| Autor: |
Takaki, Kensuke, Yamamoto, Mayu, Nakajima, Masamichi, Takeuchi, Tetsuya, Nguyen, Hoang Yen, Nohara, Minoru, Kishioji, Yasuhiro, Fujii, Takahiro, Yoshino, Kentaro, Miyasaka, Shigeki, Kudo, Kazutaka |
| Zdroj: |
Journal of the Physical Society of Japan; 3/15/2022, Vol. 91 Issue 3, p1-6, 6p |
| Abstrakt: |
The novel CdI2-type compounds Pt(Bi1−xChx)2 (Ch = Se, Te) were synthesized. Powder X-ray diffraction experiments and Rietveld analysis revealed that the partial substitution of Ch for Bi induces a structural phase transition from the noncentrosymmetric polar structure of trigonal PtBi2 (P31m, \(C_{3v}^{2}\) , No. 157) to the centrosymmetric nonpolar CdI2-type structure (\(P\bar{3}m1\) , \(D_{3d}^{3}\) , No. 164), which consists of stacked Pt(Bi1−xChx)2 layers formed by edge-sharing PtBi6 octahedra. Magnetization, electrical resistivity, and specific heat measurements confirmed the emergence of superconductivity at the transition temperature Tc = 1.9–2.4 and 2.0–2.4 K in Pt(Bi1−xSex)2 and Pt(Bi1−xTex)2, respectively. These temperatures are much higher than Tc = 0.6 K of trigonal PtBi2. The superconducting phases lie in the vicinity of the polar-nonpolar structural phase boundary. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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