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arXiv 1608.06359cond-mat.str-el
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Cu $_2$ OSeO $_3$中Skyrmion晶格相的热稳定性和不可逆性

Thermal stability and irreversibility of skyrmion-lattice phases in Cu$_2$OSeO$_3$

Koya Makino, Johannes D. Reim, Daiki Higashi, Daisuke Okuyama, Taku J. Sato, Yusuke Nambu, Elliot P. Gilbert, Norman Booth, Shinichiro Seki, Yoshinori Tokura

摘要:

用小角中子散射方法研究了Cu $_2$ OSeO $_3$中Skyrmion晶格相的热力学稳定性。我们发现,两个不同的skyrmion晶格相[SkX(1)和SkX(2)相]可以通过不同的热历史稳定;通过在有限磁场下从顺磁相冷却,选择SkX(2)相。另一方面,通过在有限场下从有序锥形相加热样品,30 $^{\circ}$旋转的SkX(1)相变得占主导地位。这种稳定性的差异令人惊讶地类似于在自旋玻璃中观察到的不可逆性。零场冷却导致两相共存。进一步发现,一旦其中一个skyrmion晶格相形成,它几乎不稳定。这表明不寻常的热稳定性的两个skyrmion晶格相源自它们之间的一个意想不到的大的能量障碍。

英文摘要:

Small angle neutron scattering measurements have been performed to study the thermodynamic stability of skyrmion-lattice phases in Cu$_2$OSeO$_3$. We found that the two distinct skyrmion-lattice phases [SkX(1) and SkX(2) phases] can be stabilized through different thermal histories; by cooling from the paramagnetic phase under finite magnetic field, the SkX(2) phase is selected. On the other hand, the 30$^{\circ}$-rotated SkX(1) phase becomes dominant by heating the sample from the ordered conical phase under finite field. This difference in stabilization is surprisingly similar to the irreversibility observed in spin glasses. The zero-field cooling results in the co-existence of the two phases. It is further found that once one of the skyrmion-lattice phases is formed, it is hardly destabilized. This indicates unusual thermal stability of the two skyrmion-lattice phases originating from an unexpectedly large energy barrier between them.

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