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  Puzniak, K.; Aguilar-Maldonado, C.; Feyerherm, R.; Prokes, K.; Islam, A.T.M.N.; Skourski, Y.; Keller, L.; Lake, B.: Magnetic structure and phase diagram of the Heisenberg-Ising spin chain antiferromagnetic PbCo₂V₂O₈. Physical Review B 108 (2023), p. 144432/1-12

10.1103/physrevb.108.144432
Open Access Version

Abstract:
The effective spin-1/2 antiferromagnetic Heisenberg-Ising chain materials, ACo2V2O8, A = Sr, Ba, are a rich source of exotic fundamental phenomena and have been investigated for their model magnetic properties both in zero and nonzero magnetic fields. Here we investigate a new member of the family, namely, PbCo2V2O8. We synthesize powder and single-crystal samples of PbCo2V2O8 and determine its magnetic structure using neutron diffraction. Furthermore, the magnetic field/temperature phase diagrams for a magnetic field applied along the c, a, and [110] crystallographic directions in the tetragonal unit cell are determined via magnetization and heat capacity measurements. A complex series of phases and quantum phase transitions are discovered that strongly depend on both the magnitude and direction of the field. Our results show that PbCo2V2O8 is an effective spin-1/2 antiferromagnetic Heisenberg-Ising chain with properties that are, in general, comparable to those of SrCo2V2O8 and BaCo2V2O8. One interesting departure from the results of these related compounds is, however, the discovery of a new field-induced phase for the field direction H//[110].