Transport, magnetic, thermodynamic and optical properties in Ti-doped Sr_2RuO_4

Abstract

We report on electrical resistivity, magnetic susceptibility and magnetization, on heat capacity and optical experiments in single crystals of Sr_2Ru_(1-x)Ti_xO_4. Samples with x=0.1 and 0.2 reveal purely semiconducting resistivity behavior along c and the charge transport is close to localization within the ab-plane. A strong anisotropy in the magnetic susceptibility appears at temperatures below 100 K. Moreover magnetic ordering in c-direction with a moment of order 0.01 mu_B/f.u. occurs at low temperatures. On doping the low-temperature linear term of the heat capacity becomes reduced significantly and probably is dominated by spin fluctuations. Finally, the optical conductivity reveals the anisotropic character of the dc resistance, with the in-plane conductance roughly following a Drude-type behavior and an insulating response along c.

References in corpus (8)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Evidence for incommensurate spin fluctuations in Sr_2RuO_4
• The ground state of Sr3Ru2O7 revisited; Fermi liquid close to a ferromagnetic instability
• Competitions in layered ruthenates: ferro- vs. antiferromagnetism and triplet vs. singlet pairing
• Spin-triplet superconductivity due to antiferromagnetic spin-fluctuation in Sr_2RuO_4
• Phenomenology of the superconducting state in Sr2RuO4
• Magnetic ordering in Sr2RuO4 induced by nonmagnetic impurities
• A reconstruction from small-angle neutron scattering measurements of the real space magnetic field distribution in the mixed state of Sr${}_2$RuO${}_4$

Cited by in corpus (6)

• Rigid-Band Shift of the Fermi Level in a Strongly Correlated Metal: Sr(2-y)La(y)RuO(4)
• Robust paramagnetism in Bi2-xMxRu2O7 (M=Mn,Fe,Co,Ni,Cu) pyrochlore
• Electron-spectroscopic investigation of metal-insulator transition in Sr2Ru1-xTixO4 (x=0.0-0.6)
• Competing magnetic fluctuations in Sr3Ru2O7 probed by Ti doping
• Two-dimensional incommensurate magnetic fluctuations in Sr${}_2$(Ru${}_{0.99}$Ti${}_{0.01}$)O${}_4$
• Non-Fermi surface nesting driven commensurate magnetic ordering in Fe-doped Sr${}_2$RuO${}_4$