High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe 12 O 19
Abstract
High quality single crystals of BaFe$$_{12}$$O$$_{19}$$ were grown with the floating zone technique in flowing oxygen atmosphere of 100 atm. BaFe$$_{12}$$O$$_{19}$$ melts incongruently in atmospheric oxygen. High oxygen pressure above 50 atm modifies the melting behavior to be congruent, which allows for the crystal growth with the crucible-free floating zone technique. Single crystal neutron diffraction were measured to determine the nuclear and magnetic structures at 4 K and 295 K. At both temperatures, there exist local electric dipoles formed by the off-mirror-plane displacements of magnetic Fe$$^{3+}$$ ions at the bypyramidal sites. The displacement at 4 K is about half of that at room temperature. The temperature dependence of specific heat shows no anomaly associated with the long range polar ordering in the temperature range of 1.90-300~K. The inverse dielectric constant along the c-axis shows a $T^2$ temperature dependence below 20 K and then following by a plateau below 10 K, recognized as quantum paraelectric features. Further cooling below 1.4 K, the upturn region was clearly revealed and indicates BaFe$$_{12}$$O$$_{19}$$ is a critical quantum paraelectric system with Fe$$^{3+}$$ ions playing roles for both magnetic and electric dipoles.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1188512
- Alternate Identifier(s):
- OSTI ID: 1215578; OSTI ID: 1421236
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- APL Materials
- Additional Journal Information:
- Journal Name: APL Materials Journal Volume: 3 Journal Issue: 6; Journal ID: ISSN 2166-532X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Cao, H. B., Zhao, Z. Y., Lee, M., Choi, E. S., McGuire, M. A., Sales, B. C., Zhou, H. D., Yan, J. -Q., and Mandrus, D. G. High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe 12 O 19. United States: N. p., 2015.
Web. doi:10.1063/1.4922934.
Cao, H. B., Zhao, Z. Y., Lee, M., Choi, E. S., McGuire, M. A., Sales, B. C., Zhou, H. D., Yan, J. -Q., & Mandrus, D. G. High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe 12 O 19. United States. https://doi.org/10.1063/1.4922934
Cao, H. B., Zhao, Z. Y., Lee, M., Choi, E. S., McGuire, M. A., Sales, B. C., Zhou, H. D., Yan, J. -Q., and Mandrus, D. G. Mon .
"High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe 12 O 19". United States. https://doi.org/10.1063/1.4922934.
@article{osti_1188512,
title = {High pressure floating zone growth and structural properties of ferrimagnetic quantum paraelectric BaFe 12 O 19},
author = {Cao, H. B. and Zhao, Z. Y. and Lee, M. and Choi, E. S. and McGuire, M. A. and Sales, B. C. and Zhou, H. D. and Yan, J. -Q. and Mandrus, D. G.},
abstractNote = {High quality single crystals of BaFe$_{12}$O$_{19}$ were grown with the floating zone technique in flowing oxygen atmosphere of 100 atm. BaFe$_{12}$O$_{19}$ melts incongruently in atmospheric oxygen. High oxygen pressure above 50 atm modifies the melting behavior to be congruent, which allows for the crystal growth with the crucible-free floating zone technique. Single crystal neutron diffraction were measured to determine the nuclear and magnetic structures at 4 K and 295 K. At both temperatures, there exist local electric dipoles formed by the off-mirror-plane displacements of magnetic Fe$^{3+}$ ions at the bypyramidal sites. The displacement at 4 K is about half of that at room temperature. The temperature dependence of specific heat shows no anomaly associated with the long range polar ordering in the temperature range of 1.90-300~K. The inverse dielectric constant along the c-axis shows a $T^2$ temperature dependence below 20 K and then following by a plateau below 10 K, recognized as quantum paraelectric features. Further cooling below 1.4 K, the upturn region was clearly revealed and indicates BaFe$_{12}$O$_{19}$ is a critical quantum paraelectric system with Fe$^{3+}$ ions playing roles for both magnetic and electric dipoles.},
doi = {10.1063/1.4922934},
journal = {APL Materials},
number = 6,
volume = 3,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 2015},
month = {Mon Jun 01 00:00:00 EDT 2015}
}
https://doi.org/10.1063/1.4922934
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