Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba$$_3$$Mn$$_2$$O$$_8$$

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.100.237201· OSTI ID:934471

Stone, Matthew B ^[1]; Lumsden, Mark D ^[1]; Chang, S. ^[2]; Samulon, Eric C ^[3]; Batista, C. D. ^[4]; Fisher, Ian R ^[3]

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1. ORNL
2. Ames Laboratory
3. Stanford University
4. Los Alamos National Laboratory (LANL)

We present single crystal inelastic neutron scattering measurements of the $S=1$ dimerized quasi-two-dimensional antiferromagnet Ba$$_3$$Mn$$_2$$O$$_8$$. The singlet-triplet dispersion reveals nearest-neighbor and next-nearest-neighbor ferromagnetic interactions between adjacent bilayers that compete against each other. Although the inter-bilayer exchange is comparable to the intra-bilayer exchange, this additional frustration reduces the effective coupling along the $$c$$-axis and leads to a quasi-two dimensional behavior. In addition, the obtained exchange values are able to reproduce the four critical fields in the phase diagram.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 934471
• Journal Information: Physical Review Letters, Vol. 100, Issue 23; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CRITICAL FIELD
DIMERS
MONOCRYSTALS
NEUTRONS
PHASE DIAGRAMS
SCATTERING