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TT: Fachverband Tiefe Temperaturen
TT 24: Quantum-Critical Phenomena
TT 24.10: Talk
Tuesday, March 19, 2024, 12:00–12:15, H 2053
Magnetic Structure of the spin-1/2 antiferromagnetic XXZ chain PbCo2V2O8 — •Cintli Aguilar Maldonado1, Konrad Puzniak1,2, Ralf Feyerherm1, Karel Prokes1, Nazmul Islam1, Lukas Keller3, Yurii Skourski4, and Bella Lake1,2 — 1Helmholtz-Zentrum Berlin, Germany — 2Technische Universität Berlin, Germany — 3Paul Scherrer Institut, Switzerland — 4Helmholz-Zentrum Dresden-Rossendorf, Germany
The quasi-1D antiferromagnetic materials AM2V2O8, have been found to harbour a wealth of exotic phases including Quantum phase transitions as a function of applied magnetic field. Here the M-sites are filled by a magnetic transition metal ion such as Cu2+, Ni2+, Co2+ or Mn2+, while the divalent A-site ion and V5+ are non-magnetic. Depending on the nature of the magnetic ion, different spin moments and anisotropies can be explored. Of particular interest are the members ACo2V2O8 where A = Sr, Ba, which give rise to effective 1D spin-1/2 antiferromagnets with Heisenberg-Ising (or XXZ) exchange anisotropy due to the Co2+ ions which form 4-fold screw chains along the tetragonal c-axis. The intrachain coupling is strong and antiferromagnetic, while the interchain coupling is weak and eventually gives rise to long-range antiferromagnetic Néel order at sufficiently low temperatures. In this work PbCo2V2O8, a new and unexplored member of the ACo2V2O8 family, is studied by means of neutron powder and single crystal diffraction to determine the magnetic structure in zero magnetic field. The development of the magnetic structure under applied magnetic fields is also explored.
Keywords: 1-dimensional spin chains; Antiferromagnets; Magnetic anisotropy; Neutron diffraction; Magnetic interactions