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Low Temperature Measurements of Novel Low-Dimensional Systems

Low Temperature Measurements of Novel Low-Dimensional Systems. James R. Maloney James M. Stock. What Are Low Temperatures?. Room Temperature 300 K. Freezing Point of Water 273 K. Liquid Nitrogen 77 K. Liquid Helium 4 K. Our Sample 1.5 K. Absolute Zero 0 K.

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Low Temperature Measurements of Novel Low-Dimensional Systems

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  1. Low Temperature Measurements of Novel Low-Dimensional Systems James R. Maloney James M. Stock

  2. What Are Low Temperatures? Room Temperature 300 K Freezing Point of Water 273 K Liquid Nitrogen 77 K Liquid Helium 4 K Our Sample 1.5 K Absolute Zero 0 K

  3. So What are Low-Dimensional Systems? • 1-D Chains • 2-D Planes

  4. How Can This Make the World A Better Place? • We want better high temperature superconductors • High temperature superconductors have similar characteristics to low-dimensional systems • If we’re going to make progress, we need to understand these systems!

  5. Highly Efficient Virtually Pollution Free

  6. Outline • I. Reaching Low Temperatures • II. Our Samples • III. Properties Under Investigation • IV. Results

  7. I. Reaching Low Temperatures • Designed a cell compatible with a cryogenic probe to house our samples • The probe could be chilled by liquid nitrogen, liquid helium, and evaporative cooling

  8. The Sample Cell

  9. The Cryogenic Probe

  10. LabVIEW is Everywhere Bridge Balancing Method Capacitance Bridge Lock-In Amplifier Signal Generator (Internal) Sample

  11. II. Our Samples • (CH3)2NH2CuCl3 ‘MCCL’

  12. II. Our Samples • Langmuir-Blodgett (LB) film

  13. III. Properties Under Investigation • Search for phase transitions of MCCL • By observing capacitance • Look at the conductivity of LB film • Measuring conductance from the capacitance signal

  14. IV. Results • MCCL

  15. IV. Results • LB film

  16. IV. Results • Aluminum

  17. What Is Next? • Reproducibility of 154 K MCCL transition • Search for second phase transition surrounding 10 K • Investigate possible noise coupling between cavities

  18. Questions?

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