Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Quantum-Critical Phenomena
TT 24.11: Vortrag
Dienstag, 19. März 2024, 12:15–12:30, H 2053
Quantum phase transition in the quasi-1D Ising antiferromagnet SrCo2V2O8 in a transverse magnetic field — •Konrad Puzniak1,2, Cintli Aguilar-Maldonado1, Anup Bera3, Ralf Feyerherm1, Nazmul Islam1, Manfred Reehuis1, Wolfgang Schmidt4, Martin Boehm4, Paul Steffens4, Astrid Schneidewind5, Igor Radelytskyi5, Christian Balz6, Ross Stewart6, and Bella Lake1,2 — 1Helmholtz-Zentrum Berlin, Berlin, Germany — 2TU Berlin, Berlin, Germany — 3Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, India — 4Institut Laue Langevin, Grenoble, France — 5Jülich Centre at MLZ, Garching, Germany — 6Neutron and Muon Source, Didcot, UK
The one-dimensional spin-1/2 antiferromagnet with Heisenberg-Ising (XXZ) anisotropy is an ideal model system to explore fundamental physics concepts. We focus on the properties of its member, which is SrCo2V2O8. This compound crystallizes in the tetragonal space group I41cd. The Co2+ ions have effective S = 1/2 moments that are arranged in screw chains along the c axis. Weak interchain coupling gives rise to long-range magnetic order below TN = 5 K. We report on inelastic neutron scattering, low-temperature heat capacity, and neutron diffraction conducted on single crystal SrCo2V2O8 under transverse fields along the tetragonal a/b direction. In a transverse magnetic field applied along the a axis, SrCo2V2O8 undergoes a transition at the field of µ0Hc2a ≈ 6.84 T and the Néel-type magnetic ordering moment is completely suppressed in a magnetic field along the a axis, marking the emergence of a 3D quantum critical point.
Keywords: Quantum phase transition; Quantum critical point; Inelastic neutron scattering; Ising antiferromagnet; One-dimensional system