143 citations · 537 across the 19 of their papers we have counts for
19 papers
Superconductivity in a ferroelectric-like topological semimetal SrAuBi
Hidefumi Takahashi, Tomohiro Sasaki, Akitoshi Nakano +6
Given the rarity of metallic systems that exhibit ferroelectric-like transitions, it is apparently challenging to find a system that simultaneously possesses superconductivity and…
Unveiling the orbital-selective electronic band reconstruction through the structural phase transition in TaTe
Natsuki Mitsuishi, Yusuke Sugita, Tomoki Akiba +8
Tantalum ditelluride TaTe belongs to the family of layered transition metal dichalcogenides but exhibits a unique structural phase transition at around 170 K that accompanies t…
Ultrafast Control of Crystal Structure in a Topological Charge-Density-Wave Material
Takeshi Suzuki, Yuya Kubota, Natsuki Mitsuishi +15
Optical control of crystal structures is a promising route to change physical properties including topological nature of a targeting material. Time-resolved X-ray diffraction measu…
Superconductivity in a Magnetic Rashba Semimetal EuAuBi
Hidefumi Takahashi, Kazuto Akiba, Masayuki Takahashi +4
We report the observation of superconductivity with multiple magnetic ordering and Rashba-type spin-orbit coupling in a layered polar semimetal EuAuBi. Magnetic transition is obser…
Possible helimagnetic order in Co4+-containing perovskites Sr1-xCaxCoO3
Hidefumi Takahashi, Masaho Onose, Yasuhito Kobayashi +7
We systematically synthesized perovskite-type oxides Sr1-xCaxCoO3 containing unusually high valence Co4+ ions by a high pressure technique, and investigated the effect of systemati…
Spin-charge coupling and decoupling in perovskite-type iron oxides (SrBa)LaFeO
Masaho Onose, Hidefumi Takahashi, Takashi Saito +10
The perovskite-type iron oxide SrLaFeO is known to show characteristic spin-charge ordering (SCO), where sixfold collinear spin ordering and threefold charge or…
Spin-orbit-derived giant magnetoresistance in a layered magnetic semiconductor AgCrSe2
Hidefumi Takahashi, Tomoki Akiba, Alex Hiro Mayo +6
Two-dimensional magnetic materials have recently attracted great interest due to their unique functions as the electric field control of a magnetic phase and the anomalous spin Hal…
High-Pressure Synthesis of a Massive and Non-Symmorphic Dirac Semimetal Candidate MoP
Alex Hiro Mayo, Jon Alexander Richards, Hidefumi Takahashi +1
Single crystal and polycrystalline samples of MoP with a black-phosphorus-derived structure have been successfully synthesized by a high-pressure technique. The polycrystalline…
Magnetic generation and switching of topological quantum phases in a trivial semimetal
Alex Hiro Mayo, Hidefumi Takahashi, Mohammad Saeed Bahramy +3
Topological materials have drawn increasing attention owing to their rich quantum properties, as highlighted by a large intrinsic anomalous Hall effect (AHE) in Weyl and nodal-line…
Competing spin modulations in a magnetically frustrated semimetal EuCuSb
Hidefumi Takahashi, Kai Aono, Yusuke Nambu +6
The competing magnetic ground states of the itinerant magnet EuCuSb, which has a hexagonal layered structure, were studied via magnetization, resistivity, and neutron diffraction m…
Switching of band inversion and topological surface states by charge density wave
N. Mitsuishi, Y. Sugita, M. S. Bahramy +14
Topologically nontrivial materials host protected edge states associated with the bulk band inversion through the bulk-edge correspondence. Manipulating such edge states is highly…
Giant enhancement of cryogenic thermopower by polar structural instability in the pressurized semimetal MoTe2
Hidefumi Takahashi, Kento Hasegawa, Tomoki Akiba +3
We found that a high mobility semimetal 1T'-MoTe2 shows a significant pressure-dependent change in the cryogenic thermopower in the vicinity of the critical pressure, where the pol…
Impact of antiferromagnetic order on Landau level splitting of quasi-two-dimensional Dirac fermions in EuMnBi
H. Masuda, H. Sakai, M. Tokunaga +7
We report spin-split Landau levels of quasi-two-dimensional Dirac fermions in a layered antiferromagnet EuMnBi, as revealed by interlayer resistivity measurements in a tilted m…
Enhanced thermopower via spin-state modification
Hidefumi Takahashi, Shintaro Ishiwata, Ryuji Okazaki +2
We investigated the effect of pressure on the magnetic and thermoelectric properties of SrYCoO. The magnetization is reduced with the application of…
Anticorrelation between polar lattice instability and superconductivity in the Weyl semimetal candidate MoTe2
H. Takahashi, T. Akiba, K. Imura +6
The relation between the polar structural instability and superconductivity in a Weyl semimetal candidate MoTe2 has been clarified by finely controlled physical and chemical pressu…
Intrinsic effects of substitution and intercalation on thermal transport in two-dimensional TiS single crystals
Ramzy Daou, Hidefumi Takahashi, Sylvie Hébert +3
The promising thermoelectric material TiS can be easily chemically doped and intercalated. We present here studies of single crystals that are intercalated with excess Ti or Co…
Origin of the energy gap in the narrow-gap semiconductor FeSb2 revealed by high-pressure magnetotransport measurements
H. Takahashi, R. Okazaki, I. Terasaki +1
To elucidate an origin of the two energy gaps in the narrow-gap semiconductor FeSb2, we have investigated the effects of hydrostatic pressure on the resistivity, Hall resistance an…
Low-temperature magnetotransport of narrow-gap semiconductor FeSb2
H. Takahashi, R. Okazaki, Y. Yasui +1
We present a study of the magnetoresistance and Hall effect in the narrow-gap semiconductor FeSb2 at low temperatures. Both the electrical and Hall resistivities show unusual magne…
Studies of Impurity-Doping Effects and NMR Measurement5s of La1111 and/or Nd 1111 Fe-Pnictide Superconductors
Masatoshi Sato, Yoshiaki Kobayashi, San Chul Lee +3
Measurements of the electrical resistivities, Hall coefficients, thermoelectric powers, electronic specific heat coefficients have been carried out for samples of LnFe1-yMyAsO1-xFx…