306 citations · 3.1k across the 63 of their papers we have counts for
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Large anomalous Hall effect and unusual domain switching in an orthorhombic antiferromagnetic material NbMnP
Hisashi Kotegawa, Yoshiki Kuwata, Vu Thi Ngoc Huyen +6
Specific antiferromagnetic (AF) spin configurations generate large anomalous Hall effects (AHEs) even at zero magnetic field through nonvanishing Berry curvature in momentum space.…
Avoided ferromagnetic quantum critical point in CeZn
Hisashi Kotegawa, Toshiaki Uga, Hideki Tou +2
Cubic CeZn shows a structural phase transition under pressure, and it modifies the ground state from an antiferromagnetic (AFM) state to a ferromagnetic (FM) state. To investigate…
CeFeAl: a Correlated Metal with a Fermi Surface Exhibiting Nonmetallic Conduction
Taichi Terashima, Hishiro T. Hirose, Naoki Kikugawa +3
Metals can be defined as materials with a Fermi surface or as materials exhibiting metallic conduction (i.e., ). Usually, these definitions both hold…
Isotropic parallel antiferromagnetism in the magnetic-field-induced charge-ordered state of SmRuP caused by - hybridization
T. Matsumura, S. Michimura, T. Inami +12
Nature of the field-induced charge ordered phase (phase II) of SmRuP has been investigated by resonant x-ray diffraction (RXD) and polarized neutron diffraction (PND), f…
First-order phase transition to a nonmagnetic ground state in nonsymmorphic NbCrP
Yoshiki Kuwata, Hisashi Kotegawa, Hideki Tou +9
We report the discovery of a first-order phase transition at around 125 K in NbCrP, which is a nonsymmorphic crystal with Pnma space group. From the resistivity, magnetic susceptib…
Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in MnP
H. Kotegawa, M. Matsuda, F. Ye +13
Antiferromagnet MnP with Neel temperature K is composed of Mn-tetrahedrons and zigzag chains formed by three inequivalent Mn sites. Due to the nearly frustrated lattic…
Optical and photoelectrical studies on anisotropic metal-insulator transition of RuAs
Yuki Nakajima, Zenjiro Mita, Hiroshi Watanabe +6
The anisotropic changes in the electronic structure of a metal-to-insulator transition (MIT) material, RuAs, with two-step phase transition are reported by using polarized optical…
Indication of Ferromagnetic Quantum Critical Point in Kondo Lattice CeRhGe
Hisashi Kotegawa, Eiichi Matsuoka, Toshiaki Uga +6
We report resistivity measurements under pressure for Kondo-lattice ferromagnet CeRhGe, and present that a quantum ferromagnetic (FM) phase transition is easily achieved. I…
Superlattice formation lifting degeneracy protected by non-symmorphic symmetry through a metal-insulator transition in RuAs
Hisashi Kotegawa, Keiki Takeda, Yoshiki Kuwata +6
The single crystal of RuAs obtained by Bi-flux method shows obvious successive metal-insulator transitions at T_MI1~255 K and T_MI2~195$ K. The X-ray diffraction measurement reveal…
Atomic displacements and lattice distortion in the magnetic-field-induced charge ordered state of SmRuP
T. Matsumura, S. Michimura, T. Inami +5
Structural properties of SmRuP in the anomalous magnetic ordered phase between K and K in magnetic fields has been studied by x-ray dif…
Phase diagram of CeRuPO under pressure investigated by P-NMR - Comparison between CeRuPO under pressure and the Ce(RuFe)PO system -
Shunsaku Kitagawa, Hisashi Kotegawa, Hideki Tou +3
We have performed P-NMR measurements on single-crystalline CeRuPO under pressure in order to understand the variation in magnetic character against pressure. The NMR spectra…
Pressure-Temperature-Magnetic Field Phase Diagram of Ferromagnetic Kondo Lattice CeRuPO
H. Kotegawa, T. Toyama, S. Kitagawa +4
We report the temperature-pressure-magnetic field phase diagram made from electrical resistivity measurements for the ferromagnetic (FM) Kondo lattice CeRuPO. The ground state at z…
