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Introduction to the NHMFL Pulsed Field Facility at LANL

Information on the physical set-up of pulsed field measurements

Read about lock-in amplifiers and their role in your measurements

Information about noise and ways to eliminate it from your measurements

How to collect and evaluate your measurement data

Information on optical spectroscopy

Information about time-resolved optics

Information on de Haas van Alphen Effect measurements

Information on Shubinkov de Haas Effect measurements

Information on Absolute Resistivity measurements

Information on Heat Capacity measurements

Information on RF Penetration Depth measurements

Mechanical Noise


Mechanical vibration can generate electrical interference if magnetic fields are present. Capacitance changes associated with vibrating wires also lead to strange interference signals. Note that vibrating wires on the probe produce a quadrature signal proportional to . Make sure that all wires, especially those located near the magnet are tied down as tightly as possible, and that the system is well isolated from vibrations.

Especially important is assuring that the small gold, or platinum wires connecting the sample to the probe wires are held fast with some sort of adhesive grease.

The cryogens help damp out mechanical vibrations. It sometimes helps to bring the helium bath above the lambda point when making low temperature measurements. The normal state liquid helium damps out mechanical vibrations, whereas superfluid helium does not.