Ferromagnetism and metallicity in Sm 0.2 Ca 0.8 Mn 1-x Ru x O 3 (x=0-0.08): Interplay between Ru doping and hydrostatic pressure
Ferromagnetism and metallicity in Sm 0.2 Ca 0.8 Mn 1-x Ru x O 3 (x=0-0.08): Interplay between Ru doping and hydrostatic pressure
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DOI：
10.1103/physrevb.65.224415
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发表时间：
2002-05
影响因子：
3.7
通讯作者：
V. Markovich;I. Fita;R. Puźniak;E. Rozenberg;A. Wisniewski;C. Martin;A. Maignan;M. Hervieu;
中科院分区：
文献类型：
--
作者：
V. Markovich;I. Fita;R. Puźniak;E. Rozenberg;A. Wisniewski;C. Martin;A. Maignan;M. Hervieu;
Sm 0 . 2 Ca 0 .在4.2-240 K、15 kOe的外磁场和12 kbar的静水压力下研究了8 Mn 1 -xRuxO 3（x=0，0.04和0.08）. Sm 0 . 2 Ca 0 . 8 Mn 0 . 92Ru 0 .在77-280 K和10 kbar的压力范围内研究了0.8O3。结果发现，对于一个原始的阶段（x=0），静水压力增加嵌入在反铁磁矩阵的铁磁畴，并略有降低尼尔温度。压力对磁相互作用的影响取决于Ru掺杂。对于Sm 0 . 2 Ca 0 . 8 Mn 0 . 96Ru 0 . 0 4 O3的外加压力降低居里温度和尼尔温度，但提高铁磁分数。在Sm 0的情况下。2 Ca 0 . 8 Mn 0 . 92Ru 0 . 0 8 O3施加的压力抑制铁磁相互作用，并令人惊讶地增加电阻率。据我们所知，这是第一次在钙钛矿中观察到这种效应。所有上述观察结果都在相分离的背景下进行了讨论。
Magnetic properties of Sm 0 . 2 Ca 0 . 8 Mn 1 - x Ru x O 3 (x=0, 0.04, and 0.08) are investigated in the temperature range 4.2-240 K, external magnetic fields up to 15 kOe and hydrostatic pressure up to 12 kbar. Transport properties of Sm 0 . 2 Ca 0 . 8 Mn 0 . 9 2 Ru 0 . 0 8 O 3 are also investigated in the temperature range 77-280 K and under pressure up to 10 kbar. It is found that for a pristine phase (x=0), hydrostatic pressure increases the ferromagnetic domains embedded in an antiferromagnetic matrix, and slightly decreases the Neel temperature. The effect of pressure on the magnetic interactions depends upon Ru doping. For Sm 0 . 2 Ca 0 . 8 Mn 0 . 9 6 Ru 0 . 0 4 O 3 an applied pressure decreases both Curie and Neel temperatures, but enhances the ferromagnetic fraction. In the case of Sm 0 . 2 Ca 0 . 8 Mn 0 . 9 2 Ru 0 . 0 8 O 3 an applied pressure suppresses the ferromagnetic interactions and surprisingly increases the resistivity. To the best of our knowledge this is the first time that such an effect was observed in perovskites. All of the above observations are discussed in the context of phase separation.