Magneto-elastic coupling in hexagonal YMnO_3
| dc.creator | Poirier, Mario | |
| dc.creator | Laliberte, Francis | |
| dc.creator | Pinsard, Loreynne | |
| dc.creator | Revcolevschi, Alexandre | |
| dc.date | 2007-08-06 | |
| dc.date.accessioned | 2026-07-07T08:22:20Z | |
| dc.date.available | 2026-07-07T08:22:20Z | |
| dc.description | We report an ultrasonic investigation of the elastic moduli on a single crystal of hexagonal YMnO_3 as a function of temperature. Stiffening anomalies in the antiferromagnetic Néel state below T_N = 72.4 K are observed on all the four elastic moduli C_{ii}. The anomalies are the most important on C_{11} and C_{66} for in-plane elastic deformations; this is consistent with a strong coupling of the lattice with the in-plane exchange interactions. We use a Landau free energy model to account for these elastic anomalies. We derive an expression which relates the temperature profile of the anomaly to the order parameter; the critical exponent associated to this parameter $β$ = 0.42 is not consistent with a chiral XY or 3D Heisenberg universality class, but more in agreement with a conventional antiferromagnetic long range order. A tiny softening anomaly on C_{11} for which hysteresis effects are observed could be indicative of an interaction between ferroelectric and magnetic domains at T_N. Moreover, magnetic fluctuations effects both above and below T_N are identified through abnormal temperature and magnetic field effects. | |
| dc.identifier | https://arxiv.org/abs/0708.0754 | |
| dc.identifier | http://arxiv.org/abs/0708.0754 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/135619 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Magneto-elastic coupling in hexagonal YMnO_3 | |
| dc.type | text |