REFeAsO中RE晶格的磁序：Sm的奇数情况。强磁场中的specific heat研究
Magnetic ordering of the RE lattice in REFeAsO: the odd case of Sm. A specific heat investigation in high magnetic field
摘要：
本文研究了SmFeAsO多晶样品在磁场高达35 T的条件下低温比热反常（零场TN=5.4K）的演化。异常仍然非常尖锐，高达16 T，并在更高的领域变得圆润，温度变化不大。掺杂（超导）SmFeAsO_（0.85）F_（0.15）样品在16 T下表现出类似的行为。未掺杂SmFeAsO的临界场dBc/dT的初始斜率为160 T/K，掺杂SmFeAsO_（0.85）F_（0.15）的临界场dBc/dT的初始斜率为70 T/K，Bc（T）定义在比热异常的峰值处。对外加磁场的不敏感性是Sm所特有的，而在CeFeAsO中没有观察到，CeFeAsO的异常以dBc/dT=5.7T/K的初始斜率移动。我们认为，SmFeAsO（F）提出了一个前所未有的情况下，在反铁磁转变的自旋重新取向。
英文摘要：
We have investigated the evolution of the low temperature specific heat anomaly (TN=5.4K in zero field) in polycrystalline SmFeAsO samples with magnetic fields up to 35T. The anomaly remains very sharp up to 16T and becomes rounded with little shift in temperature at higher fields. Doped (superconducting) SmFeAsO0.85F0.15 sample shows a similar behavior up to 16T. The initial slope of the critical field dBc/dT is 160T/K for undoped SmFeAsO and 70T/K for doped SmFeAsO0.85F0.15, with Bc(T) defined at the peak of the specific heat anomaly. The insensitivity to the application of an external magnetic field is unique to Sm and is not observed in CeFeAsO whose anomaly shifts with initial slope dBc/dT=5.7T/K. We argue that SmFeAsO(F) presents an unprecedented case of spin reorientation at the antiferromagnetic transition.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
