Novel Character of Spin Fluctuations in Spin-Triplet Superconductor Sr_2RuO_4 : ^<17>O-NMR Study

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XVe report "0-NIVIR sttmdies in the nortaaal state of high-qu;tlity single-crystal Sr,zRuO,j withT. xi,5 K, which has been identified as spin-triplet p-wave strpercorxdtrctor. Frouta systeunaticmeastnrements of the Knight shift and the ntuclear spin-lattice relaxation tiune T? on the Owl)sites in the R1102 planes and the 0(2) sites in the SrO layers, microscopic distribution of thespin density on the p orbitals and the anisotropy of low-f'reqtrency conaponents of dynamicalsusceptibility g(q,w..) have been trnraveled 2lS f'ollows; (l) The spin sttsceptibility at the Owl)sites is much larger than that at the 0(2) sites. (2) Frorn the anisotropy in the Knight shift atthe O(1) sites, it is shown Chart the spin density resides predonninantly on the in-plane p. orlcitalshvbridized with the 4d.v orbitals. (3) Frorn the rcronounced anisotrorv in (l/'Z'1'Z") at both sitesdeveloped below 'Z"xl3O K where the c-axis resistivity shows a rnetallic behavior, we have fotmndthat the low-freqtuency conuponents of 'g(q,w.) is highly anisotropic in contrast to the tnniforrnsr>in strscer>tibilitv bein: isotroric. The in-rlane comronerrl;s of X((7,(J.) at the Owl) sites arealmost independent of wave number althotrgh they are exchange-enhanced, whereas its otrt-of'-plane component is nuarkedly enhanced by interlayer antiferrornagnetic (AF) spin .f7,uctuationsbelow T" x 130 K. (4) For the apical O(2) sites on which the p orbitals are hybridized with the4d..,.. and p. orbitals on the Owl) site, the in-plane counponents of 7g(q,w.) are enhanced byAF-spin fluctuations as well. The AF-spin fltrctttations develop as qtrasiparticles ho)c coherentlyalong the c-axis below T'. These characteristics of spin fluctuations are suggested to providea new scenario bttsed on the Hund's cotrpling as a possible mechanistn of spin-triplet p-wavesuperconductivity in Sr3RuOj, not on analogy with 'He,
社団法人日本物理学会の論文
1998-11-15

Novel Character of Spin Fluctuations in Spin-Triplet Superconductor Sr_2RuO_4 : ^<17>O-NMR Study

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