Giant Hall Resistivity and Magnetoresistance in Cubic Chiral Antiferromagnet EuPtSi
Giant Hall Resistivity and Magnetoresistance in Cubic Chiral Antiferromagnet EuPtSi
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DOI：
10.7566/jpsj.87.023701
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发表时间：
2018-02-15
影响因子：
1.7
通讯作者：
Onuki, Yoshichika
中科院分区：
文献类型：
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作者：
Kakihana, Masashi;Aoki, Dai;Onuki, Yoshichika
EuPtSi 结晶为立方手性结构（P2(1)3，No. 198），与斯格明子结构的 MnSi 的非中心对称空间群相同，在尼尔温度 T-N = 4.05 K 以下反铁磁性有序。2K 时 [111] 方向的磁化强度表明在磁场 H-A1 = 9.2 处有两个变磁转变 kOe 和 H-A2 = 13.8 kOe，并且在 H-c = 26.6 kOe 以上饱和。目前 H-A1 和 H-A2 之间的磁相很可能在 (H, T) 相闭合，并且在 3.6 至 0.5 K 的宽温度范围内观察到。在这个被称为 A 相的磁相中，我们发现了巨大的附加霍尔电阻率 Delta rho(H)(H) 和磁阻 Delta rho(H)，达到 Delta rho(H)(H) = 0.12 mu Omega.cm 和 Delta rho(H) = 1.4 mu Omega.cm 分别。这些发现是针对与[111]和[100]平行的H获得的，但不是针对与[110]和[112]平行的H获得的，揭示了新材料EuPtSi的各向异性行为。
EuPtSi crystallizes in the cubic chiral structure (P2(1)3, No. 198), which is the same as the non-centrosymmetric space group of MnSi with the skyrmion structure, and orders antiferromagnetically below a Neel temperature T-N = 4.05 K. The magnetization at 2K for the [111] direction indicates two metamagnetic transitions at the magnetic fields H-A1 = 9.2 kOe and H-A2 = 13.8 kOe and saturates above H-c = 26.6 kOe. The present magnetic phase between H-A1 and H-A2 is most likely closed in the (H, T) phase and is observed in a wide temperature range from 3.6 to 0.5 K. In this magnetic phase known as the A-phase, we found giant additional Hall resistivity Delta rho(H)(H) and magnetoresistance Delta rho(H), reaching Delta rho(H)(H) = 0.12 mu Omega.cm and Delta rho(H) = 1.4 mu Omega.cm, respectively. These findings are obtained for H parallel to [111] and [100], but not for H parallel to [110] and [112], revealing an anisotropic behavior in the new material EuPtSi.