Metamagnetic quantum criticality revealed by O17-NMR in the itinerant metamagnet Sr3Ru2O7

K. Kitagawa*, K. Ishida, R. S. Perry, T. Tayama, T. Sakakibara, Y. Maeno

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

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 languageEnglish
Article number127001
JournalPhysical Review Letters
Volume95
Issue number12
DOIs
StatePublished - 2005/09/16

ASJC Scopus subject areas

  • General Physics and Astronomy

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