Evolution of normal-state magnetic fluctuations by Ca and Ti substitutions in Sr2RuO4:: 87Sr-NMR study -: art. no. 214412

被引：17

作者：

Ishida, K ^{[1
]}

Minami, Y

Kitaoka, Y

Nakatsuji, S

Kikugawa, N

Maeno, Y

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[2] Osaka Univ, Grad Sch Engn Sci, Dept Phys Sci, Toyonaka, Osaka 5608531, Japan

[3] Kyoto Univ, Int Innovat Ctr, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.67.214412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report magnetic properties of (Sr2-xCax)RuO4 and Sr-2(Ru1-yTiy)O-4 investigated by Sr-87 nuclear magnetic resonance NMR to shed light on the effect of multibands on the magnetic character in the spin-triplet superconductor Sr2RuO4. In (Sr2-xCax)RuO4, the Knight shift (K-87) at 1.4 K increases progressively up to x=1.5. The Korringa relation between K and the nuclear-spin-lattice-relaxation rate 1/T-1 divided by temperature (1/T1T) reveals that ferromagnetic (FM) fluctuations develop with the increasing Ca content. In Sr-2(Ru1-yTiy)O-4, in contrast, it is found that anisotropic incommensurate (IC) antiferromagnetic (AFM) fluctuations present in the y=0 material are enhanced by a small amount of Ti substitution: 1/T1T is enhanced with the magnetic field parallel to the RuO2 plane, whereas it is unchanged for the field along the c axis in 3% Ti-doped Sr2RuO4. We demonstrate that Ca substitution affects the two-dimensional (2D) gamma band by enhancing the FM fluctuations, and that the Ti-substitution affects the 1D alpha and beta bands by enhancing the IC-AFM fluctuations. The unique substitution effects would relate with the multiband character in Sr2RuO4.

引用

页数：6

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