- Description:
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The Leiden Institute of Physics is out to purchase a state-of-the-art/turn-key "cryogen-free measurement system" for low temperature electrical transport and magnetic properties in van der Waals heterostructures, magnetic-superconducting devices and testing scanning probe microscopes. For these investigations, the apparatus must have proven reliability, high throughput and withstand intense use by several research groups, with virtually no down-time from the moment of installation.
After an exhaustive market analysis we conclude that Quantum Design GmbH (QD) is the only vendor that provides an apparatus with all the technical capabilities to meet our scientific requirements (listed under) and with unmatched reputation and customer satisfaction in the scientific community. The most relevant work and the highest sensitivity electrical and magnetic measurements in the literature are systematically performed in QD "PPMS" systems. - We aim to the best temperature stability for the longer time possible for transport, critical current, magnetic measurements and testing of scanning probes. The apparatus should provide fully automated temperature control without the use of any mechanical needle-valve. It must be equipped with dual impedance: one for primary gas flow and a secondary fine flow of gas/liquid. The temperature stability at 2K must be at least 2mK, attainable for a long time without any drift or oscillation. The temperature must not have any disturbance at the helium boiling and lambda points.
- We require options such as DC/AC resistivity, pressure cell for electrical transport that operates with "cryogenic oil" up to at least 2GPa, a multi-function probe for custom measurements, a 360- degrees horizontal sample rotator with high step resolution (at least 0.0015 degrees/step), and VSM for at least 9 mm samples with a noise floor of at least 6.0x10-7 emu. All these options should operate in the temperature range 1.8K-400K and in a vertical magnetic field up to +/-9T (homogeneity ±0.01 % over 3 cm on-axis).
- Because of a combination of software portability, licensing and performance, we require state-of-the-art CAN interface without GPIB and no third-party platforms like LabView.
- In order to achieve the highest sensitivity, sample holders and probes that are inside the magnetic field region must be made of materials that suppress Eddy currents, like CuBe, and gold coated without magnetic impurities to avoid magnetic background.
- Type:
- Unsealed
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