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S. Takahashi, I. S. Tupitsyn, J. van Tol, C. C. Beedle, D. N. Hendrickson, and P. C. E. Stamp,

Decoherence in Crystals of Molecular Magnets Gregory S. Boebinger, Florida State University, DMR 0654118 Electron Magnetic Resonance Facility.

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S. Takahashi, I. S. Tupitsyn, J. van Tol, C. C. Beedle, D. N. Hendrickson, and P. C. E. Stamp,

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  1. Decoherence in Crystals of Molecular MagnetsGregory S. Boebinger, Florida State University, DMR 0654118Electron Magnetic Resonance Facility Decoherence remains a major obstacle for implementation of molecular materials in quantum computing and information storage applications. In this low-temperature study of crystals containing Fe8 molecular magnets, high magnetic fields were employed to suppress two major sources of decoherence: 1. molecular spin-spin interactions; and 2. electron-nuclear hyperfine interactions. Newly developed theoretical methods were then employed to precisely calculate the influence of both the applied magnetic field strength and the temperature on these sources of decoherence. Remarkable agreement was achieved with the decoherence times determined experimentally using a unique high-frequency (240 GHz) pulsed EPR spectrometer at the NHMFL. (Left) The Fe8 quantum molecular magnet. The 120/240/ 336 GHz quasi-optical pulsed EPR spectro-meter at the NHMFL. S. Takahashi, I. S. Tupitsyn, J. van Tol, C. C. Beedle, D. N. Hendrickson, and P. C. E. Stamp, Nature 476, 76 (2011).

  2. Decoherence in Crystals of Molecular MagnetsGregory S. Boebinger, Florida State University, DMR 0654118Electron Magnetic Resonance Facility CuF2(pyz)(H2O)2 A new method has been developed to perform high-field / high-frequency Electron Paramagnetic Resonance (EPR) measurements of single-crystal samples of molecular magnets under large hydrostatic pressures (up to 30 kbar). This new capability has become available to users of the NHMFL EMR facility, with the first successful results obtained by a user being presented at an international workshop in April 2010. This technique is of particular interest to researchers working in the molecular magnetism community. a b a c Pressure dependence of the g-tensor for a molecular magnetic framework material. Chelsey Morien presents her results at the International School and Symposium on Multifunctional Molecule-based Materials at Argonne National Lab, March, 2011. S. Takahashi, I. S. Tupitsyn, J. van Tol, C. C. Beedle, D. N. Hendrickson, and P. C. E. Stamp, Nature 476, 76 (2011).

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