Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds
The magnetocaloric effect and the critical behavior near the first to second-order phase transition of La _0.7 Ca _0.3-x Sn _x MnO _3 compounds (with x = 0–0.04), which were prepared by a conventional solid state reaction method, have been investigated. With increasing Sn-doping, a systematic decre...
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| Format: | Article |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab845b |
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| author | Dao Son Lam Nguyen Thi Dung Tran Dang Thanh Dinh Chi Linh Wen-Zhe Nan Seong Cho Yu |
| author_facet | Dao Son Lam Nguyen Thi Dung Tran Dang Thanh Dinh Chi Linh Wen-Zhe Nan Seong Cho Yu |
| author_sort | Dao Son Lam |
| collection | DOAJ |
| description | The magnetocaloric effect and the critical behavior near the first to second-order phase transition of La _0.7 Ca _0.3-x Sn _x MnO _3 compounds (with x = 0–0.04), which were prepared by a conventional solid state reaction method, have been investigated. With increasing Sn-doping, a systematic decrease in the Curie temperature ( T _C ) and the magnetic entropy change (Δ S _m ) are observed. We also pointed out that the width and the order of the magnetic phase transition in La _0.7 Ca _0.3-x Sn _x MnO _3 compounds can be easily modified by changing Sn concentration. The Banerjee criterion suggests that the Sn-undoped sample ( x = 0) undergoes a first-order phase transition (FOPT). Meanwhile, Sn-doped samples ( x = 0.02 and 0.04) undergo a second-order phase transition (SOPT). Based on the Kouvel-Fisher method and the critical isotherm analyses, we have determined the values of the critical exponents ( β , γ , and δ ) and T _C for two SOPT samples. The results obtained for x = 0.02 sample are β = 0.218, γ = 0.858, and δ = 4.717, which are close to those expected for the tricritical mean field theory. Whereas, β = 0.468, γ = 1.095 and δ = 3.315 obtained for x = 0.04 sample are close to those expected for the mean field theory. This suggests that the presence of Sn favors establishing the ferromagnetic long-range interactions in the sample. |
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| publishDate | 2020-01-01 |
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| spelling | doaj.art-62f56525fa7a4f429536b1cbc4cdaa732023-08-09T16:11:43ZengIOP PublishingMaterials Research Express2053-15912020-01-017404610110.1088/2053-1591/ab845bMagnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compoundsDao Son Lam0Nguyen Thi Dung1Tran Dang Thanh2https://orcid.org/0000-0002-8464-6743Dinh Chi Linh3Wen-Zhe Nan4Seong Cho Yu5Institute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, VietnamInstitute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam; Graduate University of Science and Technology , Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam; Thai Nguyen University of Science - Thai Nguyen University , Thai Nguyen, VietnamInstitute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam; Graduate University of Science and Technology , Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, VietnamInstitute of Materials Science, Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, Vietnam; Graduate University of Science and Technology , Vietnam Academy of Science and Technology, 18-Hoang Quoc Viet, Hanoi, VietnamDepartment of Physics, Chungbuk National University , Cheongju 28644, Republic of KoreaDepartment of Physics, Chungbuk National University , Cheongju 28644, Republic of Korea; Ulsan National Institute of Science and Technology, Ulsan 44919, Republic of KoreaThe magnetocaloric effect and the critical behavior near the first to second-order phase transition of La _0.7 Ca _0.3-x Sn _x MnO _3 compounds (with x = 0–0.04), which were prepared by a conventional solid state reaction method, have been investigated. With increasing Sn-doping, a systematic decrease in the Curie temperature ( T _C ) and the magnetic entropy change (Δ S _m ) are observed. We also pointed out that the width and the order of the magnetic phase transition in La _0.7 Ca _0.3-x Sn _x MnO _3 compounds can be easily modified by changing Sn concentration. The Banerjee criterion suggests that the Sn-undoped sample ( x = 0) undergoes a first-order phase transition (FOPT). Meanwhile, Sn-doped samples ( x = 0.02 and 0.04) undergo a second-order phase transition (SOPT). Based on the Kouvel-Fisher method and the critical isotherm analyses, we have determined the values of the critical exponents ( β , γ , and δ ) and T _C for two SOPT samples. The results obtained for x = 0.02 sample are β = 0.218, γ = 0.858, and δ = 4.717, which are close to those expected for the tricritical mean field theory. Whereas, β = 0.468, γ = 1.095 and δ = 3.315 obtained for x = 0.04 sample are close to those expected for the mean field theory. This suggests that the presence of Sn favors establishing the ferromagnetic long-range interactions in the sample.https://doi.org/10.1088/2053-1591/ab845bmagnetocaloric effectcritical behaviorferromagnetic interactions |
| spellingShingle | Dao Son Lam Nguyen Thi Dung Tran Dang Thanh Dinh Chi Linh Wen-Zhe Nan Seong Cho Yu Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds Materials Research Express magnetocaloric effect critical behavior ferromagnetic interactions |
| title | Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds |
| title_full | Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds |
| title_fullStr | Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds |
| title_full_unstemmed | Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds |
| title_short | Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds |
| title_sort | magnetocaloric effect and critical behavior near the first to second order phase transition of la0 7ca0 3 xsnxmno3 compounds |
| topic | magnetocaloric effect critical behavior ferromagnetic interactions |
| url | https://doi.org/10.1088/2053-1591/ab845b |
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