Tuning of Cr<sup>3+sup> ions doping on the magnetic and magnetocaloric properties of La<sub>0.5sub>Sr<sub>0.5sub>Mn<sub>1−<span style='font-style: italic'>xsub>Cr<sub>xsub>O<sub>3sub>
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- 作者：C. Shang<sup>asup><sup> ; sup><sup>bsup> ; Z.C. Xia<sup>asup><sup> ; sup><sup>xia9020@hust.edu.cn" class="auth_mail" title="E-mail the corresponding authorsup> ; M. Wei<sup>asup><sup> ; sup><sup>bsup> ; Z. Jin<sup>asup><sup> ; sup><sup>bsup> ; B.R. Chen<sup>asup><sup> ; sup><sup>bsup> ; L.R. Shi<sup>asup><sup> ; sup><sup>bsup> ; G.L. Xiao<sup>asup><sup> ; sup><sup>bsup> ; S. Huang<sup>asup><sup> ; sup><sup>bsup>
- 关键词：Perovskite manganites ; Doping ; Magnetocaloric effect ; Magnetic entropy change
- 刊名：Physica B: Physics of Condensed Matter
- 出版年：2016
- 出版时间：1 December 2016
- 年：2016
- 卷：502
- 期：Complete
- 页码：39-47
- 全文大小：2733 K
文摘
The effects of Cr<sup>3+sup> ions doping on the magnetic and magnetocaloric properties of manganites La<sub>0.5sub>Sr<sub>0.5sub>Mn<sub>1−xsub>Cr<sub>xsub>O<sub>3sub> (x=0.05, 0.1, 0.15, and 0.2) have been investigated. The magnetization measurements show that a ferromagnetic cluster behavior is induced by Cr<sup>3+sup> dopants and the paramagnetic to ferromagnetic transition temperature TC decreases from 319 to 251 K with increasing Cr<sup>3+sup> content from 0.05 to 0.2. The positive slope of the Arrott plots near T<sub>Csub> indicates a second order phase transition. The magnetic entropy change (−ΔS<sub>Msub>) is estimated from the isothermal magnetization measurements, and the maximum of the magnetic entropy change (−ΔS<sup>maxsup><sub>Msub>) near T<sub>Csub> shows a power law dependence of magnetic field: −ΔS<sup>maxsup><sub>Msub><span id="mmlsi0012" class="mathmlsrc"><span class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921452616303775&_mathId=si0012.gif&_user=111111111&_pii=S0921452616303775&_rdoc=1&_issn=09214526&md5=1177e9f541b69f95a21b127b3d96d412" title="Click to view the MathML source">=mn(μ<sub>0sub>H)span><span class="mathContainer hidden"><span class="mathCode">span>span>span> with n being close to the predicted value ~2/3. The experimental results suggest that the magnetic entropy change and T<sub>Csub> can be tuned by changing the Cr<sup>3+sup> ions doping level, which offers an effective method for finding an optimal doping level for magnetic refrigeration near room temperature.