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Specific Heat of CoCl2·6H2O Near Its Néel Point
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| Zeitschriftentitel: | Journal of Applied Physics |
|---|---|
| Personen und Körperschaften: | , , |
| In: | Journal of Applied Physics, 42, 1971, 4, S. 1292-1292 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
AIP Publishing
|
| Schlagwörter: |
| author_facet |
White, J. J. Song, H. I. Landau, D. P. White, J. J. Song, H. I. Landau, D. P. |
|---|---|
| author |
White, J. J. Song, H. I. Landau, D. P. |
| spellingShingle |
White, J. J. Song, H. I. Landau, D. P. Journal of Applied Physics Specific Heat of CoCl2·6H2O Near Its Néel Point General Physics and Astronomy |
| author_sort |
white, j. j. |
| spelling |
White, J. J. Song, H. I. Landau, D. P. 0021-8979 1089-7550 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.1660220 <jats:p>The specific heat of a single crystal of CoCl2·6H2O has been measured with high resolution near TN = 2.291 K using the continuous heating method. Our data have been fitted to the usual asymptotic form: C/R=Aε−α+B, where α, A, and B may assume different values below and above TN. By plotting log (∂C/∂T) vs log (ε) for different values of TN we obtained values for α′, α from the slopes of linear fits. Limits on the ``unrounded critical region'' were defined by deviations from linearity on these plots. A least-square fit of the unrounded critical regions was also made. Both techniques yield the same results: the specific heat is rounded over a region about 8 mK wide, TN-Tmax = 4 mK, α′ = −0.18±0.03 below TN, and α = +0.32±0.07 above TN. We have compared our results with the earlier measurements of Skalyo and Friedberg1 on a polycrystalline sample. Our specific heat peak is sharper near TN and rises to a maximum about 7% higher, but for ε&gt;4×10−2 the two sets of data agree quite well. Analysis of the rounding of the two peaks was made assuming the existence of subsystems having Gaussian distributions of ordering temperatures. Using this technique, we were able to fit our data in the rounded region quite well, and using the same form for the unrounded specific heat, but with a distribution half-width twice as large, we obtained good agreement with the data of Skalyo and Friedberg.</jats:p> Specific Heat of CoCl2·6H2O Near Its Néel Point Journal of Applied Physics |
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Journal of Applied Physics |
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49 |
| title |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_unstemmed |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_full |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_fullStr |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_full_unstemmed |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_short |
Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_sort |
specific heat of cocl2·6h2o near its néel point |
| topic |
General Physics and Astronomy |
| url |
http://dx.doi.org/10.1063/1.1660220 |
| publishDate |
1971 |
| physical |
1292-1292 |
| description |
<jats:p>The specific heat of a single crystal of CoCl2·6H2O has been measured with high resolution near TN = 2.291 K using the continuous heating method. Our data have been fitted to the usual asymptotic form: C/R=Aε−α+B, where α, A, and B may assume different values below and above TN. By plotting log (∂C/∂T) vs log (ε) for different values of TN we obtained values for α′, α from the slopes of linear fits. Limits on the ``unrounded critical region'' were defined by deviations from linearity on these plots. A least-square fit of the unrounded critical regions was also made. Both techniques yield the same results: the specific heat is rounded over a region about 8 mK wide, TN-Tmax = 4 mK, α′ = −0.18±0.03 below TN, and α = +0.32±0.07 above TN. We have compared our results with the earlier measurements of Skalyo and Friedberg1 on a polycrystalline sample. Our specific heat peak is sharper near TN and rises to a maximum about 7% higher, but for ε&gt;4×10−2 the two sets of data agree quite well. Analysis of the rounding of the two peaks was made assuming the existence of subsystems having Gaussian distributions of ordering temperatures. Using this technique, we were able to fit our data in the rounded region quite well, and using the same form for the unrounded specific heat, but with a distribution half-width twice as large, we obtained good agreement with the data of Skalyo and Friedberg.</jats:p> |
