Magnetic phase diagram of the quantum spin chain compound SrCo2V2O8: A single-crystal neutron diffraction study

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Abstract

We explore magnetic order in the quantum spin chain compound SrCo2V2O8 up to 14.9 T and down to 50 mK, using single-crystal neutron diffraction. Upon cooling in zero-field, commensurate antiferromagnetic (C-AFM) order with modulation vector=(0, 0, 1) develops below T N≃5.0K. Applying an external magnetic field (H∥c axis) destabilizes this C-AFM order, leading to an order-disorder transition between T N and ∼1.5 K. Below 1.5 K, a commensurate to incommensurate (IC-AFM) transition occurs at 3.9 T, above which the magnetic reflections can be indexed by=(0, 0, 1 ±δl). The incommensurability δl scales monotonically with H until the IC-AFM order disappears around 7.0 T. Magnetic reflections modulated by emerge again at higher fields. While the characters of the C-AFM, IC-AFM and the emergent AFM order in SrCo2V2O8 appear to fit the descriptions of the Néel, longitudinal spin density wave and transverse AFM order observed in the related compound BaCo2V2O8, our results also reveal several unique signatures that are not present in the latter, highlighting the inadequacy of mean-field theory in addressing the complex magnetic order in systems of this class.

Details

Authors
Organisations
External organisations
  • University of Birmingham
  • Stanford University
  • Stanford Linear Accelerator Center (SLAC)
  • Paul Scherrer Institute
  • State Key Laboratory of Structural Chemistry, Fuzhou
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics

Keywords

  • Low dimensional quantum magnetism, Magnetic-field-induced phase transitions, Quantum criticality
Original languageEnglish
Article number073014
JournalNew Journal of Physics
Volume21
Issue number7
Publication statusPublished - 2019 Jul 3
Publication categoryResearch
Peer-reviewedYes

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