High Magnetic Field Susceptibility Measurements for BaCuSi$_2$O$_6$

ORAL

Abstract

We have measured the change in magnetic susceptibility of the spin gap system BaCuSi$_2$O$_6$ at high magnetic fields (33T) utilizing the change in the resonant frequency of a tunnel diode oscillator (TDO). At temperatures below T$\sim$3K, measurements reveal the presence of a critical field H$_{c1}$, characterized by a jump in magnetic susceptibility. The evolution of H$_{c1}$ with temperature is in good agreement with the previous magnetization and specific heat measurements and with the theoretical predictions for the realization of Bose-Einstein condensate by the spin system of Cu$^{2+}$ dimers. This technique provides the opportunity for future investigation of this material at high pressures.

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Authors

  • Kenneth Purcell

  • Catalin Martin

  • Timothy Murphy

  • Eric Palm

  • Stanley Tozer

    • NHMFL-FSU
    • National High Magnetic Field Laboratory, FSU, Tallahassee, FL
    • National High Magnetic Field Laboratory, Florida State University

  • S. E. Sebastian

  • I. R. Fisher

    • Stanford University