Magnetic excitations from the singlet dimerized state in Na2 Co2 (C2 O4) 3 (H2 O) 2

M. Matsuda, S. Wakimoto, K. Kakurai, Z. Honda, K. Yamada

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Abstract

Na2 Co2 (C2 O4) 3 (H2 O) 2 consists of two-leg ladders of Co2+ ions. It was reported that this is a candidate compound to show a magnetic state in the vicinity of the gapped and the Néel ordered state, where the quantum phase transition occurs. Neutron scattering experiments were performed to study the magnetic ground state of this compound. It is found that the system is well described by an almost isolated dimer model, in which dimers are formed between spins along the rung direction and the interaction along the rung direction is much larger than that along the leg direction. The intradimer coupling constant is determined to be 5.2 meV. Other interactions were found to be very small.

Original languageEnglish
Article number012405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number1
DOIs
StatePublished - 2007
Externally publishedYes

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