| dc.description |
The temperature-dependent normal state resistivity of single-crystal Nd<sub>1.85</sub>Ce<sub>0.15</sub>CuO<sub>4−δ</sub> is theoretically analysed within the framework of the classical electron–phonon model of resistivity, i.e. the Bloch–Gruneisen model. Due to inherent acoustic (low-frequency) phonons (ω<sub>ac</sub>) as well as high-frequency optical phonons (ω<sub>op</sub>), the contributions to the resistivity have first been estimated. The optical phonons of the oxygen-breathing mode yield a relatively larger contribution to the resistivity compared to the contribution of acoustic phonons. The contribution to resistivity estimated by considering both phonons, i.e. ω<sub>ac</sub> and ω<sub>op</sub>, along with the zero limited resistivity, when subtracted from single-crystal data, infers a quadratic temperature dependence over most of the temperature range (25 ≤ T ≤ 300 K). The quadratic temperature dependence of ρ<sub>diff</sub> [ρ<sub>exp</sub> − {ρ<sub>0</sub> + ρ<sub>e-ph</sub>(ρ<sub>ac</sub> + ρ<sub>op</sub>)}] is understood in terms of electron–electron inelastic scattering. The comparison of single-crystal experimental data with the present analysis appears to be favourable. |
