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Title: Modification of spin-ice physics in Ho 2 Ti 2 O 7 thin films

Abstract

We present an extensive study on the effect of substrate orientation, strain, stoichiometry, and defects on spin-ice physics in Ho 2Ti 2O 7 thin films grown onto yttria-stabilized-zirconia substrates. We find that growth in different orientations produces different strain states in the films. All films exhibit similar c -axis lattice parameters for their relaxed portions, which are consistently larger than the bulk value of 10.1 Å. Transmission electron microscopy reveals antisite disorder and growth defects to be present in the films, but evidence of stuffing is not observed. The amount of disorder depends on the growth orientation, with the (110) film showing the least. Magnetization measurements at 1.8 K show the expected magnetic anisotropy and saturation magnetization values associated with a spin ice for all orientations; shape anisotropy is apparent when comparing in- and out-of-plane directions. Significantly, only the (110)-oriented films display the hallmark spin-ice plateau state in magnetization, albeit less well defined compared to the plateau observed in a single crystal. Neutron-scattering maps on the more disordered (111)-oriented films show the Q=0 phase previously observed in bulk materials, but the Q=X phase giving the plateau state remains elusive. We conclude that the spin-ice physics in thin films is modifiedmore » by defects and strain, leading to a reduction in the temperature at which correlations drive the system into the spin-ice state.« less

Authors:
 [1];  [1];  [2];  [2];  [3];  [1];  [4];  [2];  [5];  [4];  [4];  [6];  [1]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  2. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
  3. Stanford Univ., CA (United States). Stanford Nano Shared Facilities
  4. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  5. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Univ. of Tennessee, Knoxville, TN (United States)
  6. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Florida State Univ., Tallahassee, FL (United States). Dept. of Chemical and Biomedical Engineering
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1560624
Alternate Identifier(s):
OSTI ID: 1562767
Grant/Contract Number:  
DMR-1847887; DMR-1606952; DMR-1644779; DMR-1157490; ECCS-1542152; DMR-1508249; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, and Beekman, Christianne. Modification of spin-ice physics in Ho2Ti2O7 thin films. United States: N. p., 2019. Web. doi:10.1103/physrevmaterials.3.084412.
Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, & Beekman, Christianne. Modification of spin-ice physics in Ho2Ti2O7 thin films. United States. doi:10.1103/physrevmaterials.3.084412.
Barry, Kevin, Zhang, Biwen, Anand, Naween, Xin, Yan, Vailionis, Arturas, Neu, Jennifer, Heikes, Colin, Cochran, Charis, Zhou, Haidong, Qiu, Y., Ratcliff, William, Siegrist, Theo, and Beekman, Christianne. Fri . "Modification of spin-ice physics in Ho2Ti2O7 thin films". United States. doi:10.1103/physrevmaterials.3.084412.
@article{osti_1560624,
title = {Modification of spin-ice physics in Ho2Ti2O7 thin films},
author = {Barry, Kevin and Zhang, Biwen and Anand, Naween and Xin, Yan and Vailionis, Arturas and Neu, Jennifer and Heikes, Colin and Cochran, Charis and Zhou, Haidong and Qiu, Y. and Ratcliff, William and Siegrist, Theo and Beekman, Christianne},
abstractNote = {We present an extensive study on the effect of substrate orientation, strain, stoichiometry, and defects on spin-ice physics in Ho2Ti2O7 thin films grown onto yttria-stabilized-zirconia substrates. We find that growth in different orientations produces different strain states in the films. All films exhibit similar c -axis lattice parameters for their relaxed portions, which are consistently larger than the bulk value of 10.1 Å. Transmission electron microscopy reveals antisite disorder and growth defects to be present in the films, but evidence of stuffing is not observed. The amount of disorder depends on the growth orientation, with the (110) film showing the least. Magnetization measurements at 1.8 K show the expected magnetic anisotropy and saturation magnetization values associated with a spin ice for all orientations; shape anisotropy is apparent when comparing in- and out-of-plane directions. Significantly, only the (110)-oriented films display the hallmark spin-ice plateau state in magnetization, albeit less well defined compared to the plateau observed in a single crystal. Neutron-scattering maps on the more disordered (111)-oriented films show the Q=0 phase previously observed in bulk materials, but the Q=X phase giving the plateau state remains elusive. We conclude that the spin-ice physics in thin films is modified by defects and strain, leading to a reduction in the temperature at which correlations drive the system into the spin-ice state.},
doi = {10.1103/physrevmaterials.3.084412},
journal = {Physical Review Materials},
number = 8,
volume = 3,
place = {United States},
year = {2019},
month = {8}
}

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