title: Crystal handedness and spin helix chirality in Fe1-xCoxSi.
abstract: We show, with the help of polarized neutrons, that the cubic magnets Fe1-xCoxSi with Dzyaloshinskii-Moriya interaction can be switched between left (for x=0.1, 0.15) and right (for x=0.2, 0.25, 0.3, 0.5) chiral states of the spin helix. The absolute structure was evaluated using x-ray diffraction. The crystals are shown to be enantiopure and the structural chirality changes from right handed for x<0.2 to left handed for x>0.2. These compounds are compared with the etalon sample of MnSi which is identified as having the left-handed chirality both in the magnetic and crystallographic sense.
authors.affiliation: Petersburg Nuclear Physics Institute, Gatchina, 188300 St. Petersburg, Russia.
authors.forename: S V
authors.initials: SV
authors.lastname: Grigoriev
authors.forename: D
authors.initials: D
authors.lastname: Chernyshov
authors.forename: V A
authors.initials: VA
authors.lastname: Dyadkin
authors.forename: V
authors.initials: V
authors.lastname: Dmitriev
authors.forename: S V
authors.initials: SV
authors.lastname: Maleyev
authors.forename: E V
authors.initials: EV
authors.lastname: Moskvin
authors.forename: D
authors.initials: D
authors.lastname: Menzel
authors.forename: J
authors.initials: J
authors.lastname: Schoenes
authors.forename: H
authors.initials: H
authors.lastname: Eckerlebe