Combinatorial Hall Effect System for Oxide Films

ORAL

Abstract

Combinatorial film growth techniques have made it possible to produce large numbers of high-quality oxide films at one time. Characterizing the samples by traditional methods would be far too slow. Certain measurements, such as the Hall effect, require careful temperature control and lock-in amplifiers to resolve the small signal. We have just built a complete system for measuring the Hall effect in 32 samples simultaneously. The system consists of our home-built, 32-channel lock-in amplifier system, a gas-flow cryostat with a pogo-pin array, a 1 Tesla electromagnet, computerized data acquisition and temperature control, and a specially-built multiplexer to reconfigure the sample leads to allow resistivity measurements. Test show that the system show a good voltage resolution of 15~nV with typical signals of 1~$\mu$V. We hope to show data from a series of La$_{\rm 2-x}$Sr$_{\rm x}$CuO$_{\rm 4}$ samples.

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Authors

  • Bryan Kerns

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron

  • Hyeonjae Kim

    NASA Johnson Space Center, Ursinus College, Purdue University Calumet, University of Notre Dame, GSI, Germany, Florida State University, Ohio Wesleyan University, Department of Physics, The University of Akron, Physics Department, Cleveland State University, Wright State University, Cornell University, Johannes Gutenberg Universit{\"a}t Mainz, Brookhaven National Laboratory, Miami University, Case Western Reserve University, Harvey Mudd College, Univ. Akron, Dept. of Geology and Physics, Lock Haven University of Pennsylvania, The University of Akron