Positron Annihilation Lifetime Study of Cosi Weyl Semimetal

Anatoly Vasilievich Tsvyashchenko,Denis Salamatin,Alexander Bokov, Mikhail Kozin, Irina Romashkina, Alexander Salamatin, Maxim Mikhin, Pavel Horodek,Alla Petrova,Vladimir Sidorov,Alexander Nikolaev,Mieczysław Budzynski, Zachary Fisk

Social Science Research Network（2022）

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摘要

Positron annihilation lifetime spectroscopy (PALS) with the 48V isotope in Ti foil as a convenient positron source has been used to study the B20 single crystalsMnSi, FeSi and CoSi. The following positron lifetimes in single crystals were determined: 111(1) ps for MnSi, 114(1) for FeSi and 168(1) ps for CoSi. Italso has been established that the lifetimes in CoSi found with 22Na and 48V as positron sources are the same. The di erences in the lifetimes of MnSi, FeSi, onone side, and CoSi on the other, is attributed to the presence of Weyl fermions in single crystal CoSi.

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