various areas of phy…
First-principles study of magnetic properties in Fe-ladder compound BaFe2S3
Michi-To Suzuki, Ryotaro Arita, Hiroaki Ikeda
We study the magnetic, structural, and electronic properties of the recently discovered iron- based superconductor BaFe2S3 based on density functional theory with the generalized g…
Emergent loop-nodal s-wave superconductivity in CeCuSi: similarities to the iron-based superconductors
Hiroaki Ikeda, Michi-To Suzuki, Ryotaro Arita
Heavy-fermion superconductors are prime candidates for novel electron-pairing states due to the spin-orbital coupled degrees of freedom and electron correlations. Superconductivity…
Emergence of Orbital Nematicity in the Tetragonal Phase of BaFe(AsP)
Tetsuya Iye, Marc-Henri Julien, Hadrien Mayaffre +7
We report on As-NMR measurements in single crystalline BaFe(AsP) for magnetic fields parallel to the orthorhombic and $[100]_{\…
Broken symmetries in URu2Si2
T. Shibauchi, H. Ikeda, Y. Matsuda
To resolve the nature of the hidden order below 17.5\,K in the heavy fermion compound URuSi, identifying which symmetries are broken below the hidden order transition is on…
Cyclotron resonance study of quasiparticle mass and scattering rate in the hidden-order and superconducting phases of URu2Si2
S. Tonegawa, K. Hashimoto, K. Ikada +10
The observation of cyclotron resonance in ultra-clean crystals of URu2Si2 [S. Tonegawa et al., PRL 109, 036401 (2012)] provides another route besides quantum oscillations to the de…
Cyclotron Resonance in the Hidden-Order Phase of URu2Si2
S. Tonegawa, K. Hashimoto, K. Ikada +9
We report the first observation of cyclotron resonance in the hidden-order phase of ultra-clean URuSi crystals, which allows the full determination of angle-dependent elect…
Emergent Rank-5 'Nematic' Order in URu2Si2
H. Ikeda, M. -T. Suzuki, R. Arita +3
Novel electronic states resulting from entangled spin and orbital degrees of freedom are hallmarks of strongly correlated f-electron systems. A spectacular example is the so-called…
Metamagnetic Behavior and Kondo Breakdown in Heavy-Fermion CeFePO
S. Kitagawa, H. Ikeda, Y. Nakai +5
We report that nonmagnetic heavy-fermion (HF) iron oxypnictide CeFePO with two-dimensional XY-type anisotropy shows a metamagnetic behavior at the metamagnetic field H_M \simeq 4 T…
Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
R. Okazaki, T. Shibauchi, H. J. Shi +6
A second-order phase transition is characterized by spontaneous symmetry breaking. The nature of the broken symmetry in the so-called "hidden order" phase transition in the heavy f…
Fourth Order Perturbation Theory for Normal Selfenergy in Repulsive Hubbard Model
Shogo Shinkai, Hiroaki Ikeda, Kosaku Yamada
We investigate the normal selfenergy and the mass enhancement factor in the Hubbard model on the two-dimensional square lattice. Our purpose in this paper is to evaluate the mass e…
Interplay of crystal field structures with configuration to heavy fermions
Hiroaki Kusunose, Hiroaki Ikeda
We examine a relevance between characteristic of crystal field structures and heavily renormalized quasiparticle states in the -- Anderson lattice model. Using a sla…
Theory of Superconductivity in Strongly Correlated Electron Systems
Yoichi Yanase, Takanobu Jujo, Takuji Nomura +3
In this article we review essential natures of superconductivity in strongly correlated electron systems (SCES) from a universal point of view. After summarizing experimental resul…
Role of Vertex Correction and Dimensionality on Superconductivity Induced by On-site Coulomb Repuls ion
Hirono Fukazawa, Hiroaki Ikeda, Kosaku Yamada
We evaluate the dominant superconducting pairing symmetry in some 3-dimensional cubic lattice struct ures within the third-order perturbation theory with respect to the on-site cou…
Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_{x}Co_{1-x}In_5
Yunori Nisikawa, Hiroaki Ikeda, Kosaku Yamada
We reformulate the Eliashberg's equation for the superconducting transition within the quasi-particle description, which takes account of the heavy electron mass. We discuss the su…
Reply to the Comment by Kiselev and Bouis
Hiroaki Ikeda, Yoji Ohashi
The possibility of the ferromagnetic state modifies the phase diagram in Phys.Rev.Lett.81,3723(1998), as Kiselev and Bouis have pointed out. However, the unconventional SDW that ha…
Theory of Unconventional Spin Density Wave: A Possible Mechanism of the Micromagnetism in U-based Heavy Fermion Compounds
Hiroaki Ikeda, Yoji Ohashi
We propose a novel spin density wave (SDW) state as a possible mechanism of the anomalous antiferromagnetism, so-called the micromagnetism, in URu_2Si_2 below 17.5[K]. In this new…