Phonon activity and intermediate glassy phase of YVO₃
We show that in YVO₃ additional hard phonons gradually become zone center infrared active below ∼210 K, verifying that a lattice phase transition takes place at about that temperature. Their gradual increment in intensity between ∼210 and ∼77 K is associated with a "glassy" behavior found...
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| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2004
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/126296 |
| Aporte de: |
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I19-R120-10915-126296 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas phonon activity temperatures antiferromagnetism |
| spellingShingle |
Ciencias Exactas phonon activity temperatures antiferromagnetism Massa, Néstor Emilio Piamonteze, Cinthia Tolentino, Hélio C. N. Alonso, José Antonio Martínez Lope, María Jesús Casais, María Teresa Phonon activity and intermediate glassy phase of YVO₃ |
| topic_facet |
Ciencias Exactas phonon activity temperatures antiferromagnetism |
| description |
We show that in YVO₃ additional hard phonons gradually become zone center infrared active below ∼210 K, verifying that a lattice phase transition takes place at about that temperature. Their gradual increment in intensity between ∼210 and ∼77 K is associated with a "glassy" behavior found in the temperature-dependent V K edge pseudoradial distribution. This translates into an increase in the Debye-Waller factors ascribed to the appearance of V local structural disorder below ∼150 K. Conflicts between various ordering mechanisms in YVO₃ bring up similarities of the intermediate phase to known results in dielectric incommensurate systems, suggesting the formation of commensurate domains below 116 K, the onset temperature of G-type antiferromagnetism. We propose that ∼210 and ∼77 K be understood as the temperatures where the commensurate-incommensurate and incommensurate-commensurate "lock-in" phase transitions take place. We found support for this interpretation in the inverted λ shapes of the measured heat capacity and in the overall temperature dependence of the hard phonons. |
| format |
Articulo Articulo |
| author |
Massa, Néstor Emilio Piamonteze, Cinthia Tolentino, Hélio C. N. Alonso, José Antonio Martínez Lope, María Jesús Casais, María Teresa |
| author_facet |
Massa, Néstor Emilio Piamonteze, Cinthia Tolentino, Hélio C. N. Alonso, José Antonio Martínez Lope, María Jesús Casais, María Teresa |
| author_sort |
Massa, Néstor Emilio |
| title |
Phonon activity and intermediate glassy phase of YVO₃ |
| title_short |
Phonon activity and intermediate glassy phase of YVO₃ |
| title_full |
Phonon activity and intermediate glassy phase of YVO₃ |
| title_fullStr |
Phonon activity and intermediate glassy phase of YVO₃ |
| title_full_unstemmed |
Phonon activity and intermediate glassy phase of YVO₃ |
| title_sort |
phonon activity and intermediate glassy phase of yvo₃ |
| publishDate |
2004 |
| url |
http://sedici.unlp.edu.ar/handle/10915/126296 |
| work_keys_str_mv |
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Repositorios |
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