Odd-parity magnetoresistance in pyrochlore iridate thin films with broken time-reversal symmetry.
Odd-parity magnetoresistance in pyrochlore iridate thin films with broken time-reversal symmetry.
复制标题
pyrochlore中的奇数磁磁性液化薄膜，具有破碎的时间反转对称性。
DOI：
10.1038/srep09711
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发表时间：
2015-05-11
影响因子：
4.6
通讯作者：
Kawasaki M
中科院分区：
文献类型：
--
作者：
Fujita TC;Kozuka Y;Uchida M;Tsukazaki A;Arima T;Kawasaki M
一类被称为拓扑绝缘体的新型材料由于其独特的狄拉克表面态携带无耗散边自旋流而受到广泛的研究。最近，理论上提出了这种能带结构的三维模拟，即Weyl半金属相，是在具有强烈的自旋-轨道耦合的焦绿石氧化物中实现的，并伴随着All-In-All-Out自旋有序。在这里，我们报道了Eu2Ir2O7单晶薄膜的制备和磁输运。我们发现，通过时间反转操作连接的两种简并的All-In-All-Out结构中的一种，可以由冷却磁场的极性选择性地形成。一旦形成，磁区对相反极化的磁场是健壮的，这从磁阻中不寻常的奇场相关项和霍尔电阻中的反常项中得到了证明。我们的发现为探索在烧绿石虹彩的表面/界面或磁畴壁上预测的新的量子输运现象铺平了道路。
A new class of materials termed topological insulators have been intensively investigated due to their unique Dirac surface state carrying dissipationless edge spin currents. Recently, it has been theoretically proposed that the three dimensional analogue of this type of band structure, the Weyl Semimetal phase, is materialized in pyrochlore oxides with strong spin-orbit coupling, accompanied by all-in-all-out spin ordering. Here, we report on the fabrication and magnetotransport of Eu2Ir2O7 single crystalline thin films. We reveal that one of the two degenerate all-in-all-out domain structures, which are connected by time-reversal operation, can be selectively formed by the polarity of the cooling magnetic field. Once formed, the domain is robust against an oppositely polarised magnetic field, as evidenced by an unusual odd field dependent term in the magnetoresistance and an anomalous term in the Hall resistance. Our findings pave the way for exploring the predicted novel quantum transport phenomenon at the surfaces/interfaces or magnetic domain walls of pyrochlore iridates.
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影响因子：
56.9
作者：
Bernevig, B. Andrei;Hughes, Taylor L.;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
56.9
作者：
Koenig, Markus;Wiedmann, Steffen;Zhang, Shou-Cheng
通讯作者：
Zhang, Shou-Cheng
影响因子：
3.7
作者：
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通讯作者：
Kuga, Shun-ichi
影响因子：
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作者：
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通讯作者：
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影响因子：
8.6
作者：
Takahashi, K. S.;Onoda, M.;Tokura, Y.
通讯作者：
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