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Journal Article

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

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Wu,  Jianda
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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1805.02392v1.pdf
(Preprint), 2MB

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Citation

Wang, Z., Lorenz, T., Gorbunov I, D., Cong, P. T., Kohama, Y., Niesen, S., et al. (2018). Quantum Criticality of an Ising-like Spin-1/2 Antiferromagnetic Chain in a Transverse Magnetic Field. Physical Review Letters, 120(20): 207205. doi:10.1103/PhysRevLett.120.207205.


Cite as: http://hdl.handle.net/21.11116/0000-0001-A8B6-4
Abstract
We report on magnetization, sound-velocity, and magnetocaloric-effect measurements of the Ising-like spin-1/2 antiferromagnetic chain system BaCo2V2O8 as a function of temperature down to 1.3 K and an applied transverse magnetic field up to 60 T. While across the Neel temperature of T-N similar to 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 (c,3D)(B perpendicular to) = 21.4 T, indicating the suppression of the antiferromagnetic order. At higher fields, the T(B) curve shows a broad minimum at B-perpendicular to(c) = 40 T, accompanied by a broad minimum in the sound velocity and a saturationlike magnetization. These features signal a quantum phase transition, which is further characterized by the divergent behavior of the Gruneisen parameter Gamma(B) alpha (B - B perpendicular to(c))(-1) . By contrast, around the critical field, the Gruneisen parameter converges as temperature decreases, pointing to a quantum critical point of the one-dimensional transverse-field Ising model.