Kenzelmann, M;
Xu, G;
Zaliznyak, IA;
Broholm, C;
DiTusa, JF;
Aeppli, G;
Ito, T;
... Takagi, H; + view all
(2003)
Structure of end states for a haldane spin chain.
PHYS REV LETT
, 90
(8)
, Article 087202. 10.1103/PhysRevLett.90.087202.
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Abstract
Inelastic neutron scattering was used to probe edge states in a quantum spin liquid. The experiment was performed on finite length antiferromagnetic spin-1 chains in Y2BaNi1-xMgxO5. At finite fields, there is a Zeeman resonance below the Haldane gap. The wave-vector dependence of its intensity provides direct evidence for staggered magnetization at chain ends, which decays exponentially towards the bulk [xi=8(1) at T=0.1 K]. Continuum contributions to the chain-end spectrum indicate interchain segment interactions. We also observe a finite size blueshift of the Haldane gap.
| Type: | Article |
|---|---|
| Title: | Structure of end states for a haldane spin chain |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.90.087202 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.90.087202 |
| Language: | English |
| Additional information: | © 2003 The American Physical Society |
| Keywords: | HEISENBERG CHAIN, CHARGE DYNAMICS, IMPURITY ATOMS, Y2BANIO5, SYSTEM, BI2SR2CACU2O8+DELTA, SUPERCONDUCTIVITY, ANTIFERROMAGNETS, EXCITATIONS, DEFECTS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/112735 |
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