Spin-state transition in LaCoO3

• Verfasst von: Podlesnyak, Andrey [VerfasserIn]
• Verfasst von: Haverkort, Maurits W. [VerfasserIn]
• Titel: Spin-state transition in LaCoO3
• Titelzusatz: direct neutron spectroscopic evidence of excited magnetic states
• Verf.angabe: A. Podlesnyak, S. Streule, J. Mesot, M. Medarde, E. Pomjakushina, K. Conder, M.W. Haverkort, and D.I. Khomskii
• Fussnoten: Die Ziffer "3" im Titel ist tiefgestellt ; Gesehen am 28.11.2017
• Titel Quelle: Enthalten in: De.arxiv.org
• Jahr Quelle: 2005
• Band/Heft Quelle: (2005) Artikel-Nummer 0505344, 10 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565754433

Abstract

A gradual spin-state transition occurs in LaCoO3 around T~80-120 K, whose detailed nature remains controversial. We studied this transition by means of inelastic neutron scattering (INS), and found that with increasing temperature an excitation at ~0.6 meV appears, whose intensity increases with temperature, following the bulk magnetization. Within a model including crystal field interaction and spin-orbit coupling we interpret this excitation as originating from a transition between thermally excited states located about 120 K above the ground state. We further discuss the nature of the magnetic excited state in terms of intermediate-spin (IS, S=1) vs. high-spin (HS, S=2) states. Since the g-factor obtained from the field dependence of the INS is g~3, the second interpretation looks more plausible.