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首页> 外文期刊>Physical review >Spin dynamics in IrSr_2Sm_(1.15)Ce_(0.85)Cu)2O_(10): Complex magnetic behavior in a layered iridocuprate
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Spin dynamics in IrSr_2Sm_(1.15)Ce_(0.85)Cu)2O_(10): Complex magnetic behavior in a layered iridocuprate

机译：IrSr_2Sm_（1.15）Ce_（0.85）Cu）2O_（10）中的自旋动力学：层状iridocuprate中的复杂磁行为

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摘要

A muon spin rotation (/iSR), neutron, and synchrotron diffraction study of the reentrant spin-glass material IrSr_2Sm_(1.15)Ce_(0.85)Cu)2O_(10) is presented. The synthesis has been optimized, and Rietveld refinement of the diffraction patterns shows no sign of the previously reported Ir/Cu cation exchange but confirms the structure along with the disordered tilts and rotations of IrO6 octahedra. The zero-field-μSR response indicates a complex temperature dependence to the magnetism with multiple transitions that are confirmed to be bulk phenomena. Consecutive transitions are reported at t_1 = 140, t_2 = 20, and t_3 = 6 K. The broad transition at 140 K is assigned to antiferromagnetic ordering of Ir~(4+) spins with a stripe spin structure. The low-temperature transitions are a result of antiferromagnetic ordering of Cu~(2+) spins followed by the freezing of a disordered Ir spin component, further evidenced by a strong damping of the oscillation amplitude below 6 K. These observations confirm the bulk nature of the previously reported reentrant spin-glass behavior of this complex magnetic system.
机译：提出了重入自旋玻璃材料IrSr_2Sm_（1.15）Ce_（0.85）Cu）2O_（10）的μ自旋旋转（/ iSR），中子和同步加速器衍射研究。合成得到了优化，衍射图的Rietveld精炼没有显示以前报道的Ir / Cu阳离子交换的迹象，但证实了结构以及IrO6八面体的无序倾斜和旋转。零磁场-μSR响应表明，磁性对温度的复杂依赖性具有多个转变，这些转变已被确认是整体现象。据报道连续转变在t_1 = 140，t_2 = 20和t_3 = 6K。140K处的宽转变被赋予具有条带自旋结构的Ir〜（4+）自旋的反铁磁有序。低温转变是Cu〜（2+）自旋反铁磁有序的结果，然后冻结了无序的Ir自旋组分，进一步证明是在6 K以下的振荡振幅有很强的阻尼。这些观察结果证实了整体性质复杂的磁系统先前报道的可重入自旋玻璃行为。

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