Published December 15, 2006 | Version v1
Journal article Metadata-only

In-Gap Spin Excitations and Finite Triplet Lifetimes in the Dilute Singlet Ground State System SrCu2-xMgx(BO3)2

Creators

  • 1. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
  • 2. J. Stefan Institute, SI-1000 Ljubljana (Slovenia)
  • 3. Canadian Institute for Advanced Research, 180 Dundas Street W, Toronto, Ontario M5G 1Z8 (Canada)
  • 4. Rutherford Appleton Laboratory, ISIS Pulsed Neutron Facility, Chilton, Didcot, Oxon OX110QX (United Kingdom)
  • 5. Faculty of Mathematics and Physics, University of Ljubljana, SI-1000 Ljubljana (Slovenia)

Description

High resolution neutron scattering measurements on a single crystal of SrCu2-xMgx(BO3)2 with x∼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 SrCu2(BO3)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

Additional details

Identifiers

DOI
10.1103/PhysRevLett.97.247206;
arXiv
arXiv:cond-mat/0608442v1;

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
97
Journal Issue
24
Journal Page Range
p. 247206-247206.4
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
38024450
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
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
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ANGULAR MOMENTUM; BORON COMPOUNDS; CALCULATION METHODS; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; ENERGY LEVELS; ENERGY-LEVEL TRANSITIONS; MATERIALS; MATHEMATICAL LOGIC; MULTIPLETS; OXYGEN COMPOUNDS; PARTICLE PROPERTIES; POINT DEFECTS; SCATTERING; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
(c) 2006 The American Physical Society