对庞磁电阻材料(LaL0.6Dy0.1)Sr0.3MnO3的磁热效应进行了研究.通过不同温度下的等温磁化(M-H)曲线的测量和计算,发现伴随铁磁-顺磁(PM-FM)相变出现大的磁热效应,额外的磁性交换作用将导致额外的磁熵变化.结果表明,(La0.6Dy0.1)Sr0.3MnO3可以作为室温下使用的磁制冷工质候选材料.
We present a study of magnetocaloric effect in the colossal magnetoresistance material (La0.6Dy0.1)Sr0.3MnO3. From the measurement and calculation of magnetization under various temperatures, we have discovered large magnetocaloric effect with the ferromagnetic-paramagnetic transition, additional magnetism exchange action introduces additional magnetic entropy change. This result suggests that (La0.6Dy0.01)Sr0.3MnO3 is a suitable candidate as working substances at room temperature in magnetic refrigeration technology.
参考文献
| [1] | Warbury E. Ann. Phys. Chem., 1881, 13: 141--146. [2] Pecharsky V K, Gschneidner K A. Phys. Rev. Lett., 1997, 78: 4494--4497. [3] Pecharsky V K, Gschneidner K A. Appl. Phys. Lett., 1997, 70: 3299--3301. [4] Hu F X, Qian X L, Sun J R, et al. J. Appl. Phys., 2002, 92: 3620--3623. [5] HU Feng-xia, Shen Bao-gen, Sun Ji-rong, et al. Appl. Phys. Lett., 2002, 80: 826--828. [6] Tegus O, Bruck E, Buschow K H J, et al. Nature, 2002, 415: 150--152. [7] Tegus O, Bruck E, Zhang L, et al. Physica B, 2002, 319: 174--192. [8] Guo Z B, Du Y W, Zhu J S, et al. Phys. Rev. Lett., 1997, 78: 1142--1145. [9] Bohigas X, Tejada J, Del Barco E, et al. Appl. Phys. Lett., 1998, 73: 390--392. [10] Bohigas X, Del Barco E, Sales M, et al. J. Magn. Magn. Mater., 1999, 196-197: 455--457. [11] Radaelli P G, Cox D E, Marezio M. Phys. Rev. Lett., 1995, 75: 4488--4491. [12] Gschneidner Jr K A, Pecharsky V K. Journal of Applied Physics, 1999, 85: 5365--5368. [13] 刘宁, 孙勇. 低温物理学报, 2000, 22: 418--422. |
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