Quantum phase transition in the itinerant antiferromagnet (V0.9Ti0.1)2O3...

Quantum critical behavior of the itinerant electron antiferromagnet (V0.9Ti0.1)2O3 has been studied
by single-crystalline neutron scattering. By directly observing antiferromagnetic spin fluctuations
in the paramagnetic phase, we have shown that the characteristic energy depends on temperature
as c1 +c2T3/2, where c1 and c2 are constants. This T3/2 dependence demonstrates that the present
strongly correlated d-electron antiferromagnet clearly shows the criticality of the spin-density-wave
quantum phase transition in three space dimensions.
PACS numbers: 71.27.+a,71.10.Hf,75.40.-s,75.40.Gb