Abstract
We have investigated the spin dynamics using O17-NMR in the bilayered perovskite Sr3Ru2O7, which sits close to a metamagnetic quantum critical point. The nuclear spin-lattice relaxation rate divided by temperature 1/T1T is enhanced on approaching the metamagnetic critical field of ∼7.9T, and at the critical field 1/T1T continues to increase and does not show Fermi-liquid behavior down to 0.3 K. The temperature dependence of T1T in this region suggests the critical temperature Θ to be ∼0K, which is strong evidence that the spin dynamics possesses a quantum critical character. Comparison between uniform susceptibility and 1/T1T reveals that antiferromagnetic fluctuations instead of two-dimensional ferromagnetic fluctuations dominate the spin fluctuation spectrum at the critical field, which is unexpected for itinerant metamagnetism.
Original language | English |
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Article number | 127001 |
Journal | Physical Review Letters |
Volume | 95 |
Issue number | 12 |
DOIs | |
State | Published - 2005/09/16 |
ASJC Scopus subject areas
- General Physics and Astronomy