Magnetic and Electric Properties of Sr_2−𝑥Y_𝑥CoO₄, (0.50≤𝑥≤0.80) Layered Perovskites

Table 1

Magnetic and electrical parameters of Sr_2−𝑥Y_𝑥CoO₄, 0.50≤𝑥≤0.80. Listed are the Curie-Weiss temperature, 𝑇_𝜃, the effective paramagnetic moment, μ_eff, remnant magnetization, 𝑀_𝑟, coercive field, 𝐻_co, maximum magnetization at 5 K, 𝑀_max,5K, the room temperature resistivity, 𝜌_300K, the fitting parameters according to 2D-VRH, and the activation energy, 𝐸, of the thermally activated part.

𝑥=	0.50	0.60	0.70	0.80
𝑇𝜃 (K)	139.73 ± 0.99	134.12 ± 1.1	−14.32 ± 1.2	−61.91 ± 0.59
μeff (μ𝐵/ion)	4.15 ± 0.29	3.29 ± 0.16	4.24 ± 0.29	4.81 ± 0.25
𝑀𝑟 (μ𝐵)	1.0	0.33	0.06	0.01
𝐻co (T)	1.6	0.8	0.4	0.1
𝑀max,5K (μ𝐵)	1.24	0.87	0.61	0.53
𝜌300K (Ω cm)	1.03	1.47	14.32	7.18
𝜌0 (Ω cm)	0.02	0.14	1.38	0.33
𝑇0 × 10^3 (K)	1.0	1.4	73.8	2.6
𝐸 (eV)	0.45 ± 0.03	0.53 ± 0.04	1.46 ± 0.09	0.61 ± 0.035