Unusual metamagnetic transitions in Pr0.5Ca0.5Mn0.97Ga0.03O3 studied by pulsed magnetic fields
Unusual metamagnetic transitions in Pr0.5Ca0.5Mn0.97Ga0.03O3 studied by pulsed magnetic fields
复制标题
DOI：
10.1103/physrevb.78.104404
复制
发表时间：
2008-09-01
影响因子：
3.7
通讯作者：
Yoshii, S.
中科院分区：
文献类型：
--
作者：
Ouyang, Z. W.;Nojiri, H.;Yoshii, S.
在掺ga的锰矿石pr0.5 ca0.5 mn0.97 ga0.030 o3中观察到一些不寻常的、有趣的磁现象。首先，在2.5 K时，扫描速率小于1 T/s的传统M(H)测量中观察到的磁化步骤和高原在扫描速率接近10(3)T/s的超快磁场下很容易被抑制。这一特征与在类马氏体情况下磁能和弹性能之间平衡的崩溃有关。其次，零场冷却M(H)曲线包含两个在常规低场磁化测量中未观察到的变磁特征，这可能与伪ce型和ce型反铁磁相共存有关。第三，在一定的磁场和温度组合下，反铁磁相和铁磁相可以共存。温度场相图显示了反铁磁向铁磁转变的最小临界场。指出了与其他磁相分离系统的相似之处。
Several unusual and intriguing magnetic phenomena have been observed in the Ga-doped manganite Pr0.5Ca0.5Mn0.97Ga0.03O3. First, at 2.5 K, the magnetization steps and plateaus observed in the conventional M(H) measurements with a sweep rate of less than 1 T/s are readily suppressed under an ultrafast magnetic field with a sweep rate of similar to 10(3) T/s. This feature is correlated with the collapse of the balance between the magnetic energy and the elastic energy within the martensiticlike scenario. Second, the zero-field cooled M(H) curve consists of two metamagnetic features, which were not observed in the conventional low-field magnetization measurements and might be associated with the coexistence of the pseudo-CE-type and the CE-type antiferromagnetic phases. Third, both the antiferromagnetic and ferromagnetic phases may coexist under certain combinations of the magnetic field and temperature. The temperature-field phase diagram exhibits a minimum critical field for the antiferromagnetic to ferromagnetic transition. Similarities with other magnetic phase-separated systems are pointed out.