Suppressed magnetic order and non-Fermi-liquid behavior in MnSi thin films under hydrostatic pressure
Suppressed magnetic order and non-Fermi-liquid behavior in MnSi thin films under hydrostatic pressure
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静水压力下 MnSi 薄膜中的抑制磁序和非费米液体行为
DOI：
10.1103/physrevb.89.144413
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发表时间：
2014
影响因子：
3.7
通讯作者：
H. Amitsuka
中科院分区：
文献类型：
--
作者：
J. Engelke;D. Menzel;H. Hidaka;T. Seguchi;H. Amitsuka
在MNSI薄膜中，B20化合物的磁性受感生单轴各向异性的影响。与块体MnSi相比，磁相图中的临界磁场增强，Skyrmion相增大。此外，对于10 nm左右的薄膜，其有序温度取决于薄膜厚度达到43K，并且明显高于大块晶体中的薄膜厚度({T}_c，\mathm{Bulk}}=29$K)。在体相MNSI中，有序温度可以通过加压降低，在1.46 GPa时，磁序被完全抑制，并且观察到了以电阻率规律为特征的非费米液体行为。我们介绍了在高达3.44 Gpa的外加压力下对MnSi薄膜进行的电阻测量。在性质上，其行为类似于批量MNSI。然而，临界压力相当大地增加到3.1 Gpa，这被认为是应变的结果。在高压下，观察到高达30$K的非费米液体行为，即在比体相MNSI更宽的温度范围内观察到电阻的非费米行为。单轴各向异性可能在费米液体行为的这种破坏中起到重要作用，因为它稳定了非平凡的自旋结构。
In MnSi thin films the magnetic properties of the B20 compound are influenced by induced uniaxial anisotropy. In comparison to bulk MnSi the critical magnetic fields are enhanced and the Skyrmion phase is found to be enlarged within the magnetic phase diagram. Furthermore the ordering temperature depends on the film thickness reaching 43 K for films of around 10 nm and is considerably higher than in bulk crystals (${T}_{c,\mathrm{bulk}}=29$ K). In bulk MnSi the ordering temperature can be reduced by pressure, where at 1.46 GPa the magnetic order is completely suppressed and a non-Fermi-liquid behavior characterized by a ${T}^{3/2}$ law of the resistivity is observed. We present resistance measurements on MnSi thin films under applied pressure of up to 3.44 GPa. Qualitatively, the behavior is similar to bulk MnSi. However, the critical pressure is considerably enhanced to 3.1 GPa, which is assumed to be a consequence of strain. At high pressure non-Fermi-liquid behavior evidenced by a ${T}^{3/2}$ behavior of the resistance is observed up to ${T}_{\mathrm{lin}}=30$ K, i. e., in a larger temperature range than for bulk MnSi. Uniaxial anisotropy might play an important role in this breakdown of Fermi-liquid behavior, since it stabilizes nontrivial spin structures.