Modification of spin-ice physics in Ho2Ti2O7 thin films

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

doi:10.1103/physrevmaterials.3.084412

Title: Modification of spin-ice physics in ${Ho}_{2} {Ti}_{2} O_{7}$ thin films

Journal Article · 16 August 2019 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.3.084412 · OSTI ID:1560624

Barry, Kevin ^[1]; Zhang, Biwen ^[1]; Anand, Naween ^[2]; Xin, Yan ^[2]; Vailionis, Arturas ^[3]; Neu, Jennifer ^[1]; Heikes, Colin ^[4]; Cochran, Charis ^[2]; Zhou, Haidong ^[5]; Qiu, Y. ^[4]; Ratcliff, William ^[4]; Siegrist, Theo ^[6]; Beekman, Christianne ^[1]

Florida State Univ., Tallahassee, FL (United States). Dept. of Physics; Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Stanford Univ., CA (United States). Stanford Nano Shared Facilities
National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Univ. of Tennessee, Knoxville, TN (United States)
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

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1560624

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 8 Vol. 3; ISSN PRMHAR; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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