Quantum criticality of the Ising-like screw chain antiferromagnet SrCo2V2O8 in a transverse magnetic field

Abstract

The quantum criticality of an Ising-like screw chain antiferromagnet SrCo${}_2$V${}_2$O${}_8$, with a transverse magnetic field applied along the crystalline $a$-axis, is investigated by ultra-low temperature NMR measurements. The Néel temperature is rapidly and continuously suppressed by the field, giving rise to a quantum critical point (QCP) at $H_{C{}_1}$$\approx$~7.0~T. Surprisingly, a second QCP at $H_{C{}_2}\approx$~7.7~T featured with gapless excitations is resolved from both the double-peak structure of the field dependent spin-lattice relaxation rate $1{/}^{51}{T}_1$ at low temperatures and the weakly temperature-dependent $1{/}^{51}{T}_1$ at this field. Our data, combined with numerical calculations, suggest that the induced effective staggered transverse field significantly lowers the critical fields, and leads to an exposed QCP at $H_{C{}_2}$, which belongs to the one-dimensional transverse-field Ising universality.

arXiv comment4 figure, 1 supplemental materials upon request

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