配件选项

样品杆

样品测量杆有标准固定样品杆和机械旋转样品杆两种类型。这些样品杆是电学输运测量和量子霍尔效应测量的理想选择，适用范围从直流电测量到GHz电磁频率测量。具有可拆卸的样品支架，用于面内和面外的测量，ESD保护和探测屏蔽。

每种样品杆均可用于气氛氛围中或者真空环境中，样品杆的底盘由3根薄壁无磁不锈钢管连接，构成刚性、笔直和低热导率的结构，形成电气隔离空间，以屏蔽系统探测和控制接线对样品测量信号的影响。

干式氦三插件

样品置于真空环境，³He制冷机可获得低于300 mK的温度，并能保持40hrs以上，在350 mK具备50 μW的制冷功率，并能保持6hrs以上。HelioxVT适配50mm孔径的低温交换气环境，无需液氦预冷。

干湿两用稀释制冷插杆

KelvinoxJT是一款小型量油计型稀释制冷机，具有Joule-Thomson冷凝单元。因为KelvinoxJT不需要1 K冷池，这意味着可以在任何4 K环境中运行，无论湿式还是干式的。

具有宽广的温度区间：在VTI中使用时，温度可以控制在25mK至300K，最快可在6小时左右从室温快速降到最低温度。

样品保护

样品保护系统使用端对端的方法来保护敏感样品免受偶然静电放电（ESD）损伤，该系统包括安装在机箱上的样品保护开关单元（SPSU），通过测量级线缆和样品杆，与含有等电位插头附加插座的样品座相连接。

量子反常霍尔效应

☛ 拓扑绝缘体能在其表面表现出无损导电性，这可能实现更高效的电子器件。

☛ 拓扑保护的量子态也可以用于容错量子计算。

☛ 作者研究了由本征磁性拓扑绝缘体锰铋碲（MnBi₂Te₄）制成的五层单晶中磁场诱导的量子反常霍尔效应（QAHE）。

☛ 作者使用TeslatronPT调节磁场和温度的过程中测量了纵向（Rxx）和横向（Ryx）电阻。

☛ 这是首个展示量子反常霍尔效应的本征磁性拓扑绝缘体。

Deng et al Science 21 Feb 2020: Vol. 367, Issue 6480, pp. 895-900

三维量子霍尔效应

☛ 作者报道了首个三维量子霍尔效应（3D QHE）的明确实验证据。

☛ 使用体块ZrTe5晶体实现所需的超低载流子密度和超高迁移率。

☛ 在1.5特斯拉的磁场下，他们测量到无耗散的纵向电阻率和建立的霍尔电阻率平台。

☛ 在更高磁场下，他们发现了金属-绝缘体转变，代表了一种新型的由磁场驱动的量子相变。

☛ 使用带机械旋转杆的TeslatronPT在低至1.5K下进行了测量。使用HelioxVL在低至260mK下进行了测量。

Tang et al Nature volume 569, pages 537–541(2019)

使用扫描SQUID显微镜的边缘超导性

☛ 理解边缘超导性对于未来在超导自旋电子学和拓扑量子计算中的潜在应用至关重要。

☛ 作者在TeslatronPT上安装了带有附加振动阻尼的扫描SQUID显微（SSM）探头。

☛ 作者对超导Fe(Se,Te)中的超电流分布和局部超流密度进行成像。

☛ 研究发现体相超导性显著受抑，而边缘仍保持强烈的超导抗磁性。

☛ 超流密度和超电流分布的温度依赖性在边缘和体相之间表现出明显的差异。

Jiang et al Science Bulletin Vol. 66, Issue 5, 15 March 2021, Pages 425-432

图 1 通用测量样品杆（样品在气态环境中）装在冷的变温腔（VTI）中

图 2 变温腔和样品杆温度控制和升温/降温循循环

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