Quantum critical scaling at a Boseglass/superfluid transition: Theory and experiment for a model quantum magnet
Abstract
Here, we investigate the quantum phase transition from magnetic Bose Glass to magnetic BoseEinstein condensation induced by a magnetic field in NiCl_{2}∙4SC(NH_{2})_{2} (dichlorotetrakisthioureanickel, or DTN), doped with Br (BrDTN) or site diluted. Quantum Monte Carlo simulations for the quantum phase transition of the model Hamiltonian for BrDTN, as well as for sitediluted DTN, are consistent with conventional scaling at the quantum critical point and with a critical exponent $z$ verifying the prediction $z = d$; moreover the correlation length exponent is found to be $ν = 0.75(10)$, and the order parameter exponent to be $β = 0.95(10)$. We investigate the lowtemperature thermodynamics at the quantum critical field of BrDTN both numerically and experimentally, and extract the powerlaw behavior of the magnetization and of the specific heat. Our results for the exponents of the power laws, as well as previous results for the scaling of the critical temperature to magnetic ordering with the applied field, are incompatible with the conventional crossoverscaling Ansatz proposed by Fisher et al. [Phys. Rev. B 40, 546 (1989)]. However they can all be reconciled within a phenomenological Ansatz in the presence of a dangerously irrelevant operator.
 Authors:

 Rice Univ., Houston, TX (United States). Dept. of Physics & Astronomy
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States); National Inst. for Materials Physics, BucharestMagurele (Romania)
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Univ. of Sao Paulo (Brazil). Inst. of Physics
 Univ. de Lyon, Lyon (France). Ecole Normale Supérieure de Lyon, Lab. de Physique
 Publication Date:
 Research Org.:
 Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
 Sponsoring Org.:
 USDOE Office of Science (SC)
 OSTI Identifier:
 1565036
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review. B, Condensed Matter and Materials Physics
 Additional Journal Information:
 Journal Volume: 86; Journal Issue: 13; Journal ID: ISSN 10980121
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; materials science; physics
Citation Formats
Yu, Rong, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, PaduanFilho, Armando, Zapf, Vivien S., and Roscilde, Tommaso. Quantum critical scaling at a Boseglass/superfluid transition: Theory and experiment for a model quantum magnet. United States: N. p., 2012.
Web. doi:10.1103/physrevb.86.134421.
Yu, Rong, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, PaduanFilho, Armando, Zapf, Vivien S., & Roscilde, Tommaso. Quantum critical scaling at a Boseglass/superfluid transition: Theory and experiment for a model quantum magnet. United States. doi:10.1103/physrevb.86.134421.
Yu, Rong, Miclea, Corneliu F., Weickert, Franziska, Movshovich, Roman, PaduanFilho, Armando, Zapf, Vivien S., and Roscilde, Tommaso. Tue .
"Quantum critical scaling at a Boseglass/superfluid transition: Theory and experiment for a model quantum magnet". United States. doi:10.1103/physrevb.86.134421. https://www.osti.gov/servlets/purl/1565036.
@article{osti_1565036,
title = {Quantum critical scaling at a Boseglass/superfluid transition: Theory and experiment for a model quantum magnet},
author = {Yu, Rong and Miclea, Corneliu F. and Weickert, Franziska and Movshovich, Roman and PaduanFilho, Armando and Zapf, Vivien S. and Roscilde, Tommaso},
abstractNote = {Here, we investigate the quantum phase transition from magnetic Bose Glass to magnetic BoseEinstein condensation induced by a magnetic field in NiCl2∙4SC(NH2)2 (dichlorotetrakisthioureanickel, or DTN), doped with Br (BrDTN) or site diluted. Quantum Monte Carlo simulations for the quantum phase transition of the model Hamiltonian for BrDTN, as well as for sitediluted DTN, are consistent with conventional scaling at the quantum critical point and with a critical exponent $z$ verifying the prediction $z = d$; moreover the correlation length exponent is found to be $ν = 0.75(10)$, and the order parameter exponent to be $β = 0.95(10)$. We investigate the lowtemperature thermodynamics at the quantum critical field of BrDTN both numerically and experimentally, and extract the powerlaw behavior of the magnetization and of the specific heat. Our results for the exponents of the power laws, as well as previous results for the scaling of the critical temperature to magnetic ordering with the applied field, are incompatible with the conventional crossoverscaling Ansatz proposed by Fisher et al. [Phys. Rev. B 40, 546 (1989)]. However they can all be reconciled within a phenomenological Ansatz in the presence of a dangerously irrelevant operator.},
doi = {10.1103/physrevb.86.134421},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 13,
volume = 86,
place = {United States},
year = {2012},
month = {10}
}
Web of Science
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