title: Evidence of two distinct dynamical freezing processes in single-layered perovskite La(0.7)Sr(1.3)CoO4.
abstract: The static and dynamic features of magnetization have been investigated in terms of dc magnetization, ac susceptibility, and memory effects on single-layered perovskite La(0.7)Sr(1.3)CoO(4). The results indicate that short-range ferromagnetic clusters coexist with the glassy magnetic state, i.e., a cluster-glass phase between T(f) and T(G) and a spin-glass-like phase below T(f). The clear evidence of memory effects in the dc magnetization is also observed below T(f) and T(G), respectively. These two glassy states with cooperative relaxation processes may derive from the different interaction processes among nanoscale ferromagnetic clusters mediated by the matrix, which is influenced by changing the spin state of Co(3+) ions in spontaneously phase-separated cobaltite.
authors.affiliation: Center for Condensed Matter Science and Technology (CCMST), Department of Physics, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
authors.forename: Jinhua
authors.initials: J
authors.lastname: Mao
authors.forename: Yu
authors.initials: Y
authors.lastname: Sui
authors.forename: Xingquan
authors.initials: X
authors.lastname: Zhang
authors.forename: Xianjie
authors.initials: X
authors.lastname: Wang
authors.forename: Yantao
authors.initials: Y
authors.lastname: Su
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Liu
authors.forename: Ruibin
authors.initials: R
authors.lastname: Zhu
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Liu
authors.forename: Wanfa
authors.initials: W
authors.lastname: Liu
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry*; D005615:Freezing; D007811:Lanthanum / Q000737:chemistry*; D008280:Magnetics; D008958:Models, Molecular; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; C059910:perovskite; D003035:Cobalt; C103829:lanthanum oxide; D007811:Lanthanum; D014025:Titanium; C060728:cobalt oxide; D013324:Strontium