Normal-state spin dynamics in the spin-triplet superconductor Sr2RuO4

K. Ishida; H. Mukuda; Y. Minami; Y. Kitaoka; Z. Q. Mao; H. Fukazawa; Y. Maeno

doi:10.1103/PhysRevB.64.100501

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Normal-state spin dynamics in the spin-triplet superconductor Sr2RuO4

K. Ishida, H. Mukuda, Y. Minami, Y. Kitaoka, Z. Q. Mao, H. Fukazawa, Y. Maeno

DOI 10.1103/PhysRevB.64.100501 · Physical Review B

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Abstract

Magnetic properties in the normal state of spin-triplet superconductor Sr2RuO4 are discussed on the basis of Ru- and O-NMR and neutron-diffraction (ND) measurements reported so far. Besides strong incommensurate antiferromagnetic (IC-AFM) fluctuations probed by the ND measurements, it is shown that q-independent fluctuations are present over a wide temperature range up to 500 K from the comparison between NMR and ND results. From an anisotropy in the nuclear spin lattice relaxation rate 1/T1 at both the Ru and O sites, it was found that the IC-AFM fluctuations are anisotropic so that the out-of-plane component of low-frequency dynamical susceptibility, χIC,out″(q,ω) is by a factor of ∼3 larger than the in-plane one, χIC,in″(q,ω). These unique characters in magnetic fluctuations are implied to have some relevance for the occurrence of spin-triplet superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown