Current members of the Strongly Correlated Electron Laboratory at CSU-Fresno (photo taken on 5/12/2009). From left to right: Anna Tretyakov, Dr. Pei-Chun Ho, Dulce Romero, Jonathon Thompson, and Ulises Urbina.
Welcome to Strongly Correlated Electron Laboratory
at California State University, Fresno
(updated on 9/22/2009)
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Current members of the Strongly Correlated Electron Laboratory at CSU-Fresno (photo taken on 5/12/2009). From left to right: Anna Tretyakov, Dr. Pei-Chun Ho, Dulce Romero, Jonathon Thompson, and Ulises Urbina.
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2009 May Symposium:
"Celebration of Research Excellence" hosted by the College of Science and Mathematics, CSU-Fresno
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Dulce Romero and Anna Tretyakov presented "Synthesis and Characterization of Gd and Nd nanoparticles," authors: D. G. Romero, Anna Tretyakov, P.-C. Ho, S. Attar, D. Margosan. |
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Ulises Urbina presented "Instrumentation for Measuring Thermal and Electronic Properties of Strongly Correlated Electron Materials," authors: U. I. Urbina and P.-C. Ho. |
Johnathon Thompson presented "Multiple Specimen Property Measurement Apparatus: 5-Channel Multiplexer," authors: J. Thompson and P.-C. Ho. |
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Current
Group leader
Pei-Chun Ho
MS-graduate students
Dulce G. Romero, Physics
Ulises Urbina, Physics
Undergraduate students
Jonathon Thompson, Physics-majored, junior
Carmin Liagn, Biomedical Physics-majored, junior
past
Undergraduate students
Anna Tretyakov, Chemistry-majored
Smitha Sunny, Biomedical Physics-majored, graduated in 2009
MS-graduate students
Kenia Velasco, Physics
Jamie H. Vargas, Physics, graduated in 2009
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Cryocooler (zero magnetic field, 10K-fridge)
An APD HC-2 cryocooler has the capability to reach temperature as low as ~10 K. Currently it has resistivity probe setup and can monitor four samples for each run. Thermopower, thermal conductivity probe, and 1st-order magnetic susceptometer to match this cryocooler are under construction now.
Calorimeter for a cryocooler
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Lab View program for performing the heat capacity measurements from 12K to 300K. Top left graph displays the temperature history monitored by cryocooler’s thermometer and calorimeter’s thermometer during temperature regulation at each target temperature. Top right graph shows the time dependence of the heat pulse input (red line) and the temperature of calorimeter (light blue dots). After program performed a modified 1-tau relaxation fit (finite pulse width) of the whole trace, heat capacity can be determined. The C (J/K) vs T is displayed in the bottom right graph.
9-tesla superconducting magnet cryogenic system (1.6K-fridge)
A 9 tesla 2” bore superconducting (SC) magnet 1.6 K refrigeration system (Janis Model 9TM-SVM-2-SV-HiEff-15V) arrived the CSU-Fresno campus in January, 2009. This system will be setup for electrical resistivity, magnetic susceptibility, thermopower, thermal conductivity, and specific measurements in the temperature range of 300 K and 1.6 K.
Current status (updated on 9/22/2009): Finished hardware construction and pass all the tests in liquid helium environment.
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Aluminum frame with vibration isolation to support the liquid helium dewar |
1.6K refrigerator and 9-tesla SC magnet on a transportation cart |
An electrical hoist and ceiling track with speed and brake controls for taking out the cryostat or the SC magnet and the magnet support. |
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Fix mounts in the room for the cryostat and magnet support with protection shields. |
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4He gas handling system for 1.6-K refrigerator |
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2-piece liquid helium transfer line from CryoFab |
Home-built diffusion pumping station
The vacuum achieved by this pumping station can be down to at least ~10-5 torr.
Refurbished 4He leak detector Varian 936-70
Model 936-70 performs leak checking to the level of ~ 10-8 std. cc./sec.
Home-built coil winder
The home-built coil winder has controllable speed and is equipped with a precision wire tensioner (Fisher Baker Model 100 Dial-Tension, 30 AWG - 44 AWG). It can be used to make small solenoids for pick up signal or producing small magnetic fields.
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