Quantum Criticality of an Ising-like Spin-1/2 Antiferromagnetic Chain in Transverse Magnetic Field

Abstract

We report on magnetization, sound velocity, and magnetocaloric-effect measurements of the Ising-like spin-1/2 antiferromagnetic chain system BaCo${}_2$V${}_2$O${}_8$ as a function of temperature down to 1.3 K and applied transverse magnetic field up to 60 T. While across the Néel temperature of $T_N\sim 5$ K anomalies in magnetization and sound velocity confirm the antiferromagnetic ordering transition, at the lowest temperature the field-dependent measurements reveal a sharp softening of sound velocity $v(B)$ and a clear minimum of temperature $T(B)$ at $B_{\perp }^{c,3D}=21.4$ T, indicating the suppression of the antiferromagnetic order. At higher fields, the $T(B)$ curve shows a broad minimum at $B_{\perp }^c=40$ T, accompanied by a broad minimum in the sound velocity and a saturation-like magnetization. These features signal a quantum phase transition which is further characterized by the divergent behavior of the Grüneisen parameter ${\Gamma }_B\propto (B-B_{\perp }^c{)}^{-1}$. By contrast, around the critical field, the Grüneisen parameter converges as temperature decreases, pointing to a quantum critical point of the one-dimensional transverse-field Ising model.

arXiv commentPhys. Rev. Lett., to appear

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• Experimental Observation of Quantum Many-Body Excitations of $E_8$ Symmetry in the Ising Chain Ferromagnet CoNb${}_2$O${}_6$
• Intrinsic quantum Ising model on a triangular lattice magnet TmMgGaO${}_4$ and beyond
• Crossovers and critical scaling in the one-dimensional transverse-field Ising model
• Universal Thermodynamic Signature of Self-dual Quantum Critical Points
• Intrinsic transverse field in frustrated quantum Ising magnets: its physical origin and quantum effects
• Quantum Spin Supersolid as a precursory Dirac Spin Liquid in a Triangular Lattice Antiferromagnet
• Experimental observation of repulsively bound magnons
• Magnetic excitations in the one-dimensional Heisenberg-Ising model with external fields and their experimental realizations
• Analytical results for the unusual Grüneisen ratio in the quantum Ising model with Dzyaloshinskii-Moriya interaction
• Local dynamics and thermal activation in the transverse-field Ising chain
• Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets
• Field-Tuned Quantum Effects in a Triangular-Lattice Ising Magnet
• Magnetic Properties of the Ising-like Rare Earth Pyrosilicate: D-Er${}_2$Si${}_2$O${}_7$
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• Lattice vibration as a knob for novel quantum criticality: Emergence of supersymmetry from spin-lattice coupling
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• Successive magnetic orderings in the Ising spin chain magnet DyNi${}_5$Ge${}_3$
• Inducing critical phenomena in spin chains through sparse alternating fields
• Interplay of itinerant electrons and Ising moments in a hybrid honeycomb quantum magnet TmNi${}_3$Al${}_9$
• Mesons in a quantum Ising ladder
• Magnetization process of a quasi-two-dimensional quantum magnet: Two-step symmetry restoration and dimensional reduction
• Direct evidence for intermediate multiferroic phase in LiCuFe2(VO4)3
• Spin dynamics and dark particle in a weak-coupled quantum Ising ladder with ${\mathcal{D}}_8^{(1)}$ spectrum
• Incommensurate-commensurate magnetic phase transition in the double tungstate Li2Co(WO4)2
• Quantum spin dynamics of the honeycomb magnet K${}_2$Co${}_2$TeO${}_6$ in high magnetic fields
• Nonequilibrium Dynamics in a Quantum Spin Chain with Pump-Probe Resonant Inelastic X-ray Scattering
• Magnetocaloric effect measurements in ultrahigh magnetic fields up to 120 T
• Applied-field magnetic structure and spectroscopy shifts of the effective spin-$\frac{1}{2}$, $XY$-like magnet Li${}_2$CoCl${}_4$
• Thermally activated detection of dark particles in a weakly coupled quantum Ising ladder
• Emergent $D_8^{(1)}$ spectrum and topological soliton excitation in CoNb${}_2$O${}_6$
• Dynamical correlation functions in the Ising field theory