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Effects of uniaxial pressure on the spin ice Ho2Ti2 O7

Edberg, R. ; Bakke, I. M.B. ; Kondo, H. ; Sandberg, L. Ørduk ; Haubro, M. L. ; Guthrie, M. LU ; Holmes, A. T. ; Engqvist, J. LU ; Wildes, A. and Matsuhira, K. , et al. (2020) In Physical Review B 102(18).
Abstract

The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 are experimental and theoretical exemplars of highly frustrated magnetic materials. However, the effects of applied uniaxial pressure are not well studied, and here we report magnetization measurements of Ho2Ti2O7 under uniaxial pressure applied in the [001], [111], and [110] crystalline directions. The basic features are captured by an extension of the dipolar spin ice model. We find a good match between our model and measurements with pressures applied along two of the three directions, and we extend the framework to discuss the influence of crystal misalignment for the third direction. The parameters determined from the magnetization measurements reproduce neutron scattering measurements... (More)

The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 are experimental and theoretical exemplars of highly frustrated magnetic materials. However, the effects of applied uniaxial pressure are not well studied, and here we report magnetization measurements of Ho2Ti2O7 under uniaxial pressure applied in the [001], [111], and [110] crystalline directions. The basic features are captured by an extension of the dipolar spin ice model. We find a good match between our model and measurements with pressures applied along two of the three directions, and we extend the framework to discuss the influence of crystal misalignment for the third direction. The parameters determined from the magnetization measurements reproduce neutron scattering measurements that we perform under uniaxial pressure applied along the [110] crystalline direction. In the detailed analysis, we include the recently verified susceptibility dependence of the demagnetizing factor. Our work demonstrates the application of a moderate applied pressure to modify the magnetic interaction parameters. The knowledge can be used to predict critical pressures needed to induce new phases and transitions in frustrated materials, and in the case of Ho2Ti2O7 we expect a transition to a ferromagnetic ground state for uniaxial pressures above 3.3GPa.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
102
issue
18
article number
184408
publisher
American Physical Society
external identifiers
  • scopus:85096335636
ISSN
2469-9950
DOI
10.1103/PhysRevB.102.184408
language
English
LU publication?
yes
id
184ff7e6-2eda-4437-8c9a-589cc5c38b7d
date added to LUP
2020-11-30 14:26:08
date last changed
2020-12-08 02:54:39
@article{184ff7e6-2eda-4437-8c9a-589cc5c38b7d,
  abstract     = {<p>The spin ice materials Ho2Ti2O7 and Dy2Ti2O7 are experimental and theoretical exemplars of highly frustrated magnetic materials. However, the effects of applied uniaxial pressure are not well studied, and here we report magnetization measurements of Ho2Ti2O7 under uniaxial pressure applied in the [001], [111], and [110] crystalline directions. The basic features are captured by an extension of the dipolar spin ice model. We find a good match between our model and measurements with pressures applied along two of the three directions, and we extend the framework to discuss the influence of crystal misalignment for the third direction. The parameters determined from the magnetization measurements reproduce neutron scattering measurements that we perform under uniaxial pressure applied along the [110] crystalline direction. In the detailed analysis, we include the recently verified susceptibility dependence of the demagnetizing factor. Our work demonstrates the application of a moderate applied pressure to modify the magnetic interaction parameters. The knowledge can be used to predict critical pressures needed to induce new phases and transitions in frustrated materials, and in the case of Ho2Ti2O7 we expect a transition to a ferromagnetic ground state for uniaxial pressures above 3.3GPa. </p>},
  author       = {Edberg, R. and Bakke, I. M.B. and Kondo, H. and Sandberg, L. Ørduk and Haubro, M. L. and Guthrie, M. and Holmes, A. T. and Engqvist, J. and Wildes, A. and Matsuhira, K. and Lefmann, K. and Deen, P. P. and Mito, M. and Henelius, P.},
  issn         = {2469-9950},
  language     = {eng},
  number       = {18},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Effects of uniaxial pressure on the spin ice Ho2Ti2 O7},
  url          = {http://dx.doi.org/10.1103/PhysRevB.102.184408},
  doi          = {10.1103/PhysRevB.102.184408},
  volume       = {102},
  year         = {2020},
}