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| author | White, J. J., Song, H. I., Landau, D. P. |
| author_facet | White, J. J., Song, H. I., Landau, D. P., White, J. J., Song, H. I., Landau, D. P. |
| author_sort | white, j. j. |
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| description | <jats:p>The specific heat of a single crystal of CoCl2·6H2O has been measured with high resolution near TN = 2.291 K using the continuous heating method. Our data have been fitted to the usual asymptotic form: C/R=Aε−α+B, where α, A, and B may assume different values below and above TN. By plotting log (∂C/∂T) vs log (ε) for different values of TN we obtained values for α′, α from the slopes of linear fits. Limits on the ``unrounded critical region'' were defined by deviations from linearity on these plots. A least-square fit of the unrounded critical regions was also made. Both techniques yield the same results: the specific heat is rounded over a region about 8 mK wide, TN-Tmax = 4 mK, α′ = −0.18±0.03 below TN, and α = +0.32±0.07 above TN. We have compared our results with the earlier measurements of Skalyo and Friedberg1 on a polycrystalline sample. Our specific heat peak is sharper near TN and rises to a maximum about 7% higher, but for ε&gt;4×10−2 the two sets of data agree quite well. Analysis of the rounding of the two peaks was made assuming the existence of subsystems having Gaussian distributions of ordering temperatures. Using this technique, we were able to fit our data in the rounded region quite well, and using the same form for the unrounded specific heat, but with a distribution half-width twice as large, we obtained good agreement with the data of Skalyo and Friedberg.</jats:p> |
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| imprint | AIP Publishing, 1971 |
| imprint_str_mv | AIP Publishing, 1971 |
| institution | DE-D161, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1, DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1 |
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| physical | 1292-1292 |
| publishDate | 1971 |
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| series | Journal of Applied Physics |
| source_id | 49 |
| spelling | White, J. J. Song, H. I. Landau, D. P. 0021-8979 1089-7550 AIP Publishing General Physics and Astronomy http://dx.doi.org/10.1063/1.1660220 <jats:p>The specific heat of a single crystal of CoCl2·6H2O has been measured with high resolution near TN = 2.291 K using the continuous heating method. Our data have been fitted to the usual asymptotic form: C/R=Aε−α+B, where α, A, and B may assume different values below and above TN. By plotting log (∂C/∂T) vs log (ε) for different values of TN we obtained values for α′, α from the slopes of linear fits. Limits on the ``unrounded critical region'' were defined by deviations from linearity on these plots. A least-square fit of the unrounded critical regions was also made. Both techniques yield the same results: the specific heat is rounded over a region about 8 mK wide, TN-Tmax = 4 mK, α′ = −0.18±0.03 below TN, and α = +0.32±0.07 above TN. We have compared our results with the earlier measurements of Skalyo and Friedberg1 on a polycrystalline sample. Our specific heat peak is sharper near TN and rises to a maximum about 7% higher, but for ε&gt;4×10−2 the two sets of data agree quite well. Analysis of the rounding of the two peaks was made assuming the existence of subsystems having Gaussian distributions of ordering temperatures. Using this technique, we were able to fit our data in the rounded region quite well, and using the same form for the unrounded specific heat, but with a distribution half-width twice as large, we obtained good agreement with the data of Skalyo and Friedberg.</jats:p> Specific Heat of CoCl2·6H2O Near Its Néel Point Journal of Applied Physics |
| spellingShingle | White, J. J., Song, H. I., Landau, D. P., Journal of Applied Physics, Specific Heat of CoCl2·6H2O Near Its Néel Point, General Physics and Astronomy |
| title | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_full | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_fullStr | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_full_unstemmed | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_short | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| title_sort | specific heat of cocl2·6h2o near its néel point |
| title_unstemmed | Specific Heat of CoCl2·6H2O Near Its Néel Point |
| topic | General Physics and Astronomy |
| url | http://dx.doi.org/10.1063/1.1660220 |