Unexpected Phase Locking of Magnetic Fluctuations in the Multi-k Magnet USb
The spin waves in the multi-k antiferromagnet, USb, soften and become quasielastic well below the AFM ordering temperature TN. This occurs without a magnetic or structural transition. It has been suggested that this change is in fact due to de-phasing of the different multi-k components: a switch from 3-k to 1-k behavior. In this work, we use inelastic neutron scattering with tridirectional polarisation analysis to probe the quasielastic magnetic excitations and reveal that the 3-k structure does not de-phase. More surprisingly, the paramagnetic correlations also maintain the same clear phase correlations well above TN (up to at least 1:4 TN).
LIM J. A.;
BLACKBURN E.;
MAGNANI Nicola;
HIESS A.;
REGNAULT L.P.;
CACIUFFO Roberto;
LANDER G.H.;
2013-04-17
AMER PHYSICAL SOC
JRC79523
1098-0121,
http://prb.aps.org/abstract/PRB/v87/i6/e064421,
https://publications.jrc.ec.europa.eu/repository/handle/JRC79523,
10.1103/PhysRevB.87.064421,
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