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

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 amore » quantitative experimental account of the universal features of disordered bosons in the grand canonical ensemble.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Univ. of Southern California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1564845
DOE Contract Number:  
FG02-05ER46240; FG03-01ER45908
Resource Type:
Journal Article
Journal Name:
Nature (London)
Additional Journal Information:
Journal Volume: 489; Journal Issue: 7416; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

Citation Formats

Yu, Rong, Yin, Liang, Sullivan, Neil S., Xia, J. S., Huan, Chao, Paduan-Filho, Armando, Oliveira Jr, Nei F., Haas, Stephan, Steppke, Alexander, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, Mun, Eun-Deok, Scott, Brian L., Zapf, Vivien S., and Roscilde, Tommaso. Bose glass and Mott glass of quasiparticles in a doped quantum magnet. United States: N. p., 2012. Web. doi:10.1038/nature11406.
Yu, Rong, Yin, Liang, Sullivan, Neil S., Xia, J. S., Huan, Chao, Paduan-Filho, Armando, Oliveira Jr, Nei F., Haas, Stephan, Steppke, Alexander, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, Mun, Eun-Deok, Scott, Brian L., Zapf, Vivien S., & Roscilde, Tommaso. Bose glass and Mott glass of quasiparticles in a doped quantum magnet. United States. https://doi.org/10.1038/nature11406
Yu, Rong, Yin, Liang, Sullivan, Neil S., Xia, J. S., Huan, Chao, Paduan-Filho, Armando, Oliveira Jr, Nei F., Haas, Stephan, Steppke, Alexander, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, Mun, Eun-Deok, Scott, Brian L., Zapf, Vivien S., and Roscilde, Tommaso. Sat . "Bose glass and Mott glass of quasiparticles in a doped quantum magnet". United States. https://doi.org/10.1038/nature11406.
@article{osti_1564845,
title = {Bose glass and Mott glass of quasiparticles in a doped quantum magnet},
author = {Yu, Rong and Yin, Liang and Sullivan, Neil S. and Xia, J. S. and Huan, Chao and Paduan-Filho, Armando and Oliveira Jr, Nei F. and Haas, Stephan and Steppke, Alexander and Miclea, Corneliu F. and Weickert, Franziska and Movshovich, Roman and Mun, Eun-Deok and Scott, Brian L. and Zapf, Vivien S. and Roscilde, Tommaso},
abstractNote = {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.},
doi = {10.1038/nature11406},
url = {https://www.osti.gov/biblio/1564845}, journal = {Nature (London)},
issn = {0028-0836},
number = 7416,
volume = 489,
place = {United States},
year = {2012},
month = {9}
}

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