Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements
An ac photopyroelectric calorimeter has been used to measure the thermal diffusivity of the perovskite manganite family La1-xSr xMnO3 on a set of single crystals with doping range 0≤x≤0.35. Taking into account that the inverse of the thermal diffusivity has the same critical behavior as the specific...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2004
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| _version_ | 1826280471790616576 |
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| author | Oleaga, A Salazar, A Prabhakaran, D Boothroyd, A |
| author_facet | Oleaga, A Salazar, A Prabhakaran, D Boothroyd, A |
| author_sort | Oleaga, A |
| collection | OXFORD |
| description | An ac photopyroelectric calorimeter has been used to measure the thermal diffusivity of the perovskite manganite family La1-xSr xMnO3 on a set of single crystals with doping range 0≤x≤0.35. Taking into account that the inverse of the thermal diffusivity has the same critical behavior as the specific heat, the critical exponent a of the magnetic transitions has been obtained. The results point to short-range interaction models for pure magnetic transitions. In the pure and lightly doped samples (x<0.10), where the transition is antiferromagnetic-paramagnetic, the critical exponent is consistent with the Heisenberg model (α=-0.11). For the highly doped samples (x>0.28), where there is a pure ferromagnetic- paramagnetic transition, the critical exponent is exactly that of an Ising behavior (α=+0.11). For 0.10≤x<0.28 no universality class was found and this behavior has been discussed taking into account the complexity of the phase diagram in this concentration range. |
| first_indexed | 2024-03-07T00:14:13Z |
| format | Journal article |
| id | oxford-uuid:7a44ae35-2431-4951-ade8-309cbff40756 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:14:13Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:7a44ae35-2431-4951-ade8-309cbff407562022-03-26T20:42:53ZCritical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurementsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:7a44ae35-2431-4951-ade8-309cbff40756EnglishSymplectic Elements at Oxford2004Oleaga, ASalazar, APrabhakaran, DBoothroyd, AAn ac photopyroelectric calorimeter has been used to measure the thermal diffusivity of the perovskite manganite family La1-xSr xMnO3 on a set of single crystals with doping range 0≤x≤0.35. Taking into account that the inverse of the thermal diffusivity has the same critical behavior as the specific heat, the critical exponent a of the magnetic transitions has been obtained. The results point to short-range interaction models for pure magnetic transitions. In the pure and lightly doped samples (x<0.10), where the transition is antiferromagnetic-paramagnetic, the critical exponent is consistent with the Heisenberg model (α=-0.11). For the highly doped samples (x>0.28), where there is a pure ferromagnetic- paramagnetic transition, the critical exponent is exactly that of an Ising behavior (α=+0.11). For 0.10≤x<0.28 no universality class was found and this behavior has been discussed taking into account the complexity of the phase diagram in this concentration range. |
| spellingShingle | Oleaga, A Salazar, A Prabhakaran, D Boothroyd, A Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title | Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title_full | Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title_fullStr | Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title_full_unstemmed | Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title_short | Critical behavior of La1-xSrxMnO3 (0 <= x <= 0.35) by thermal diffusivity measurements |
| title_sort | critical behavior of la1 xsrxmno3 0 lt x lt 0 35 by thermal diffusivity measurements |
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