Magnetic glassy state at low spin state of Co3+ in EuBaCo2O5+{\delta} ({\delta} = 0.47) cobaltite

TL;DR

This study reveals a magnetic glassy state in EuBaCo2O5+{ extdelta} cobaltite at low temperatures, caused by kinetic arrest of a first-order magnetic phase transition in the low spin state of Co3+ ions.

Contribution

It demonstrates the existence of a magnetic glassy state linked to spin state transitions and kinetic arrest in a cobaltite material, providing new insights into magnetic phase behavior.

Findings

Magnetic glassy state observed below 60 K.

Significant entropy change associated with the arrested phase.

Kinetic arrest confirmed through magnetization relaxation and thermal cycling.

Abstract

The magnetic glassy state is a fascinating phenomenon, which results from the kinetic arrest of the first order magnetic phase transition. Interesting properties, such as metastable magnetization and nonequilibrium magnetic phases, are naturally developed in the magnetic glassy state. Here, we report magnetic glass property in the low spin state of Co3+ in EuBaCo2O5+{\delta} ({\delta} = 0.47) cobaltite at low temperature (T < 60 K). The measurements of magnetization under the cooling and heating in unequal fields, magnetization relaxation and thermal cycling of magnetization show the kinetic arrest of low magnetization state below 60 K. The kinetically arrested low temperature magnetic phase is further supported through the study of isothermal magnetic entropy, which shows the significant entropy change. The present results will open a new window to search the microscopic relation between the spin state transitions and the kinetic arrest induced magnetic glassy phenomena in complex materials.