Introduction

These facilities serve to probe quantum materials at ultra-cold temperatures and high magnetic fields, utilizing magnetic field direction as a standard probe of anisotropy in strongly correlated electron systems. In conjunction with the use of CNAM central facilities, this equipment promises to provide unparalled insight into the details of

One of the main experimental components is an Oxford 3He/4He dilution refrigeration system. This is equipped with a 17 T single-axis superconducting magnet and mechanical rotation stage. In addition, several insert adapters optimized for high-frequency experiments are included to allow versatility in the type and range of experiment performed at low temperatures.

Measurement Lab

The main components of the lab include:

• 0.015 K base temperature Oxford ³He/⁴He dilution refrigeration system
• 1.5 K base temperature ⁴He 'dipping' refrigeration system
• 17 T Oxford Instruments single-axis superconding magnet system
• 5T/7T two-axis double solenoid superconducting vector magnet

These are being prepared to be housed in an electrically sheilded metal room (described below) in order to eliminate noise and unwanted heating effects of RF radiation.

17 T Single-Axis Magnet System

The Oxford Instruments 15T/17T magnet is constructed from a Nb³Sn coil wound around a 2" experimental bore and is designed to operate in persistent or swept mode up to 15 T at 4.2 K and 17 T at 2.2 K. Euipped with a fully field-compensated zone to enable in-situ calibration of experimental thermometry regardless of field strength, this magnet is the "workhorse" for performing high-field thermodynamic and transport measurements in both fixed-angle and one-axis rotatable field-experiment angle configurations.

EMF Screened Room

Ultra-low temperature experiments will be housed in a 12' x 17'  EMF screened room equipped with a 6' cryostat pit. This "steel cage" is capable of 100 dB attenuation down to kHz frequencies, and is electrically isolated from surrounding building grounds. Two- and three-phase electrical power is supplied to the room through filters which prevent conducted signals from entering the enclosure, and a single-source true "earth" ground running from outside of the building provides electrical grounding of the cage and its internal power sources, eliminating noise and interference from ground loops.Custom vacuum lines have been built to connect cryostats to helium circulation pumps place in a remote location.

Copper-Clad Screening Panels

In order to accomodate the placement of the superconducting magnetics inside the screened room, it was necessary to install special non-magnetic copper-clad panels in the walls and floor of the pit area in order to maintain the EMF screening and prevent magnetic forces from disturbing magnet placement.

Vibration Isolation Methods

The helium circulation system used for the dilution refrigeration cryostat is driven by rotary and booster pumps situated in a pit well removed from the experimental environment, ensuring isolation of mechanical and acoustic vibration problems.

Preparation Lab

For sample and experiment preparation, a separate lab space will be equipped with:

• microscopes
• soldering stations
• cutting and polishing facilities
• chemical preparation