Appendix
Tracking Disorder Broadening and
Hysteresis in First-Order Phase Transitions
via the Electromagnon Response in Improper
Ferroelectrics
In the original version of this thesis an additional chapter is present, situated between
Chaps. 4 and 5 of this Springer version, however this chapter has not been reproduced
here for copyright reasons. The content that makes up the orginal chapter has been
published previously, and is available elsewhere, as C. D. W. Mosley et al., Journal of
Physics D: Applied Physics 51, 084002 (2018). DOI: https://doi.org/10.1088/13616463/aaa836.
Abstract
We demonstrate that electromagnons can be used to directly probe the nature of a
phase transition between magnetically ordered phases in an improper ferroelectric.
The antiferromagnetic/paraelectric to antiferromagnetic/ ferroelectric phase transition in Cu 1−x Zn x O (x = 0, 0.05) alloys was tracked via the electromagnon response
using terahertz time-domain spectroscopy, on heating and cooling through the phase
transition. The transition was found to exhibit thermal hysteresis, confirming its
first-order nature, and to broaden under the influence of spin-disorder upon Zn substitution. The energy of the electromagnon increases upon alloying, as a result of the
non-magnetic ions modifying the magnetic interactions that give rise to the multiferroic phase and electromagnons. We describe our findings in the context of recent
theoretical work that examined improper ferroelectricity and electromagnons in CuO
from phenomenological and first-principles approaches.
© IOP Publishing. Reproduced with permission. All rights reserved.
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Switzerland AG 2021
C. D. W. Mosley et al., Enhanced Polarisation Control and Extreme
Electric Fields, Springer Theses,
https://doi.org/10.1007/978-3-030-66902-7
115
Tracking Disorder Broadening and
Hysteresis in First-Order Phase Transitions
via the Electromagnon Response in Improper
Ferroelectrics
In the original version of this thesis an additional chapter is present, situated between
Chaps. 4 and 5 of this Springer version, however this chapter has not been reproduced
here for copyright reasons. The content that makes up the orginal chapter has been
published previously, and is available elsewhere, as C. D. W. Mosley et al., Journal of
Physics D: Applied Physics 51, 084002 (2018). DOI: https://doi.org/10.1088/13616463/aaa836.
Abstract
We demonstrate that electromagnons can be used to directly probe the nature of a
phase transition between magnetically ordered phases in an improper ferroelectric.
The antiferromagnetic/paraelectric to antiferromagnetic/ ferroelectric phase transition in Cu 1−x Zn x O (x = 0, 0.05) alloys was tracked via the electromagnon response
using terahertz time-domain spectroscopy, on heating and cooling through the phase
transition. The transition was found to exhibit thermal hysteresis, confirming its
first-order nature, and to broaden under the influence of spin-disorder upon Zn substitution. The energy of the electromagnon increases upon alloying, as a result of the
non-magnetic ions modifying the magnetic interactions that give rise to the multiferroic phase and electromagnons. We describe our findings in the context of recent
theoretical work that examined improper ferroelectricity and electromagnons in CuO
from phenomenological and first-principles approaches.
© IOP Publishing. Reproduced with permission. All rights reserved.
© The Editor(s) (if applicable) and The Author(s), under exclusive license
to Springer Nature Switzerland AG 2021
C. D. W. Mosley et al., Enhanced Polarisation Control and Extreme
Electric Fields, Springer Theses,
https://doi.org/10.1007/978-3-030-66902-7
115
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