Anomalous Positron Lifetime in Single Crystal of Weyl Semimetal CoSi

The positron annihilation lifetimes were measured using a 48V positron source in noncentrosymmetric cubic single crystals of CoSi, FeSi and MnSi. The following lifetimes were determined from the positron annihilation time spectra: 168(1) ps for CoSi, 114(1) ps for FeSi and 111(1) ps for MnSi. For si...

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Published inCrystals (Basel) Vol. 13; no. 3; p. 509
Main Authors Salamatin, D. A., Bokov, A. V., Kozin, M. G., Romashkina, I. L., Salamatin, A. V., Mikhin, M. V., Petrova, A. E., Sidorov, V. A., Nikolaev, A. V., Fisk, Z., Tsvyashchenko, A. V.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2023
Subjects
48V positron source
Bridgman method
Energy
Experiments
Ferrosilicon
Graphene
Heat conductivity
Iron silicide
Laboratories
Lifetime
noncentrosymmetric structure B20
Nuclear physics
Positron annihilation
Positronium
Positrons
Sensors
Single crystals
Sodium 22
Spectrum analysis
Titanium
Russia
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Summary:The positron annihilation lifetimes were measured using a 48V positron source in noncentrosymmetric cubic single crystals of CoSi, FeSi and MnSi. The following lifetimes were determined from the positron annihilation time spectra: 168(1) ps for CoSi, 114(1) ps for FeSi and 111(1) ps for MnSi. For single-crystal CoSi, the positron annihilation lifetime was also determined with a 22Na positron source. For CoSi, the lifetimes obtained from different positron sources are consistent. The differences in the positron annihilation lifetimes in MnSi and FeSi, on the one hand, and in the Weyl semimetal CoSi, on the other hand, are possibly caused by the formation of a positron + electron bound state (positronium).
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst13030509