Heat capacity of the site-diluted spin dimer system Ba3(Mn1-xVx)2O8

Abstract

Heat capacity and susceptibility measurements have been performed on the diluted spin dimer compound Ba3(Mn1-xVx)2O8. The parent compound Ba3Mn2O8 is a spin dimer system based on pairs of antiferromagnetically coupled S = 1, 3d2 Mn5+ ions such that the zero field groundstate is a product of singlets. Substitution of non-magnetic S = 0, 3d0 V5+ ions leads to an interacting network of unpaired Mn moments, the low temperature properties of which are explored in the limit of small concentrations, 0<x<0.05. The zero-field heat capacity of this diluted system reveals a progressive removal of magnetic entropy over an extended range of temperatures, with no evidence for a phase transition. The concentration dependence does not conform to expectations for a spin glass state. Rather, the data suggest a low temperature random singlet phase, reflecting the hierarchy of exchange energies found in this system.

Full Publication Citation Included

References in corpus (6)

• Bose-Einstein Condensation in Magnetic Insulators
• Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$
• Asymmetric quintuplet condensation in the frustrated S=1 spin dimer compound Ba3Mn2O8
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$
• Anisotropic phase diagram of the frustrated spin dimer compound Ba3Mn2O8

Cited by in corpus (4)

• Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8
• Bose and Mott Glass Phases in Dimerized Quantum Antiferromagnets
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet
• Structural and magnetic properties in the quantum S=1/2 dimer systems Ba3(Cr1-xVx)2O8 with site disorder