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Bose Glass of Quasiparticles in Doped Quantum Magnet Gregory S. Boebinger, Florida State University, DMR 0654118 High B/T Facility & Pulsed Field Facility.

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  1. Bose Glass of Quasiparticles in Doped Quantum MagnetGregory S. Boebinger, Florida State University, DMR 0654118High B/T Facility & Pulsed Field Facility When a quantum-mechanical wave is subject to disorder, it can break into pieces that are no longer coherently in phase with each other. This phenomena is important in superconductivity, Bose-Einstein condensation (BEC), superfluids, electrical conduction, etc. Here we test the leading theory for this effect in waves of bosons. The quantum magnet dichloro-tetrakis-thiourea-nickel (Br-DTN) forms magnetic order that is equivalent to a BEC. This BEC can localize in the presence of disorder caused by Br-doping to form a Bose Glass. The BEC-Bose Glass (BEC-BG) transition can be carefully controlled by magnetic field, allowing us to sensitively probe its properties and test the theory of boson localization. We measure heat capacity at the MagLab’s Pulsed Field Facility at Los Alamos and magnetic susceptibility down to 1 mK at the MagLab’s High B/T Facility at the University of Florida. Our experiments of the scaling of the BEC-BG transition, agree well with our simulations, but surprisingly refute the leading theory for disordered bosons on a lattice. R. Yu, L. Yin, N. S. Sullivan, J. S. Xia, C. Huan, A. Paduan-Filho, N. F. Oliveira Jr., S. Haas, A. Steppke, C. F. Miclea, F. Weickert, R. Movshovich, E.-D. Mun, B. Scott, V. S. Zapf, and T. Roscilde, Nature in Press. (b) • AC susceptibility of Br-DTN close to lower and upper critical fields (marked by arrows), (b) magnetization as a function of field showing agreement with Quantum Monte Carlo calculations (QMC), (c) specific heat measurements of Br-DTN to 2 T, and (d) fit of non-exponential decay of specific heat using a local-gap model (LGM).

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