Zobrazeno 1 - 10
of 166
pro vyhledávání: '"Kotegawa, Hisashi"'
Large Anomalous Hall Conductivity Derived from an $f$-Electron Collinear Antiferromagnetic Structure
Autor:
Kotegawa, Hisashi, Tanaka, Hiroto, Takeuchi, Yuta, Tou, Hideki, Sugawara, Hitoshi, Hayashi, Junichi, Takeda, Keiki
Publikováno v:
Phys. Rev. Lett. 133, 106301 (2024)
Appropriate symmetry breaking generates an anomalous Hall (AH) effect, even in antiferromagnetic (AFM) materials. Itinerant magnets with $d$ electrons are typical examples that show a significant response. By contrast, the process by which a response
Externí odkaz:
http://arxiv.org/abs/2409.04071
Autor:
Kotegawa, Hisashi, Nakamura, Akira, Huyen, Vu Thi Ngoc, Arai, Yuki, Tou, Hideki, Sugawara, Hitoshi, Hayashi, Junichi, Takeda, Keiki, Tabata, Chihiro, Kaneko, Koji, Kodama, Katsuaki, Suzuki, Michi-To
Antiferromagnets without parity-time ($\mathcal{PT}$) symmetry offer novel perspectives in the field of functional magnetic materials. Among them, those with ferromagnetic-like responses are promising candidates for future applications such as antife
Externí odkaz:
http://arxiv.org/abs/2409.04064
Autor:
Arai, Yuki, Hayashi, Junichi, Takeda, Keiki, Tou, Hideki, Sugawara, Hitoshi, Kotegawa, Hisashi
The large anomalous Hall effect (AHE) in antiferromagnetic (AF) materials arises from symmetry breaking equivalent to a ferromagnetic (FM) state. Consequently, this suggests that the observed AHE is induced by the intrinsic mechanism of the band stru
Externí odkaz:
http://arxiv.org/abs/2403.05058
Autor:
Manago, Masahiro, Ishigaki, Ayano, Tou, Hideki, Harima, Hisatomo, Tanida, Hiroshi, Kotegawa, Hisashi
Publikováno v:
Phys. Rev. B 108, 085118 (2023)
A nonmagnetic phase transition at $T_0 \sim 12$ K in the tetragonal system CeCoSi with a Kramers doublet ground state is reminiscent of an electric quadrupole ordering, even though its well-separated crystal-electric-field (CEF) levels are unlikely t
Externí odkaz:
http://arxiv.org/abs/2308.09253
Autor:
Kotegawa, Hisashi, Kuwata, Yoshiki, Huyen, Vu Thi Ngoc, Arai, Yuki, Tou, Hideki, Matsuda, Masaaki, Takeda, Keiki, Sugawara, Hitoshi, Suzuki, Michi-To
Publikováno v:
npj Quantum Materials 8, 56 (2023)
Specific antiferromagnetic (AF) spin configurations generate large anomalous Hall effects (AHEs) even at zero magnetic field through nonvanishing Berry curvature in momentum space. In addition to restrictions on AF structures, suitable control of AF
Externí odkaz:
http://arxiv.org/abs/2305.02028
Autor:
Nagase, Yuya, Manago, Masahiro, Hayashi, Junichi, Takeda, Keiki, Tou, Hideki, Matsuoka, Eiichi, Sugawara, Hitoshi, Harima, Hisatomo, Kotegawa, Hisashi
Publikováno v:
Phys. Rev. B 107, 104512 (2023)
We present synthesis and $^{75}$As-nuclear quadrupole resonance (NQR) measurements for the noncentrosymmetric superconductor CaPtAs with a superconducting transition temperature $T_c$ of $\sim 1.5$ K. We discovered two different forms of CaPtAs durin
Externí odkaz:
http://arxiv.org/abs/2303.14339
Publikováno v:
Phys. Rev. B 106, L180405 (2022)
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 how the FM state terminates at a quantum phase transition, we measured
Externí odkaz:
http://arxiv.org/abs/2211.13401
Publikováno v:
Journal of the Physical Society of Japan, 90, 023702 (2021)
We performed $^{59}$Co nuclear magnetic and quadrupole resonance (NMR and NQR) measurements under pressure on a single-crystalline CeCoSi, which undergoes an unresolved phase transition at $T_0$. The NQR spectra clearly showed that the phase transiti
Externí odkaz:
http://arxiv.org/abs/2101.06830
Autor:
Kuwata, Yoshiki, Kotegawa, Hisashi, Tou, Hideki, Harima, Hisatomo, Ding, Qing-Ping, Takeda, Keiki, Hayashi, Junichi, Matsuoka, Eiichi, Sugawara, Hitoshi, Sakurai, Takahiro, Ohta, Hitoshi, Furukawa, Yuji
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 susceptibility, and nuclear magnetic resonance measurements using the crystals
Externí odkaz:
http://arxiv.org/abs/2011.03229
Autor:
Matsushima, Kei, Kotegawa, Hisashi, Kuwata, Yoshiki, Tou, Hideki, Kaneyoshi, Jun, Matsuoka, Eiichi, Sugawara, Hitoshi, Sakurai, Takahiro, Ohta, Hitoshi, Harima, Hisatomo
Publikováno v:
Phys. Rev. B 100, 100501(R) (2019)
We report $^{75}$As-NMR results for CrAs under pressure, which shows superconductivity adjoining a helimagnetically ordered state. We successfully evaluated the Knight shift from the spectrum, which is strongly affected by the quadrupole interaction.
Externí odkaz:
http://arxiv.org/abs/1909.13416