Memory and rejuvenation effect on the cluster-glass phase of 1-D spin-chain compound Ca₃Co_2–xBi_xO₆

Abstract

We studied the structural, static, and dynamic properties of Ca3Co2–xBixO6 (x = 0 and 0.2) by means of powder X-ray diffraction and magnetization measurements. We reveal the rejuvenation phenomena in magnetic relaxation under cyclic temperature change and quenching below T c2. The reproduced step in the memory curve confirms the striking feature of rejuvenation effect in these samples. The observed memory and rejuvenation effects are discussed in the framework of hierarchical model of glassy phase.

Spin-state transition of Co ion (S = 2 → S = 5/2) in hole substituted 1D chain of Ca3Co2O6

“…Since there are many reports available for other compounds in which a non-magnetic ion substitution in the replacement of a magnetic ion can bring frustration and exotic features in the magnetic properties [26,27]. Similar to this, we have observed the enhancement of glassy feature due to nonmagnetic Bi-substitution in our system [28]. The only drawback with Bi 3+ ion substitution is that it has the same oxidation state as Co 3+ ion, which limits the modification in this system from electronic structure point of view.…”

Correlation between magnetic and dielectric anomalies arising due to spin-chain arrangements in the paramagnetic phase of 1D Ca3Co1.9Bi0.1O6

“…3(a)) for Ca 3 Co 1.9 Bi 0.1 O 6 compound. For the sake of completeness, we want to mention that this compound undergoes two transitions the partially disordered antiferromagnetic phase (T c1 = 23 K) and the short-range glassy state (T c2 = 10.3 K) [9,15,16]. However, the scope of this work lies much above these temperatures.…”