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Magnetic instability in Ca2−xSrxRuO4 with x = 0.5
Naoya Arakawa,Masao Ogata 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We analyze the static susceptibilities for charge and spin degrees of freedom in Ca2−xSrxRuO4with x = 0.5 within the random phase approximation on the basis of the three-orbital Hubbardmodel for the Ru t2g orbitals. We find that the rotation of RuO6 octahedra, which is induced inthe range of x < 1.5, leads to the enhancement of several modes of spin fluctuation around bothq = (0, 0) and (, 0).