Structural and magnetic properties in the quantum S=1/2 dimer systems Ba3(Cr1-xVx)2O8 with site disorder

Abstract

We report a comprehensive study of dc susceptibility, specific heat, neutron diffraction, and inelastic neutron scattering measurements on polycrystalline Ba3(Cr1-xVx)2O8 samples, where x=0, 0.06, 0.15, and 0.53. A Jahn-Teller structure transition occurs for x=0, 0.06, and 0.15 samples and the transition temperature is reduced upon vanadium substitution from 70(2) K at x=0 to 60(2) K at x=0.06 and 0.15. The structure becomes less distorted as x increases and such transition disappears at x=0.53. The observed magnetic excitation spectrum indicates that the singlet ground state remains unaltered and spin gap energy Δ=1.3(1) meV is identical within the instrument resolution for all x. In addition, the dispersion bandwidth W decreases with increase of x. At x=0.53, W is reduced to 1.4(1) meV from 2.0(1) meV at x=0.

11 pages, 7 figures, some typos are corrected

References in corpus (15)

• Bose-Einstein Condensation in Magnetic Insulators
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Bose-Einstein Condensation of Triplons in Ba3Cr2O8
• Wilson ratio of a Tomonaga-Luttinger liquid in a spin-1/2 Heisenberg ladder
• Singlet-triplet dispersion reveals additional frustration in the triangular dimer compound Ba${}_3$Mn${}_2$O${}_8$
• Weakly coupled $s=1/2$ quantum spin singlets in Ba${}_3$Cr${}_2$O${}_8$
• Dispersive magnetic excitations in the S=1 antiferromagnet Ba${}_3$Mn${}_2$O${}_8$
• Neutron scattering from a coordination polymer quantum paramagnet
• Effect of pressure on the quantum spin ladder material IPA-CuCl3
• Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8
• Neutron scattering study of a quasi-2D spin-1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure
• Infrared phonons and specific heat in Ba3Cr2O8
• Dynamics of the two-dimensional S=1/2 dimer system (C5H6N2F)2CuCl4
• Heat capacity of the site-diluted spin dimer system Ba3(Mn1-xVx)2O8
• Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet

Cited by in corpus (2)

• Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
• Single crystal growth and study of the magnetic properties of the mixed spin-dimer system Ba${}_{3-x}$Sr${}_x$Cr${}_2$O${}_8$