Alisha Nurshafiqah Binti Amat Dalan

Muroran Institute of Technology

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Yukihiro Kawamura

Muroran Institute of Technology

Hiroshi Tanida

Toyama Prefectural University

Kakeru Ikeda

Muroran Institute of Technology

Chihiro Sekine

Yokohama National University

Hiroki Takahashi

Chiba Cancer Center

Takeshi Matsumura

Hiroshima University

Junichi Hayashi

Muroran Institute of Technology

Hanming Ma

The University of Tokyo

Keiki Takeda

Muroran Institute of Technology

Junichi Hayashi

Muroran Institute of Technology

Cooperative Institutions

The University of Tokyo

Muroran Institute of Technology

Tohoku University

Kobe University

Tokyo Metropolitan University

Institute for Solid State Physics and Optics

Hiroshima University

Niigata University

Nihon University

Osaka University

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Structural Analysis of CeCoSi under Pressure

Alisha Nurshafiqah Binti Amat Dalan Kota Saito Kakeru Ikeda Hiroshi Tanida Junichi Hayashi

10.7566/jpscp.38.011085

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Pressure Induced Superconductivity and Multiple Structural Transitions in CsCl-Type Cubic CeZn Single Crystal

Crystals (2022)

Xiaoling Shen Hanming Ma Dilip Bhoi Jun Gouchi Yoshiya Uwatoko

CsCl-type cubic compound CeZn exhibits a paramagnetic (PM) to antiferromagnetic (AFM) first-order transition at TN ~ 30 K accompanied by a simultaneous structural transition from cubic to tetragonal structure as temperature decreases. Applying the pressure, the coupled magnetic and crystal structural transition becomes separated above 1.0 GPa and then the AFM order changes to ferromagnetic (FM). The FM ordering temperature decreases with further applying pressure and changes to a nonmagnetic state above ~3.0 GPa. In the nonmagnetic state, we discovered superconductivity below Tsc ~ 1.3 K over 5.5 GPa, which survives even up to 9.5 GPa. Investigation of single crystal X-ray diffraction at room temperature reveals that CeZn undergoes a sequential crystal structural change with increasing pressure from cubic at ambient pressure to the monoclinic structure at 8.2 GPa via tetragonal and orthorhombic structure. The detailed analysis of crystal structure in CeZn single crystal evidenced that the emergence of superconductivity is related to the orthorhombic-to-monoclinic transition implying a nonmagnetic origin of the Cooper pair formation.

Monoclinic crystal system

Tetragonal crystal system

Orthorhombic crystal system

Ambient pressure

Crystal (programming language)

10.3390/cryst12050571

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Structural Phase Transition and Possible Valence Instability of Ce-4f Electron Induced by Pressure in CeCoSi

Journal of the Physical Society of Japan (2022)

Yukihiro Kawamura Kakeru Ikeda Alisha Nurshafiqah Binti Amat Dalan Junichi Hayashi Keiki Takeda

X-ray powder diffraction and electrical resistivity measurements were performed on the tetragonal compound CeCoSi under pressure to elucidate the phase boundary of the pressure-induced structural transition and the change in the 4$f$ electronic state. The temperature-pressure phase diagram has been determined from the shift of the Bragg peaks and from the anomaly in the resistivity. The critical pressure, $P_{\rm s}$ $\sim$ 4.9 GPa at 300 K, decreases to $P_{\rm s}$ $\sim$ 3.6 GPa at 10 K. The decrease of $P_{\rm s}$ is due not only to the decrease in volume of the unit cell but also to an anisotropic shrinkage by cooling. When crossing the boundary to the high-pressure phase, the resistivity shows a significant drop to exhibit a metallic temperature dependence. The results of this study strongly suggest that the structural phase transition can be ascribed to valence instability of Ce-$4f$ electron.

Valence electron

10.7566/jpsj.91.064714

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Citations (6)