Ding, L;
Manuel, P;
Bachus, S;
Grussler, F;
Gegenwart, P;
Singleton, J;
Johnson, RD;
... Tsirlin, AA; + view all
(2019)
Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO2.
Physical Review B
, 100
(14)
, Article 144432. 10.1103/PhysRevB.100.144432.
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Abstract
We present a candidate material, NaYbO2, that realizes the genuine spin-liquid state on the triangular lattice and benchmarks recent theoretical predictions on the relevant spin models. Synchrotron x-ray diffraction and neutron scattering exclude both structural disorder and crystal-electric-field randomness. Our thermodynamic measurements, neutron diffraction, and muon spectroscopy coincidentally prove the absence of magnetic order and persistent spin dynamics down to at least 70 mK. Continuous magnetic excitations first observed by inelastic neutron scattering show a gapless feature and the low-energy spectral weight accumulating at the K point of the Brillouin zone, in agreement with theoretical predictions for the spin-liquid phase of triangular antiferromagnets. Such a gapless spin-liquid phase is further confirmed by our magnetic specific heat analysis that reveals a departure from simple power-law behavior. Our work demonstrates that NaYbO2 practically gives direct experimental access to the spin-liquid physics of triangular antiferromagnets.
| Type: | Article |
|---|---|
| Title: | Gapless spin-liquid state in the structurally disorder-free triangular antiferromagnet NaYbO2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.100.144432 |
| Publisher version: | https://doi.org/10.1103/PhysRevB.100.144432 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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 UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10086437 |
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