Experimental Investigation of Magnetic Superconducting and other Phase Transitions in Novel f-Electron Materials at Ultra-high Pressures using Designer Diamond Anvils

Technical Report · Wed Sep 01 04:00:00 EDT 2004

DOI:https://doi.org/10.2172/828899· OSTI ID:828899

Maple, M Brian ^[1]; Jeffries, Jason R; Ho, Pei-Chun; Butch, Nicholas P

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1. University of California, San Diego

Pressure is often used as a controlled parameter for the investigation of condensed matter systems. In particular, pressure experiments can provide valuable information into the nature of superconductivity, magnetism, and the coexistence of these two phenomena. Some f-electron, heavy-fermion materials display interesting and novel behavior at moderately low pressures achievable with conventional experimental techniques; however, a growing number of condensed matter systems require ultrahigh pressure techniques, techniques that generate significantly higher pressures than conventional methods, to sufficiently explore their important properties. To that end, we have been funded to develop an ultrahigh pressure diamond anvil cell facility at the University of California, San Diego (UCSD) in order to investigate superconductivity, magnetism, non-Fermi liquid behavior, and other phenomena. Our goals for the first year of this grant were as follows: (a) set up and test a suitable refrigerator; (b) set up a laser and spectrometer fluorescence system to determine the pressure within the diamond anvil cell; (c) perform initial resistivity measurements at moderate pressures from room temperature to liquid helium temperatures ({approx}1K); (d) investigate f-electron materials within our current pressure capabilities to find candidate materials for high-pressure studies. During the past year, we have ordered almost all the components required to set up a diamond anvil cell facility at UCSD, we have received and implemented many of the components that have been ordered, we have performed low pressure research on several materials, and we have engaged in a collaborative effort with Sam Weir at Lawrence Livermore National Lab (LLNL) to investigate Au4V under ultrahigh pressure in a designer diamond anvil cell (dDAC). This report serves to highlight the progress we have made towards developing an ultrahigh pressure research facility at UCSD, the research performed in the past year, as well as future directions we plan to pursue.

• Research Organization: The Regents of the University of California, San Diego, CA
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: FG52-03NA00068
• OSTI ID: 828899
• Report Number(s): DOENA00068 1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CALIFORNIA
DAC
DIAMONDS
FLUORESCENCE
HELIUM
LASERS
MAGNETISM
SPECTROMETERS
SUPERCONDUCTIVITY
dDAC
designer diamond anvil cell
diamond anvil cell
f-electron materials
filled skutterudites
magnetism
non-Fermi liquid
superconductivity
ultrahigh pressure