Bose glass and Mott glass of quasiparticles in a doped quantum magnet

Rong Yu, Liang Yin, Neil S. Sullivan, J. S. Xia, Chao Huan, Armando Paduan-Filho, Nei F. Oliveira, Stephan Haas, Alexander Steppke, Corneliu F. Miclea, Franziska Weickert, Roman Movshovich, Eun-Deok Mun, Brian L. Scott, Vivien S. Zapf and Tommaso Roscilde ()
Additional contact information
Rong Yu: Rice University
Liang Yin: University of Florida
Neil S. Sullivan: University of Florida
J. S. Xia: University of Florida
Chao Huan: University of Florida
Armando Paduan-Filho: Instituto de Fisica, Universidade de São Paulo
Nei F. Oliveira: Instituto de Fisica, Universidade de São Paulo
Stephan Haas: University of Southern California
Alexander Steppke: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany
Corneliu F. Miclea: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Franziska Weickert: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Roman Movshovich: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Eun-Deok Mun: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Brian L. Scott: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Vivien S. Zapf: Condensed Matter and Magnet Science, Los Alamos National Laboratory
Tommaso Roscilde: Laboratoire de Physique, Ecole Normale Supérieure de Lyon, CNRS UMR5672, 46 Allée d’Italie, 69364 Lyon, France

Nature, 2012, vol. 489, issue 7416, 379-384

Abstract: Abstract The low-temperature states of bosonic fluids exhibit fundamental quantum effects at the macroscopic scale: the best-known examples are Bose–Einstein condensation and superfluidity, which have been tested experimentally in a variety of different systems. When bosons interact, disorder can destroy condensation, leading to a ‘Bose glass’. This phase has been very elusive in experiments owing to the absence of any broken symmetry and to the simultaneous absence of a finite energy gap in the spectrum. Here we report the observation of a Bose glass of field-induced magnetic quasiparticles in a doped quantum magnet (bromine-doped dichloro-tetrakis-thiourea-nickel, DTN). The physics of DTN in a magnetic field is equivalent to that of a lattice gas of bosons in the grand canonical ensemble; bromine doping introduces disorder into the hopping and interaction strength of the bosons, leading to their localization into a Bose glass down to zero field, where it becomes an incompressible Mott glass. The transition from the Bose glass (corresponding to a gapless spin liquid) to the Bose–Einstein condensate (corresponding to a magnetically ordered phase) is marked by a universal exponent that governs the scaling of the critical temperature with the applied field, in excellent agreement with theoretical predictions. Our study represents a quantitative experimental account of the universal features of disordered bosons in the grand canonical ensemble.

Date: 2012
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DOI: 10.1038/nature11406

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