Formation of magnetic glass in calcium doped YBaCo2O5.5 cobaltites

Abstract

The d.c. magnetization and magnetic relaxation studies of the calcium doped samples, Y0.95Ca0.05BaCo2O5.5 and YBa0.95Ca0.05Co2O5.5, show the existence of a magnetic glass like behaviour in the family of cobaltites for the first time. Our investigations reveal glass-like arrest of kinetics at low temperature which prevents the system from reaching its magnetic ground state. We show that the low temperature state of these calcium doped phases, which consists of coexisting antiferromagnetic and ferro (or ferri) magnetic phase fractions, can be tuned in a number of ways. Our observations establish that the low temperature state of this oxide is not in thermal equilibrium. The glassy state is formed with the assistance of an external magnetic field, which makes it distinctly different from the more well known metastable state, the spin glass state. The cooling field can tune the fractions of the coexisting phases, and the glass-like state formed at low temperature can also be devitrified by warming the sample. The role of Ca doping in the appearance of these phenomena is discussed in terms of phase separation, involving Co3+ disproportionation into Co4+ ferromagnetic clusters and Co2+ antiferromagnetic clusters.

17 pages, 5 figures. Erratum DOI: 10.1103/PhysRevB.84.059904: "The authors did not cite a relevant and important reference. The cooling and heating in unequal field (CHUF) protocol that has been used and described in Sec. III B 2 of this paper was first published in Ref. 1 [arXiv:0805.1514]. We apologize for this omission."

References in corpus (8)

• Transport and magnetic properties of GdBaCo_{2}O_{5+x} single crystals: A cobalt oxide with square-lattice CoO_2 planes over a wide range of electron and hole doping
• Kinetic arrest of the first order ferromagnetic to antiferromagnetic transition in Ce(Fe${}_{0.96}$Ru${}_{0.04}$)${}_2$ : formation of a magnetic-glass
• Spin structure and magnetic phase transitions in TbBaCo2O5.5
• Contrasting the magnetic response between magnetic-glass and reentrant spin-glass
• Electron transport and thermoelectric properties of layered perovskite LaBaCo2O5.5
• Probing phase coexistence and stabilization of the spin-ordered ferrimagnetic state by Calcium addition in the YBa_{1-x}Ca_{x}Co_{2}O_{5.5} layered cobaltites using neutron diffraction
• Synchronization of multi-phase oscillators: An Axelrod-inspired model
• Transport and magnetic properties in YBaCo2O5.45: Focus on the high-temperature transition

Cited by in corpus (7)

• History dependent nucleation and growth of the martensitic phase in a magnetic shape memory alloy Ni${}_{45}$Co${}_5$Mn${}_{38}$Sn${}_{12}$
• Kinetic arrest related to a first-order ferrimagnetic to antiferromagnetic transition in the Heusler compound Mn2PtGa
• Evolution of complex magnetic phases and metal-insulator transition through Nb substitution in La${}_{0.5}$Sr${}_{0.5}$Co${}_{1-x}$Nb${}_x$O${}_3$
• Low temperature high magnetic field ${}^{57}Fe$ M$\ddot{o}$ssbauer study of kinetic arrest in $H{f}_{0.77}T{a}_{0.23}F{e}_2$
• Tailoring the ground state of the ferrimagnet La2Ni(Ni1/3Sb2/3)O6
• Electron doping induced magnetic glassy state in phase separated YBaCo${}_2$O${}_{5.5-\delta }$
• Magnetic glassy state at low spin state of Co3+ in EuBaCo2O5+δ (δ = 0.47) cobaltite