Hiroshi Tanida

Optical investigation of the electronic structure of a ferromagnetic Weyl semimetal CeAlSi

Shin‐ichi Kimura, Yue Pan, Hiroshi Watanabe, Akimitsu Kirikoshi et autres

To investigate electronic states during the ferromagnetic transition in a magnetic Weyl semimetal CeAlSi, we measured temperature-dependent optical conductivity [$σ_1(ω)$] spectra and compared them with DFT+DMFT band calculations. The $σ_1(ω)$ spectrum did not change significantly across the ferromagnetic ordering temperature ($T_C$), suggesting …

Pressure-Induced Interplay between Heavy-Fermion and Mn-Derived Magnetic States in CeMnSi

Sae Nishiyama, Haruka Mima, Jun-ichi Hayashi, Keiki Takeda et autres

We investigated pressure effects on the nontrivial heavy-fermion antiferromagnet CeMnSi by means of electrical resistivity (ρ) and powder X-ray diffraction. With increasing pressure, the antiferromagnetic order of Mn (T N ∼ 240 K at ambient pressure) is rapidly suppressed and disappears at …

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Pressure-induced PT Symmetry Breaking in LaMnSi

Takuya Aoyama, Hikaru Taneoka, Takemi Yamada, Hiroshi Tanida et autres

We investigate the magnetotransport properties of the antiferromagnetic metal LaMnSi, in which the collinear magnetic order breaks both spatial inversion (P) and time-reversal (T) symmetry yet preserves their combined PT symmetry. High pressure is found to suppress this PT-symmetric antiferromagnetic phase, inducing …

Pressure-induced PT Symmetry Breaking in LaMnSi

Takuya Aoyama, Hikaru Taneoka, Takemi Yamada, Hiroshi Tanida et autres

We investigate the magnetotransport properties of the antiferromagnetic metal LaMnSi, in which the collinear magnetic order breaks both spatial inversion (P) and time-reversal (T) symmetry yet preserves their combined PT symmetry. High pressure is found to suppress this PT-symmetric antiferromagnetic phase, inducing …

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Pressure Effects on CeMnSi: Evolution of Ce 4f and Mn 3d Electronic States and Negative Thermal Expansion

Sae Nishiyama, Haruka Mima, Jun-ichi Hayashi, Keiki Takeda et autres

We investigated pressure effects on the nontrivial heavy-fermion antiferromagnet CeMnSi by means of electrical resistivity and powder X-ray diffraction. With increasing pressure, the antiferromagnetic order of Mn (T_N ~ 240 K at ambient pressure) is rapidly suppressed and disappears at P_c ~ …

Pressure Effects on CeMnSi: Evolution of Ce 4f and Mn 3d Electronic States and Negative Thermal Expansion

Sae Nishiyama, Haruka Mima, Jun-ichi Hayashi, Keiki Takeda et autres

We investigated pressure effects on the nontrivial heavy-fermion antiferromagnet CeMnSi by means of electrical resistivity and powder X-ray diffraction. With increasing pressure, the antiferromagnetic order of Mn (T_N ~ 240 K at ambient pressure) is rapidly suppressed and disappears at P_c ~ …

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Microscopic Determination of the c-axis-Oriented Antiferromagnetic Structure in LaMnSi by $^{55}$Mn and $^{139}$La NMR

Yusuke Sakai, Fumiya Hori, Hiroki Matsumura, Shumpei Oguchi et autres

We report a microscopic investigation of the magnetic structure and electronic properties of LaMnSi in its antiferromagnetic (AFM) state using nuclear magnetic resonance (NMR). Field-swept $^{55}$Mn- and $^{139}$La-NMR spectra, as well as zero-field 55Mn-NMR (ZFNMR) spectra, reveal that the Mn ordered moments …

Microscopic Determination of the c -axis-Oriented Antiferromagnetic Structure in LaMnSi by 55 Mn and 139 La NMR

Yusuke Sakai, Fumiya Hori, Hiroki Matsumura, Shumpei Oguchi et autres

We report a microscopic investigation of the magnetic structure and electronic properties of LaMnSi in its antiferromagnetic (AFM) state using nuclear magnetic resonance (NMR). Field-swept ⁵⁵Mn- and ¹³⁹La-NMR spectra, as well as zero-field ⁵⁵Mn-NMR (ZFNMR) spectra, reveal that the Mn ordered moments …

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Structural Phase Transition in CeMnSi under Pressure and Comparative Structural Properties of R MnSi ( R = La, Ce, Pr, Nd)

Yukihiro Kawamura, Junichi Hayashi, Keiki Takeda, Chihiro Sekine et autres

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Structural Phase Transition in CeMnSi under Pressure and Comparative Structural Properties of $R$MnSi ($R$ = La, Ce, Pr, Nd)

Yukihiro Kawamura, Jun-Ichi Hayashi, Keiki Takeda, Chihiro Sekine et autres

Powder X-ray diffraction experiments under pressure up to $\sim$10 GPa were performed on tetragonal CeFeSi-type $R$MnSi ($R$ = La, Ce, Pr, Nd). A structural phase transition was observed in CeMnSi at a critical pressure of $P_{\rm s}$ $\sim$ 5.7 GPa. In contrast, …

Diamagnetism and Quantum Oscillation in a New Dirac Electron System LaRu2Al10

Hiroshi Tanida, Takemi Yamada, Yuki Yanagi

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Anisotropic Magnetic Field–Temperature Phase Diagrams in CeCoSi

Hiroyuki Hidaka, Shun Yanagiya, S. Onodera, Tatsuya Yanagisawa et autres

The Ce-based metallic compound CeCoSi with a tetragonal structure exhibits an antiferromagnetic ordering at TN = 9.4 K and a nonmagnetic (NM) ordering accompanied by a uniform lattice distortion at T0 ∼ 12 K. A magnetic field (H)-induced phase transition accompanied by …

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