2001/12/20 by R. Jin, Jin, R., J. R. Thompson +13
Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Theoretical and Computational Physics
paper · pdf · doi:10.48550/arxiv.cond-mat/0112405
openalex publication_date 2001/12/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Sr2RuO4 is an unconventional superconductor with a tetragonal structure, whereas Ca2RuO4 is a Mott insulator with orthorhombic symmetry. The substituted Ca2-xSrxRuO4 has yielded a rich phase diagram that is just beginning to be explored in detail. Experimental investigation of the resistivity ρ, susceptibility χ, specific heat Cp, Hall coefficient RH, and X-ray diffraction of Ca1.7Sr0.3RuO4 reveals a structural phase transition near T0 = 190 K and heavy-Fermion (HF) behavior below a coherence temperature T^* ∼ 10 K, resembling that of the \itf-electron HF compound UPt3. The observation of T2-dependence of ρ below ∼ 0.5 K suggests a Fermi-liquid ground state. Based upon our data and theoretical calculations, we argue that the structural change at T0 may be responsible for the formation of the HF state.