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Title: Magnetic nanopantograph in the SrCu 2(BO 3) 2 Shastry–Sutherland lattice

Abstract

Magnetic materials having competing, i.e., frustrated, interactions can display magnetism prolific in intricate structures, discrete jumps, plateaus, and exotic spin states with increasing applied magnetic fields. When the associated elastic energy cost is not too expensive, this high potential can be enhanced by the existence of an omnipresent magnetoelastic coupling. Here in this work, we report experimental and theoretical evidence of a nonnegligible magnetoelastic coupling in one of these fascinating materials, SrCu 2(BO 3) 2 (SCBO). First, using pulsed-field transversal and longitudinal magnetostriction measurements we show that its physical dimensions, indeed, mimic closely its unusually rich field-induced magnetism. Second, using density functional-based calculations we find that the driving force behind the magnetoelastic coupling is the CuOCuˆ superexchange angle that, due to the orthogonal Cu 2+ dimers acting as pantographs, can shrink significantly (0.44%) with minute (0.01%) variations in the lattice parameters. Lastly, with this original approach we also find a reduction of ~10% in the intradimer exchange integral J, enough to make predictions for the highly magnetized states and the effects of applied pressure on SCBO.

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5]
  1. Univ. Pierre et Marie Curie, Paris (France)
  2. Aix-Marseille University (France); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. McMaster Univ., Hamilton, ON (Canada)
  4. Univ. of Texas-Dallas, Richardson, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1471322
Report Number(s):
LA-UR-14-28761
Journal ID: ISSN 0027-8424
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 7; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; magnetostriction; high magnetic fields; spin-lattice coupling; density functional theory; Shastry–Sutherland

Citation Formats

Radtke, Guillaume, Saúl, Andrés, Dabkowska, Hanna A., Salamon, Myron B., and Jaime, Marcelo. Magnetic nanopantograph in the SrCu2(BO3)2 Shastry–Sutherland lattice. United States: N. p., 2015. Web. doi:10.1073/pnas.1421414112.
Radtke, Guillaume, Saúl, Andrés, Dabkowska, Hanna A., Salamon, Myron B., & Jaime, Marcelo. Magnetic nanopantograph in the SrCu2(BO3)2 Shastry–Sutherland lattice. United States. doi:10.1073/pnas.1421414112.
Radtke, Guillaume, Saúl, Andrés, Dabkowska, Hanna A., Salamon, Myron B., and Jaime, Marcelo. Mon . "Magnetic nanopantograph in the SrCu2(BO3)2 Shastry–Sutherland lattice". United States. doi:10.1073/pnas.1421414112. https://www.osti.gov/servlets/purl/1471322.
@article{osti_1471322,
title = {Magnetic nanopantograph in the SrCu2(BO3)2 Shastry–Sutherland lattice},
author = {Radtke, Guillaume and Saúl, Andrés and Dabkowska, Hanna A. and Salamon, Myron B. and Jaime, Marcelo},
abstractNote = {Magnetic materials having competing, i.e., frustrated, interactions can display magnetism prolific in intricate structures, discrete jumps, plateaus, and exotic spin states with increasing applied magnetic fields. When the associated elastic energy cost is not too expensive, this high potential can be enhanced by the existence of an omnipresent magnetoelastic coupling. Here in this work, we report experimental and theoretical evidence of a nonnegligible magnetoelastic coupling in one of these fascinating materials, SrCu2(BO3)2 (SCBO). First, using pulsed-field transversal and longitudinal magnetostriction measurements we show that its physical dimensions, indeed, mimic closely its unusually rich field-induced magnetism. Second, using density functional-based calculations we find that the driving force behind the magnetoelastic coupling is the CuOCuˆ superexchange angle that, due to the orthogonal Cu2+ dimers acting as pantographs, can shrink significantly (0.44%) with minute (0.01%) variations in the lattice parameters. Lastly, with this original approach we also find a reduction of ~10% in the intradimer exchange integral J, enough to make predictions for the highly magnetized states and the effects of applied pressure on SCBO.},
doi = {10.1073/pnas.1421414112},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 7,
volume = 112,
place = {United States},
year = {2015},
month = {2}
}

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