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Title: In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}

Abstract

High resolution neutron scattering measurements on a single crystal of SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2} with x{approx}0.05 reveal the presence of new spin excitations within the gap of this quasi-two-dimensional, singlet ground state system. The application of a magnetic field induces Zeeman-split states associated with S=1/2 unpaired spins which are antiferromagnetically correlated with the bulk singlet. Substantial broadening of both the one- and two-triplet excitations in the doped single crystal is observed, as compared with pure SrCu{sub 2}(BO{sub 3}){sub 2}. Theoretical calculations using a variational algorithm and a single quenched magnetic vacancy on an infinite lattice are shown to qualitatively account for these effects.

Authors:
; ;  [1];  [2];  [1];  [3]; ;  [4];  [2];  [5]
  1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
  2. J. Stefan Institute, SI-1000 Ljubljana (Slovenia)
  3. (Canada)
  4. Rutherford Appleton Laboratory, ISIS Pulsed Neutron Facility, Chilton, Didcot, Oxon OX110QX (United Kingdom)
  5. (Slovenia)
Publication Date:
OSTI Identifier:
20861488
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 97; Journal Issue: 24; Other Information: DOI: 10.1103/PhysRevLett.97.247206; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALGORITHMS; BORATES; COPPER COMPOUNDS; DOPED MATERIALS; EXCITATION; GROUND STATES; LIFETIME; MAGNESIUM COMPOUNDS; MAGNETIC FIELDS; MONOCRYSTALS; NEUTRON DIFFRACTION; SPIN; STRONTIUM COMPOUNDS; TRIPLETS; TWO-DIMENSIONAL CALCULATIONS; VACANCIES; VARIATIONAL METHODS; ZEEMAN EFFECT

Citation Formats

Haravifard, S., Dunsiger, S. R., Dabkowska, H. A., El Shawish, S., Gaulin, B. D., Canadian Institute for Advanced Research, 180 Dundas Street W, Toronto, Ontario M5G 1Z8, Telling, M. T. F., Perring, T. G., Bonca, J., and Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana. In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVLETT.97.247206.
Haravifard, S., Dunsiger, S. R., Dabkowska, H. A., El Shawish, S., Gaulin, B. D., Canadian Institute for Advanced Research, 180 Dundas Street W, Toronto, Ontario M5G 1Z8, Telling, M. T. F., Perring, T. G., Bonca, J., & Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana. In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}. United States. doi:10.1103/PHYSREVLETT.97.247206.
Haravifard, S., Dunsiger, S. R., Dabkowska, H. A., El Shawish, S., Gaulin, B. D., Canadian Institute for Advanced Research, 180 Dundas Street W, Toronto, Ontario M5G 1Z8, Telling, M. T. F., Perring, T. G., Bonca, J., and Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana. Fri . "In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}". United States. doi:10.1103/PHYSREVLETT.97.247206.
@article{osti_20861488,
title = {In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2}},
author = {Haravifard, S. and Dunsiger, S. R. and Dabkowska, H. A. and El Shawish, S. and Gaulin, B. D. and Canadian Institute for Advanced Research, 180 Dundas Street W, Toronto, Ontario M5G 1Z8 and Telling, M. T. F. and Perring, T. G. and Bonca, J. and Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana},
abstractNote = {High resolution neutron scattering measurements on a single crystal of SrCu{sub 2-x}Mg{sub x}(BO{sub 3}){sub 2} with x{approx}0.05 reveal the presence of new spin excitations within the gap of this quasi-two-dimensional, singlet ground state system. The application of a magnetic field induces Zeeman-split states associated with S=1/2 unpaired spins which are antiferromagnetically correlated with the bulk singlet. Substantial broadening of both the one- and two-triplet excitations in the doped single crystal is observed, as compared with pure SrCu{sub 2}(BO{sub 3}){sub 2}. Theoretical calculations using a variational algorithm and a single quenched magnetic vacancy on an infinite lattice are shown to qualitatively account for these effects.},
doi = {10.1103/PHYSREVLETT.97.247206},
journal = {Physical Review Letters},
number = 24,
volume = 97,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}