Specific heat of the $S=1$ spin-dimer antiferromagnet Ba${}_3$Mn${}_2$O${}_8$ in high magnetic fields

Abstract

We have measured the specific heat of the coupled spin-dimer antiferromagnet Ba${}_3$Mn${}_2$O${}_8$ to 50 mK in temperature and to 29 T in the magnetic field. The experiment extends to the midpoint of the field region (25.9 T $\le H\le$ 32.3 T) of the magnetization plateau at 1/2 of the saturation magnetization, and reveals the presence of three ordered phases in the field region between that of the magnetization plateau and the low-field spin-liquid region. The exponent of the phase boundary with the thermally disordered region is smaller than the theoretical value based on the Bose-Einstein condensation of spin triplets. At zero field and 29 T, the specific-heat data show gapped behaviors characteristic of spin liquids. The zero-field data indicate that the gapped triplet excitations form two levels whose energies differ by nearly a factor of two. At least the lower level is well localized. The data at 29 T reveal that the low-lying excitations at the magnetization plateau are weakly delocalized.

arXiv comment6 pages, 5 figures, revised version

References in corpus (14)

• Magnetization plateaus in spin chains: ``Haldane gap'' for half-integer spins
• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Commensurability, excitation gap and topology in quantum many-particle systems on a periodic lattice
• Coupled Ladders in a Magnetic Field
• Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
• Characteristic BEC scaling close to Quantum Critical Point in BaCuSi2O6
• Field-Induced Magnetic Order in Quantum Spin Liquids
• Universal scaling at field-induced magnetic phase transitions
• Magnetization plateaux of S = 1/2 two-dimensional frustrated antiferromagnet Cs${}_2$CuBr${}_4$
• Singlet Ground State and Magnetization Plateaus in Ba${}_3$Mn${}_2$O${}_8$
• High-field phase diagram of the Haldane-gap antiferromagnet $Ni(C_5{H}_{14}{N}_2{)}_2{N}_3(P{F}_6)$
• Some remarks on the Lieb-Schultz-Mattis theorem and its extension to higher dimensions
• Degeneracy of the ground-state of antiferromagnetic spin-1/2 Hamiltonians
• Field-Induced Two-Step Phase Transitions in the Singlet Ground State Triangular Antiferromagnet CsFeBr${}_3$

Cited by in corpus (13)

• Singlet ground state in the spin-1/2 dimer compound Sr3Cr2O8
• Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$
• Ordered magnetic phases of the frustrated spin-dimer compound Ba3Mn2O8
• Weakly coupled $s=1/2$ quantum spin singlets in Ba${}_3$Cr${}_2$O${}_8$
• Spin-gap opening accompanied by a strong magnetoelastic response in the S=1 magnetic dimer system Ba3BiRu2O9
• Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$
• Low-temperature heat transport of the layered spin-dimer compound Ba_3Mn_2O_8
• Theory of Magnetic Field-Induced Bose-Einstein Condensation of Triplons in Ba3Cr2O8
• Heat capacity of the site-diluted spin dimer system Ba3(Mn1-xVx)2O8
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet
• Unconventional field induced phases in a quantum magnet formed by free radical tetramers
• Bose-Einstein condensation of semi-hard bosons in S=1 dimerized organic compound F2PNNNO
• The $S=1$ dimer system K${}_2$Ni(MoO${}_4$)${}_2$: a candidate for magnon Bose-Einstein condensation