Manganese-induced magnetic symmetry breaking and its correlation with the metal-insulator transition in bilayered Sr-3(Ru1-xMnx)(2)O-7

Article

关键词: QUANTUM CRITICALITY;    NEUTRON-DIFFRACTION;    RUTHENATE SR3RU2O7;    SINGLE-CRYSTALS;    PHASE-FORMATION;    STATE;    ORDER;   

DOI  :  10.1103/PhysRevB.95.220403

来源: SCIE

【 摘 要 】

Bilayered Sr3Ru2O7 is an unusual metamagnetic metal with inherently antiferromagnetic (AFM) and ferromagnetic (FM) fluctuations. Partial substitution of Ru by Mn results in the establishment of a metal-insulator transition (MIT) at T-MIT and AFM ordering at T-M in Sr-3(Ru1-xMn (x))(2)O-7. Using elastic neutron scattering, we investigated the effect of Mn doping on the magnetic structure, in-plane magnetic correlation lengths and their correlation to the MIT in Sr-3(Ru1-xMn (x))(2)O-7 (x = 0.06 and 0.12). With the increase of Mn doping (x) from 0.06 to 0.12 or the decrease of temperatures for x = 0.12, an evolution from an in-plane short-range to long-range antiferromagnetic (AFM) ground state occurs. For both compounds, the magnetic ordering has a double-stripe configuration, and the onset of magnetic correlation with an anisotropic behavior coincides with the sharp rise in electrical resistivity and specific heat. Since it does not induce a measurable lattice distortion, the double-stripe antiferromagnetic order with anisotropic spin texture breaks symmetry from a C-4v crystal lattice to a C-2v magnetic sublattice. These observations shed light on an age-old question regarding the Slater versus Mott-type MIT.

【 授权许可】

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