title: Non-Fermi-liquid spin dynamics in CeCoGe3-xSi(x) for x = 1.2 and 1.5.
abstract: Muon spin relaxation has been measured in CeCoGe3-xSi(x) at the magnetic/nonmagnetic boundary compositions of x = 1.2 and x = 1.5. Both the alloys are found to exhibit an ordered region and a disordered region. At x = 1.2, short-range magnetic ordering is observed below 0.86 K in the ordered region. The disordered region is paramagnetic and the muon spin-lattice relaxation rate lambda2 in this region displays non-Fermi-liquid (NFL) spin dynamics, i.e., the power law lambda2 proportional to T0.72 which shows the formation of Griffiths phase. lambda2 in the x = 1.5 alloy displays logarithmic (NFL) scaling below 1 K, in agreement with the theory of a T = 0 K magnetic transition.
authors.affiliation: The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan.
authors.forename: V V
authors.initials: VV
authors.lastname: Krishnamurthy
authors.forename: K
authors.initials: K
authors.lastname: Nagamine
authors.forename: I
authors.initials: I
authors.lastname: Watanabe
authors.forename: K
authors.initials: K
authors.lastname: Nishiyama
authors.forename: S
authors.initials: S
authors.lastname: Ohira
authors.forename: M
authors.initials: M
authors.lastname: Ishikawa
authors.forename: D H
authors.initials: DH
authors.lastname: Eom
authors.forename: T
authors.initials: T
authors.lastname: Ishikawa
authors.forename: T M
authors.initials: TM
authors.lastname: Briere