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  Wang, Z.; Quintero-Castro, D.L.; Zherlitsyn, S.; Yasin, S.; Skourski, Y.; Islam, A.T.M.N.; Lake, B.; Deisenhofer, J.; Loidl, A.: Field-Induced Magnonic Liquid in the 3D Spin-Dimerized Antiferromagnet Sr₃Cr₂O₈. Physical Review Letters 116 (2016), p. 147201/1-5

10.1103/PhysRevLett.116.147201
Open Access Version

Abstract:
We report on ultrasound and magnetization studies in three-dimensional, spin-dimerized Sr3Cr2O8 as a function of temperature and external magnetic field up to 61 T. It is well established [Phys. Rev. Lett. 103, 207203 (2009)] that this system exhibits a magnonic-superfluid phase between 30 and 60 T and below 8 K. By mapping ultrasound and magnetization anomalies as a function of magnetic field and temperature we establish that this superfluid phase is embedded in a domelike phase regime of a high-temperature magnonic liquid extending up to 18 K. Compared to thermodynamic results, our study indicates that the magnonic liquid could be characterized by an Ising-like order but has lost the coherence of the transverse components.