Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 75, Issue 5, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.75.054706
Keywords
Ba3Cr2O8; S=1/2 spin singlet; magnetic property; high-field magnetization; excitation gap
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We have successfully synthesized Ba3Cr2O8 and investigated its crystal structure and magnetic properties. The crystal structure consists of Ba2+ cations and isolated CrO43- tetrahedra; magnetic chromium ions exist as rare Cr5+ (3d(1), S = 1/2). An S = 1/2 compound Ba3Cr2O8 was found to be a three-dimensional quantum spin system with a singlet ground state of dimer origin. From the analysis of magnetic susceptibility and high-field magnetization data, excitation gap is evaluated as Delta/k(B) = 16.1 K and intra- and interdimer exchange interactions are estimated as J(0)/k(B) = 25.0 K and J'/k(B) 7.7 K, respectively. Comparing with a similar spin dimer compound Ba3Mn2O8, Ba3Cr2O8 has a more dominant intradimer interaction.
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