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

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 $${{\boldsymbol{k}}}_{{\rm{C}}}$$ = (0, 0, 1) develops below T N ≃ 5.0 K. 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 $${{\boldsymbol{k}}}_{{\rm{IC}}}$$ = (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 $${{\boldsymbol{k}}}_{{\rm{C}}}$$ 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.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5]
  1. Univ. of Birmingham (United Kingdom); Lund Univ. (Sweden); SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Univ. of Birmingham (United Kingdom)
  4. Chinese Academy of Sciences (CAS), Fuzhou (China)
  5. Univ. of Birmingham (United Kingdom); Lund Univ. (Sweden)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1546895
Grant/Contract Number:  
AC02-76SF00515; EP/J016977/1; 21573235; KJZD-EW-M05
Resource Type:
Accepted Manuscript
Journal Name:
New Journal of Physics
Additional Journal Information:
Journal Volume: 21; Journal Issue: 7; Journal ID: ISSN 1367-2630
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Shen, L., Zaharko, O., Birk, J. O., Jellyman, E., He, Z., and Blackburn, E. Magnetic phase diagram of the quantum spin chain compound SrCo2V2O8 : a single-crystal neutron diffraction study. United States: N. p., 2019. Web. doi:10.1088/1367-2630/ab2b7a.
Shen, L., Zaharko, O., Birk, J. O., Jellyman, E., He, Z., & Blackburn, E. Magnetic phase diagram of the quantum spin chain compound SrCo2V2O8 : a single-crystal neutron diffraction study. United States. https://doi.org/10.1088/1367-2630/ab2b7a
Shen, L., Zaharko, O., Birk, J. O., Jellyman, E., He, Z., and Blackburn, E. Thu . "Magnetic phase diagram of the quantum spin chain compound SrCo2V2O8 : a single-crystal neutron diffraction study". United States. https://doi.org/10.1088/1367-2630/ab2b7a. https://www.osti.gov/servlets/purl/1546895.
@article{osti_1546895,
title = {Magnetic phase diagram of the quantum spin chain compound SrCo2V2O8 : a single-crystal neutron diffraction study},
author = {Shen, L. and Zaharko, O. and Birk, J. O. and Jellyman, E. and He, Z. and Blackburn, E.},
abstractNote = {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 ${{\boldsymbol{k}}}_{{\rm{C}}}$ = (0, 0, 1) develops below T N ≃ 5.0 K. 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 ${{\boldsymbol{k}}}_{{\rm{IC}}}$ = (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 ${{\boldsymbol{k}}}_{{\rm{C}}}$ 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.},
doi = {10.1088/1367-2630/ab2b7a},
journal = {New Journal of Physics},
number = 7,
volume = 21,
place = {United States},
year = {Thu Jun 20 00:00:00 EDT 2019},
month = {Thu Jun 20 00:00:00 EDT 2019}
}

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