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Title: Magnetic anisotropy and spin dynamics in the kagome magnet Fe4Si2Sn7O16: NMR and magnetic susceptibility study on oriented powder

Abstract

Fe4Si2Sn7O16 hosts an undistorted kagome lattice of Fe2+ (3d6, S = 2) ions. We present results of bulk magnetization and Sn nuclear magnetic resonance (NMR) measurements on an oriented Fe4Si2Sn7O16 powder sample oriented in geometries parallel (∥) and perpendicular (⊥) to the external applied magnetic field used for orienting the powder (Bori). The bulk susceptibility χ shows a broad peak at TN ~ 3 K associated with antiferromagnetic ordering. NMR spectra indicate the presence of planar anisotropy in the kagome planes. From an analysis of the static NMR shift (K) and dynamic spin-lattice relaxation rate (1/T1) we conclude the presence of dominant magnetic fluctuations in the kagome planes. For the ∥ orientation, K scales linearly with the bulk susceptibility for temperatures down to ~ 4 K, while in the ⊥ orientation K starts to deviate strongly below T ~ 30 K. We associate this deviation with the onset of spin-tilting towards the kagome planes. These correlations are also reflected in the 1/T1 data for the ∥ orientation, which starts to decrease below T ~ 30 K. Here, in this correlated regime, TN < T < ~ 30 K, we discuss the formation of positive chiral spin correlations in the kagomemore » planes.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [1]
  1. Technical Univ. of Dresden (Germany)
  2. Helmholtz-Zentrum Dresden-Rossendorf (Germany)
  3. Univ. of Auckland (New Zealand)
  4. Univ. of Auckland (New Zealand); The MacDiarmid Inst. for Advanced Materials and Nanotechnology, Wellington (New Zealand)
  5. Univ. of Sydney, NSW (Australia)
  6. Songshan Lake Materials Lab., Dongguang (China); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1771882
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 103; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Frustrated magnetism; Magnetic anisotropy; Spin dynamics; Kagome lattice; Magnetization measurements; Nuclear magnetic resonance; Susceptibility measurements

Citation Formats

Dengre, Shanu, Sarkar, R., Opherden, L., Herrmannsdörfer, T., Allison, M., Söhnel, Tilo, Ling, Chris D., Gardner, Jason S., and Klauss, H. -H. Magnetic anisotropy and spin dynamics in the kagome magnet Fe4Si2Sn7O16: NMR and magnetic susceptibility study on oriented powder. United States: N. p., 2021. Web. doi:10.1103/physrevb.103.064425.
Dengre, Shanu, Sarkar, R., Opherden, L., Herrmannsdörfer, T., Allison, M., Söhnel, Tilo, Ling, Chris D., Gardner, Jason S., & Klauss, H. -H. Magnetic anisotropy and spin dynamics in the kagome magnet Fe4Si2Sn7O16: NMR and magnetic susceptibility study on oriented powder. United States. https://doi.org/10.1103/physrevb.103.064425
Dengre, Shanu, Sarkar, R., Opherden, L., Herrmannsdörfer, T., Allison, M., Söhnel, Tilo, Ling, Chris D., Gardner, Jason S., and Klauss, H. -H. Fri . "Magnetic anisotropy and spin dynamics in the kagome magnet Fe4Si2Sn7O16: NMR and magnetic susceptibility study on oriented powder". United States. https://doi.org/10.1103/physrevb.103.064425. https://www.osti.gov/servlets/purl/1771882.
@article{osti_1771882,
title = {Magnetic anisotropy and spin dynamics in the kagome magnet Fe4Si2Sn7O16: NMR and magnetic susceptibility study on oriented powder},
author = {Dengre, Shanu and Sarkar, R. and Opherden, L. and Herrmannsdörfer, T. and Allison, M. and Söhnel, Tilo and Ling, Chris D. and Gardner, Jason S. and Klauss, H. -H.},
abstractNote = {Fe4Si2Sn7O16 hosts an undistorted kagome lattice of Fe2+ (3d6, S = 2) ions. We present results of bulk magnetization and Sn nuclear magnetic resonance (NMR) measurements on an oriented Fe4Si2Sn7O16 powder sample oriented in geometries parallel (∥) and perpendicular (⊥) to the external applied magnetic field used for orienting the powder (Bori). The bulk susceptibility χ shows a broad peak at TN ~ 3 K associated with antiferromagnetic ordering. NMR spectra indicate the presence of planar anisotropy in the kagome planes. From an analysis of the static NMR shift (K) and dynamic spin-lattice relaxation rate (1/T1) we conclude the presence of dominant magnetic fluctuations in the kagome planes. For the ∥ orientation, K scales linearly with the bulk susceptibility for temperatures down to ~ 4 K, while in the ⊥ orientation K starts to deviate strongly below T ~ 30 K. We associate this deviation with the onset of spin-tilting towards the kagome planes. These correlations are also reflected in the 1/T1 data for the ∥ orientation, which starts to decrease below T ~ 30 K. Here, in this correlated regime, TN < T < ~ 30 K, we discuss the formation of positive chiral spin correlations in the kagome planes.},
doi = {10.1103/physrevb.103.064425},
journal = {Physical Review B},
number = 6,
volume = 103,
place = {United States},
year = {Fri Feb 19 00:00:00 EST 2021},
month = {Fri Feb 19 00:00:00 EST 2021}
}

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