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

Shen, L. LU ; Zaharko, O. ; Birk, Jonas Okkels ; Jellyman, E. ; He, Z. and Blackburn, E. LU (2019) In New Journal of Physics 21(7).
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Low dimensional quantum magnetism, Magnetic-field-induced phase transitions, Quantum criticality
in
New Journal of Physics
volume
21
issue
7
article number
073014
publisher
IOP Publishing
external identifiers
  • scopus:85070548672
ISSN
1367-2630
DOI
10.1088/1367-2630/ab2b7a
project
Accessing high pressure and low temperature states of exotic magnetism
language
English
LU publication?
yes
id
20bfad19-c630-42d7-a380-20497d7e91c6
date added to LUP
2019-10-02 16:34:01
date last changed
2020-02-12 10:15:46
@article{20bfad19-c630-42d7-a380-20497d7e91c6,
  abstract     = {<p>We explore magnetic order in the quantum spin chain compound SrCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub> 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 <sub>N</sub>≃5.0K. Applying an external magnetic field (H∥c axis) destabilizes this C-AFM order, leading to an order-disorder transition between T <sub>N</sub> 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 SrCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub> appear to fit the descriptions of the Néel, longitudinal spin density wave and transverse AFM order observed in the related compound BaCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub>, 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.</p>},
  author       = {Shen, L. and Zaharko, O. and Birk, Jonas Okkels and Jellyman, E. and He, Z. and Blackburn, E.},
  issn         = {1367-2630},
  language     = {eng},
  month        = {07},
  number       = {7},
  publisher    = {IOP Publishing},
  series       = {New Journal of Physics},
  title        = {Magnetic phase diagram of the quantum spin chain compound SrCo<sub>2</sub>V<sub>2</sub>O<sub>8</sub> : A single-crystal neutron diffraction study},
  url          = {https://lup.lub.lu.se/search/ws/files/70270058/Shen2019_SZBJ.pdf},
  doi          = {10.1088/1367-2630/ab2b7a},
  volume       = {21},
  year         = {2019},
}