Anisotropic susceptibility of La 2-xSr xCoO 4 related to the spin states of cobalt

• Verfasst von: Hollmann, Nadine [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Anisotropic susceptibility of La 2-xSr xCoO 4 related to the spin states of cobalt
• Verf.angabe: N. Hollmann, M.W. Haverkort, M. Cwik, M. Benomar, M. Reuther, A. Tanaka and T. Lorenz
• Fussnoten: Die Gruppe "2-x", der Kleibuchstabe "x" sowie die Ziffer 4 im Titel sind tiefgestellt ; Gesehen am 07.11.2017
• Titel Quelle: Enthalten in: New journal of physics
• Jahr Quelle: 2008
• Band/Heft Quelle: 10(2008,2) Artikel-Nummer 023018, 10 Seiten
• ISSN Quelle: 1367-2630
• DOI: doi:10.1088/1367-2630/10/2/023018
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565111826

Abstract

We present a study of the magnetic susceptibility of La 2- x Sr x CoO 4 single crystals in a doping range0.3 ≤ x ≤ 0.8. Our data show a pronounced magnetic anisotropy for all compounds. This anisotropy is in agreement with a low-spin ground state ( S = 0) of Co 3+ for x ≥ 0.4 and a high-spin ground state ( S = 3/2) of Co 2+ . We compare our data with a crystal-field model calculation assuming local moments and find a good description of the magnetic behavior for x ≥ 0.5. This includes the pronounced kinks observed in the inverse magnetic susceptibility, which result from the anisotropy and low-energy excited states of Co 2+ and are not related to magnetic ordering or temperature-dependent spin-state transitions.