title: Ultrasound study of FeCr2S4 in high magnetic fields.
abstract: We report on ultrasound studies of FeCr2S4 in static and pulsed magnetic fields exhibiting an orbital-order transition at 9 K. A longitudinal acoustic mode exhibits distinct features in the phase space of temperature and magnetic field due to magnetic and structural transformations. Pulsed-field measurements show significant differences in the sound velocity below and above the orbital-ordering transition as well as the spin-reorientation transition at 60 K. Our results indicate a reduction of the magnetocrystalline anisotropy on entering the orbitally ordered phase.
authors.affiliation: Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau MD-2028, Republic of Moldova.
authors.forename: V
authors.initials: V
authors.lastname: Felea
authors.forename: S
authors.initials: S
authors.lastname: Yasin
authors.forename: A
authors.initials: A
authors.lastname: Günther
authors.forename: J
authors.initials: J
authors.lastname: Deisenhofer
authors.forename: H-A
authors.initials: HA
authors.lastname: Krug von Nidda
authors.forename: E-W
authors.initials: EW
authors.lastname: Scheidt
authors.forename: D V
authors.initials: DV
authors.lastname: Quach
authors.forename: J R
authors.initials: JR
authors.lastname: Groza
authors.forename: S
authors.initials: S
authors.lastname: Zherlitsyn
authors.forename: V
authors.initials: V
authors.lastname: Tsurkan
authors.forename: P
authors.initials: P
authors.lastname: Lemmens
authors.forename: J
authors.initials: J
authors.lastname: Wosnitza
authors.forename: A
authors.initials: A
authors.lastname: Loidl