Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires
We report a systematic study of the magnetic and thermodynamic properties of uniform La0.7Ca0.3CoO3 nanowires prepared by a hydrothermal method, and compare them with the bulk counterpart. The nanowires, ∼59 nm in diameter, are single crystalline as revealed by electron microscopy. With decreasing t...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2013
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| Online Access: | https://hdl.handle.net/10356/96621 http://hdl.handle.net/10220/10366 |
| _version_ | 1811685515597971456 |
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| author | Wang, Yang Fan, Hong Jin |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wang, Yang Fan, Hong Jin |
| author_sort | Wang, Yang |
| collection | NTU |
| description | We report a systematic study of the magnetic and thermodynamic properties of uniform La0.7Ca0.3CoO3 nanowires prepared by a hydrothermal method, and compare them with the bulk counterpart. The nanowires, ∼59 nm in diameter, are single crystalline as revealed by electron microscopy. With decreasing temperature, the bulk La0.7Ca0.3CoO3 shows a ferromagnetism followed by a reentrant glass state, whereas the nanowires show only a purely ferromagnetic ground state. The thermopower and specific heat results indicate that there exist enhanced spin and/or orbital fluctuations in the nanowires that could be responsible for the absence of the glass state. Critical behavior analysis shows that the nanowires fall into a three-dimensional Heisenberg ferromagnet class. |
| first_indexed | 2024-10-01T04:45:45Z |
| format | Journal Article |
| id | ntu-10356/96621 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:45:45Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/966212020-03-07T12:34:43Z Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires Wang, Yang Fan, Hong Jin School of Physical and Mathematical Sciences We report a systematic study of the magnetic and thermodynamic properties of uniform La0.7Ca0.3CoO3 nanowires prepared by a hydrothermal method, and compare them with the bulk counterpart. The nanowires, ∼59 nm in diameter, are single crystalline as revealed by electron microscopy. With decreasing temperature, the bulk La0.7Ca0.3CoO3 shows a ferromagnetism followed by a reentrant glass state, whereas the nanowires show only a purely ferromagnetic ground state. The thermopower and specific heat results indicate that there exist enhanced spin and/or orbital fluctuations in the nanowires that could be responsible for the absence of the glass state. Critical behavior analysis shows that the nanowires fall into a three-dimensional Heisenberg ferromagnet class. 2013-06-13T08:13:15Z 2019-12-06T19:33:06Z 2013-06-13T08:13:15Z 2019-12-06T19:33:06Z 2011 2011 Journal Article Wang, Y., & Fan, H. J. (2012). Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires. Acta Materialia, 60(3), 1238-1245. 1359-6454 https://hdl.handle.net/10356/96621 http://hdl.handle.net/10220/10366 10.1016/j.actamat.2011.11.036 en Acta materialia © 2011 Acta Materialia Inc. |
| spellingShingle | Wang, Yang Fan, Hong Jin Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title | Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title_full | Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title_fullStr | Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title_full_unstemmed | Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title_short | Critical behavior and the absence of glass state in ferromagnetic La0.7Ca0.3CoO3 nanowires |
| title_sort | critical behavior and the absence of glass state in ferromagnetic la0 7ca0 3coo3 nanowires |
| url | https://hdl.handle.net/10356/96621 http://hdl.handle.net/10220/10366 |
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