Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C${}_9$H${}_{18}$N${}_2$CuBr${}_4$

Abstract

We present specific-heat and neutron-scattering results for the \emph{S}=1/2 quantum antiferromagnet (dimethylammonium)(3,5-dimethylpyridinium)CuBr${}_4$. The material orders magnetically at \emph{T}${}_N$=1.99(2)\,K, and magnetic excitations are accompanied by an energy gap of 0.30(2) meV due to spin anisotropy. The system is best described as coupled two-leg spin-1/2 ladders with the leg exchange $J_{\mathrm{leg}}$=0.60(2)~meV, rung exchange $J_{\mathrm{rung}}$=0.64(9)~meV, interladder exchange $J_{\mathrm{int}}$=0.19(2)~meV, and an interaction-anisotropy parameter $\lambda$=0.93(2), according to inelastic neutron-scattering measurements. In contrast to most spin ladders reported to date, the material is a rare example in which the interladder coupling is very near the critical value required to drive the system to a Néel-ordered phase without an assistance of a magnetic field.

arXiv comment6 pages, 4 figures

References in corpus (28)

• Critical Phenomena and Renormalization-Group Theory
• Coupled Ladders in a Magnetic Field
• Thermodynamics and spin gap of the Heisenberg ladder calculated by the look-ahead Lanczos algorithm
• Perturbation Theory by Flow Equations: Dimerized and Frustrated S=1/2 Chain
• Critical Properties of gapped spin-1/2 chains and ladders in a magnetic field
• Statics and dynamics of weakly coupled antiferromagnetic spin-1/2 ladders in a magnetic field
• Dynamics of composite Haldane spin chains in IPA-CuCl3
• One- and Two-Triplon Spectra of a Cuprate Ladder
• The Structure of Operators in Effective Particle-Conserving Models
• Direct Observation of Magnon Fractionalization in the Quantum Spin Ladder
• Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
• Field-Controlled Magnetic Order in the Quantum Spin-Ladder System (Hpip)2CuBr4
• Evidence of a magnetic Bose glass in IPA-Cu(Cl0.95Br0.05)3 from neutron diffraction
• Spectral and thermodynamic properties of a strong-leg quantum spin ladder
• Nearly critical ground state of LaCuO2.5
• Spectrum of a magnetized strong-leg quantum spin ladder
• Excitations from a Bose-Einstein condensate of magnons in coupled spin ladders
• Magnetic properties of the S=1/2 quasi-one-dimensional antiferromagnet CaCu2O3
• Wilson ratio of a Tomonaga-Luttinger liquid in a spin-1/2 Heisenberg ladder
• Complete bond-operator theory of the two-chain spin ladder
• Symmetric and asymmetric excitations of a strong-leg quantum spin ladder
• Dynamical Properties of an Antiferromagnet near the Quantum Critical Point: Application to LaCuO_2.5
• Neutron scattering evidence for isolated spin-1/2 ladders in (C${}_5$D${}_{12}$N)${}_2$CuBr${}_4$
• Long-lived magnons throughout the Brillouin zone of the strong-leg spin ladder (C${}_7$H${}_{10}$N)${}_2$CuBr${}_4$
• Incommensurate dynamic correlations in the quasi-two-dimensional spin liquid BiCu2PO6
• Neutron scattering from a coordination polymer quantum paramagnet
• Microscopic model for Bose-Einstein condensation and quasiparticle decay
• Quantum Phase Transition in Coupled Spin Ladders

Cited by in corpus (10)

• Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
• Optimizing linked cluster expansions by white graphs
• Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet
• Theoretical study of the spin and charge dynamics of two-leg ladders as probed by resonant inelastic x-ray scattering
• Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6
• S=1/2 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6
• Evidence for pressure induced unconventional quantum criticality in the coupled spin ladder antiferromagnet C${}_9$H${}_{18}$N${}_2$CuBr${}_4$
• The Higgs Mode of Planar Coupled Spin-Ladders and its Observation in C${}_9$H${}_{18}$N${}_2$CuBr${}_4$
• Quantum phases of the biased two-chain-coupled Bose-Hubbard Ladder
• Ising spin ladders of orthopyroxene CoGeO${}_3$