10 research outputs found
Effects of hydrostatic pressure on the magnetic susceptibility of ruthenium oxide Sr3Ru2O7: Evidence for pressure-enhanced antiferromagnetic instability
Hydrostatic pressure effects on the temperature- and magnetic field
dependencies of the in-plane and out-of-plane magnetization of the bi-layered
perovskite Sr3Ru2O7 have been studied by SQUID magnetometer measurements under
a hydrostatic helium-gas pressure. The anomalously enhanced low-temperature
value of the paramagnetic susceptibility has been found to systematically
decrease with increasing pressure. The effect is accompanied by an increase of
the temperature Tmax of a pronounced peak of susceptibility. Thus,
magnetization measurements under hydrostatic pressure reveal that the lattice
contraction in the structure of Sr3Ru2O7 promotes antiferromagnetism and not
ferromagnetism, contrary to the previous beliefs. The effects can be explained
by the enhancement of the inter-bi-layer antiferromagnetic spin coupling,
driven by the shortening of the superexchange path, and suppression, due to the
band-broadening effect, of competing itinerant ferromagnetic correlations.Comment: 11 pages, 4 figure