Influence of Cu doping and thickness on non-Fermi liquid behaviour and metallic conductance in epitaxial PrNiO3 thin films

Yadav, Ekta; Harisankar, S.; Soni, Kartik; Mavani, K. R.

doi:10.1007/s00339-018-2038-y

Cited by 7 publications

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References 31 publications

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“…In nickelates, different n exponents of the resistivity as a function of temperature have been reported 14,25,[41][42][43][44][45][46] . Linear dependence with temperature has been measured in the whole Nd x La 1−x NiO 3 series in ceramic pellets 41 .…”

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Tunable resistivity exponents in the metallic phase of epitaxial nickelates

et al. 2020

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We report a detailed analysis of the electrical resistivity exponent of thin films of NdNiO 3 as a function of epitaxial strain. Thin films under low strain conditions show a linear dependence of the resistivity versus temperature, consistent with a classical Fermi gas ruled by electronphonon interactions. In addition, the apparent temperature exponent, n, can be tuned with the epitaxial strain between n = 1 and n = 3. We discuss the critical role played by quenched random disorder in the value of n. Our work shows that the assignment of Fermi/Non-Fermi liquid behaviour based on experimentally obtained resistivity exponents requires an in-depth analysis of the degree of disorder in the material.

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Tunable resistivity exponents in the metallic phase of epitaxial nickelates

et al. 2020

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“…In the metallic state, the resistivity as a function of temperature can be described as [24,25]: where ρ 0 is residual resistivity which is a temperature-independent term, existing due to lattice imperfections, impurities, grain boundary contributions, etc, ρ n governs the strength of electron-electron interactions, and n is an adjustable parameter. According to the classical Fermi liquid model, the value of exponent n remains 2, which explains the quadratic dependence of resistivity over temperature [21].…”

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X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films

Yadav,

Prajapati,

Rajput

et al. 2023

New J. Phys.

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The disorder due to anti-site cation distribution is intrinsic to the double perovskites wherein the crystal orientations of the substrate template are predicted to offer different degrees of cation order in thin film form. To demonstrate this effect, epitaxial thin films of half-metallic double perovskite Ca2FeMoO6 (CFMO) were prepared on (100) and (111) oriented LaAlO3 substrates in vacuum and nitrogen atmospheres. The findings using X-ray absorption near-edge structure, Terahertz (THz) and Raman spectroscopies, in combination with magnetization show that (111) epitaxial template effectively restricts the Fe–Mo anti-site cation disorder. A resultantly enhanced cation order in (111) films induces dramatic transformations in its properties as follows: (i) significantly enhanced ferromagnetic exchange interactions and saturation magnetization, (ii) a significant increase in the Curie temperatures, (iii) a metallic behavior down to much lower temperature (∼75 K) compared to that down to 200 K for (100) film, (iv) an enhanced spin–phonon coupling. The complex THz optical conductivity spectra evaluated in the framework of Drude and Drude–Smith phenomenological models and the temperature-dependent Raman data fitted to the Balkanski model corroborate well to indicate an enhanced cation order in (111) films. While this study establishes a dominant role of crystallographic orientation in the much-desired control of cation order in double perovskites, a demonstration of the same in room temperature half-metallic CFMO system could reinforce its technological utility both as active and passive components in emergent spintronic functionalities.

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Systematic effects of Ti doping on the electronic properties of LaNiO3 thin films

et al. 2021

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Influence of Cu doping and thickness on non-Fermi liquid behaviour and metallic conductance in epitaxial PrNiO3 thin films

Cited by 7 publications

References 31 publications

Tunable resistivity exponents in the metallic phase of epitaxial nickelates

Tunable resistivity exponents in the metallic phase of epitaxial nickelates

X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films

Systematic effects of Ti doping on the electronic properties of LaNiO3 thin films

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Influence of Cu doping and thickness on non-Fermi liquid behaviour and metallic conductance in epitaxial PrNiO3 thin films

Cited by 7 publications

References 31 publications

Tunable resistivity exponents in the metallic phase of epitaxial nickelates

Tunable resistivity exponents in the metallic phase of epitaxial nickelates

X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca2FeMoO6 thin films

Systematic effects of Ti doping on the electronic properties of LaNiO3 thin films

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X-ray absorption near-edge, terahertz and Raman spectroscopies evidence growth-orientation dependent cation order, phase transitions and spin–phonon coupling in half-metallic Ca₂FeMoO₆ thin films