DyFeO_3的基态和磁相变
Ground state and magnetic phase transitions of orthoferrite DyFeO_3
摘要：
用H \parallel c方法研究了多铁性正铁氧体DyFeO 3单晶的低温热导率（κ）、磁化强度（M）和电极化的强度（P）。当晶体在零磁场中冷却时，M、P和κ都始终表现出不可逆的磁场依赖性。特别地，在500 mK < T \le 2 K的情况下，所有这些性质在增加场的第一次运行时显示出两个转变，但在随后的场扫描中仅存在较高场的转变。此外，超低T（T < 500 mK）κ（H）表现出不同的不可逆性，并且当场向上和向下扫描时只有一个跃迁。所有的结果都表明了一个复杂的低T H-T相图，其中包含了Fe^{3+}自旋的连续磁相变。特别是，基态，在零场冷却到subKelvin温度得到的，被发现是一个未开发的阶段。
英文摘要：
Low-temperature thermal conductivity (κ), as well as magnetization (M) and electric polarization (P), of multiferroic orthoferrite DyFeO_3 single crystals are studied with H \parallel c. When the crystal is cooled in zero field, M, P, and κall consistently exhibit irreversible magnetic-field dependencies. In particular, with 500 mK < T \le 2 K, all these properties show two transitions at the first run of increasing field but only the higher-field transition is present in the subsequent field sweepings. Moreover, the ultra-low-T (T < 500 mK) κ(H) shows a different irreversibility and there is only one transition when the field is swept both up and down. All the results indicate a complex low-T H-T phase diagram involving successive magnetic phase transitions of the Fe^{3+} spins. In particular, the ground state, obtained with cooling to subKelvin temperatures in zero field, is found to be an unexplored phase.
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