Competing Bose-glass physics with disorder-induced Bose-Einstein condensation in the doped S=1 antiferromagnet Ni(Cl1xBrx)24SC(NH2)2 at high magnetic fields

Maxime Dupont, Sylvain Capponi, Mladen Horvatić, and Nicolas Laflorencie
Phys. Rev. B 96, 024442 – Published 26 July 2017

Abstract

We study the interplay between disorder and interactions for emergent bosonic degrees of freedom induced by an external magnetic field in the Br-doped spin-gapped antiferromagnetic material Ni(Cl1xBrx)24SC(NH2)2 (DTNX). Building on nuclear magnetic resonance experiments at high magnetic field [A. Orlova et al., Phys. Rev. Lett. 118, 067203 (2017)], we describe the localization of isolated impurity states, providing a realistic theoretical modeling for DTNX. Going beyond single impurity localization we use quantum Monte Carlo simulations to explore many-body effects from which pairwise effective interactions lead to a (impurity-induced) Bose-Einstein condensation (BEC) revival [M. Dupont, S. Capponi, and N. Laflorencie, Phys. Rev. Lett. 118, 067204 (2017)]. We further address the question of the existence of a many-body localized Bose-glass (BG) phase in DTNX, which is found to compete with a series of a new kind of BEC regimes made out of the multi-impurity states. The global magnetic field–temperature phase diagram of DTNX reveals a very rich structure for low impurity concentration, with consecutive disorder-induced BEC minidomes separated by intervening many-body localized BG regimes. Upon increasing the impurity level, multiple mini-BEC phases start to overlap, while intermediate BG regions vanish.

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  • Received 31 May 2017

DOI:https://doi.org/10.1103/PhysRevB.96.024442

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Maxime Dupont1,2,*, Sylvain Capponi1,2,†, Mladen Horvatić3,‡, and Nicolas Laflorencie1,§

  • 1Laboratoire de Physique Théorique, IRSAMC, Université de Toulouse, CNRS, UPS, France
  • 2Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
  • 3Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), EMFL, UGA, UPS, and INSA, Boîte Postale 166, 38042, Grenoble Cedex 9, France

  • *maxime.dupont@irsamc.ups-tlse.fr
  • sylvain.capponi@irsamc.ups-tlse.fr
  • mladen.horvatic@lncmi.cnrs.fr
  • §nicolas.laflorencie@irsamc.ups-tlse.fr

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Issue

Vol. 96, Iss. 2 — 1 July 2017

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