f-Electron-Nuclear Hyperfine-Coupled Multiplets in the Unconventional Charge Order Phase of Filled Skutterudite PrRu4P12
Yuji Aoki, Takahiro Namiki, Shanta R. Saha +6
In the unconventional f-electron-associated charge order phase of filled skutterudite PrRu4P12, the low-temperature behaviors of the triplet crystalline-electric-field ground state…
Two-Dimensional Spin Dynamics in the Itinerant Ferromagnet LaCoPO Revealed by Magnetization and P-NMR Measurements
Hitoshi Sugawara, Kenji Ishida, Yusuke Nakai +5
We have performed magnetization and P-NMR measurements on the itinerant ferromagnet LaCoPO (Curie temperature K) with a layered structure in order to…
Anomalous properties in the low-carrier ordered phase of PrRu4P12: Consequence of hybridization between conduction and Pr 4f electrons
S. R. Saha, H. Sugawara, T. Namiki +2
The low-carrier ordered phase below the metal-non-metal transition temperature T_MI ~ 63 K of PrRu4P12 is explored by probing magnetoresistance, magnetic susceptibility, thermoelec…
Anomalous Anisotropic Magnetoresistance in Heavy-Fermion PrFe4P12
H. Sugawara, E. Kuramochi, T. Namiki +3
We have investigated the anisotropy of the magnetoresistance in the Pr-based HF compound PrFe4P12. The large anisotropy of effective mass and its strong field dependence have been…
Gap opening with ordering in PrFe4P12 studied by local tunneling spectroscopy
H. Suderow, K. Behnia, I. Guillamon +6
We present measurements of the local tunneling density of states in the low temperature ordered state of PrFe4P12. The temperature dependencies of the Fermi level density of states…
Low-lying excitations at the rare-earth site due to rattling motion in the filled skutterudite LaOs_4Sb_{12} revealed by ^{139}La NMR and ^{121/123}Sb NQR
Yusuke Nakai, Kenji Ishida, Hitoshi Sugawara +2
We report experimental results of nuclear magnetic resonance (NMR) at the La site and nuclear quadrupole resonance (NQR) at the Sb site in the filled skutterudite LaOsSb…
Muon spin relaxation and hyperfine-enhanced 141Pr nuclear spin dynamic in Pr(Os,Ru)4Sb12 and (Pr,La)Os4Sb12
Lei Shu, D. E. MacLaughlin, Y. Aoki +20
Zero- and longitudinal-field muon spin relaxation (MuSR) experiments have been carried out in the alloy series Pr(Os1-xRux)4Sb12 and Pr1-yLayOs4Sb12 to elucidate the anomalous dyna…
Double superconducting transition in the filled skutterudite PrOs4Sb12 and sample characterizations
M. -A. Measson, D. Braithwaite, G. Lapertot +5
A thorough characterization of many samples of the filled skutterudite compound PrOs4Sb12 is provided. We find that the double superconducting transition in the specific heat Tc1~1…
On the Symmetry of Low-Field Ordered Phase of PrFe4P12 : 31P NMR
J. Kikuchi, M. Takigawa, H. Sugawara +1
We have performed 31P nuclear magnetic resonance (NMR) experiments on the filled skutterudite compound PrFe4P12 to investigate the exotic ordered phase at low temperatures and low…
Low-lying optical phonon modes in the filled skutterudite CeRu4Sb12
C. H. Lee, I. Hase, H. Sugawara +2
The phonon dynamics of filled skutterudite CeRu4Sb12 have been studied at room temperature by inelastic neutron scattering. Optical phonons associated with a large vibration of Ce…
Elastic properties of the Non-Fermi liquid metal and the Dense Kondo semiconductor
Yoshiki Nakanishi, Tomoyuki Kumagai, Masafumi Oikawa +4
We have investigated the elastic properties of the Ce-based filled skutterudite antimonides CeRuSb and CeOsSb by means of ultrasonic measurements. CeRu$_{…
Universal scaling in the dynamical conductivity of heavy fermion Ce and Yb compounds
H. Okamura, T. Watanabe, M. Matsunami +9
Dynamical conductivity spectra s(w) have been measured for a diverse range of heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the mid-…