Aluminum and boron nuclear quadrupole resonance with a direct current superconducting quantum interference device
نویسندگان
چکیده
We report the application of our dc SQUID (superconducting quantum interference device) spectrometer [C. Connor, J. Chang, and A. Pines, Rev. Sci. Instrum. 61, 1059( 1990)] to nuclear quadrupole resonance (NQR) studies of aluminum-27, and boron-II in crystalline and glassy solids. Our results give eqQ /h = 2.38 MHz and 1] = 0.0 for a-A120 3 at 4.2 K. For the natural mineral petalite (LiAISi4 010)' we obtain e qQ /h = 4.56 MHz and 1] = 0.47. The quadrupole resonance frequency is 1467 kHz in boron nitride, and in the vicinity of 1300 kHz for various borates in the B20 3 . xH2 0 system. The distribution of boron environments in a B20 3 glass gives rise to a linewidth of about 80 kHz in the SQUID detected resonance.
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