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

Samulon, E. C.; Shapiro, M. C.; Fisher, I. R.

doi:10.1103/PhysRevB.84.054417

Title: Heat capacity of the site-diluted spin dimer system Ba₃(Mn_1-xV_x)₂O₈

Journal Article · Fri Aug 05 00:00:00 EDT 2011 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.84.054417· OSTI ID:1100491

Samulon, E. C.; Shapiro, M. C.; Fisher, I. R.

Heat-capacity and susceptibility measurements have been performed on the diluted spin dimer compound Ba₃(Mn_1-xV_x)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 ground state is a product of singlets. Substitution of nonmagnetic 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.

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Sponsoring Organization:: USDOE

OSTI ID:: 1100491

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Vol. 84 Journal Issue: 5; ISSN 1098-0121

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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