Publications (10)
Enhanced ferromagnetic transition temperature induced by a microscopic structural rearrangement in the diluted magnetic semiconductor GeMnTe
M. Kriener, T. Nakajima, Y. Kaneko +7
The correlation between magnetic properties and microscopic structural aspects in the diluted magnetic semiconductor GeMnTe is investigated by x-ray diffraction and m…
Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb
H. Sakai, H. Fujimura, S. Sakuragi +16
Unconventional features of relativistic Dirac/Weyl quasi-particles in topological materials are most evidently manifested in the 2D quantum Hall effect (QHE), whose variety is furt…
S=1/2 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6
A. S. Gibbs, A. Yamamoto, A. N. Yaresko +10
The ordered hexagonal perovskite Ba2CuTeO6 hosts weakly coupled S=1/2 spin ladders produced by an orbital ordering of Cu2+. The magnetic susceptibility chi(T) of Ba2CuTeO6 is well…
Field-induced multiple metal-insulator crossovers of correlated Dirac electrons of perovskite CaIrO
R. Yamada, J. Fujioka, M. Kawamura +10
The interplay between electron correlation and topology of relativistic electrons may lead to a new stage of the research on quantum materials and emergent functions. The emergence…
Metal-insulator transition and superconductivity induced by Rh doping in binary Ru Pnictides RuPn (Pn = P, As and Sb)
D. Hirai, T. Takayama, D. Hashizume +1
Binary ruthenium pnictides, RuP and RuAs, with an orthorhombic MnP structure, were found to show a metal to a non-magnetic insulator transition at TMI = 270 K and 200 K, respective…
Critical enhancement of thermopower in a chemically tuned polar semimetal MoTe
H. Sakai, K. Ikeura, M. S. Bahramy +5
Ferroelectrics with spontaneous electric polarization play an essential role in today's device engineering, such as capacitors and memories. Their physical properties are further e…
Superconductivity at 6 K and the violation of Pauli limit in Ta2PdxS5
Y. F. Lu, T. Takayama, A. F. Bangura +3
Ta2PdxS5 (x < 1.0) was found to show superconductivity at Tc ~ 6 K. The temperature dependent resistivity of single crystalline Ta2Pd0.92S5 showed that the system is strongly disor…
Doping-induced topological transition and enhancement of thermopower in the Dirac-semimetal system CdZnAs
J. Fujioka, M. Kriener, D. Hashizume +3
CdAs is one of the prototypical topological Dirac semimetals. Here, we manipulate the band inversion responsible for the emergence of Dirac nodes by alloying CdAs w…
Anomalous metallic state in the vicinity of Metal to Valence Bond Solid insulator transition in LiVS2
N. Katayama, M. Uchida, D. Hashizume +9
We investigate LiVS2 and LiVSe2 with a triangular lattice as itinerant analogues of LiVO2, known for the formation of valence bond solid (VBS) state out of S = 1 frustrated magnet.…
Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials
H. Takagi, R. Takagi, S. Minami +14
In ferromagnets, electric current generally induces transverse Hall voltage in proportion to magnetization (anomalous Hall effect), and it is frequently used for electrical readout…