Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity

Martino E, Arakcheeva A, Autès G, Pisoni A, Bachmann MD, Modic KA, Helm T, Yazyev OV, Moll PJW, Forró L, Katrych S. 2018. Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity. IUCrJ. 5(4), 470–477.

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Journal Article | Published | English
Author
Martino, Edoardo; Arakcheeva, Alla; Autès, Gabriel; Pisoni, Andrea; Bachmann, Maja D.; Modic, Kimberly AIST Austria ; Helm, Toni; Yazyev, Oleg V.; Moll, Philip J. W.; Forró, László; Katrych, Sergiy
Abstract
The high-pressure synthesis and incommensurately modulated structure are reported for the new compound Sr2Pt8−xAs, with x = 0.715 (5). The structure consists of Sr2Pt3As layers alternating with Pt-only corrugated grids. Ab initio calculations predict a metallic character with a dominant role of the Pt d electrons. The electrical resistivity (ρ) and Seebeck coefficient confirm the metallic character, but surprisingly, ρ showed a near-flat temperature dependence. This observation fits the description of the Mooij correlation for electrical resistivity in disordered metals, originally developed for statistically distributed point defects. The discussed material has a long-range crystallographic order, but the high concentration of Pt vacancies, incommensurately ordered, strongly influences the electronic conduction properties. This result extends the range of validity of the Mooij correlation to long-range ordered incommensurately modulated vacancies. Motivated by the layered structure, the resistivity anisotropy was measured in a focused-ion-beam micro-fabricated well oriented single crystal. A low resistivity anisotropy indicates that the layers are electrically coupled and conduction channels along different directions are intermixed.
Publishing Year
Date Published
2018-07-01
Journal Title
IUCrJ
Volume
5
Issue
4
Page
470-477
eISSN
IST-REx-ID

Cite this

Martino E, Arakcheeva A, Autès G, et al. Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity. IUCrJ. 2018;5(4):470-477. doi:10.1107/s2052252518007303
Martino, E., Arakcheeva, A., Autès, G., Pisoni, A., Bachmann, M. D., Modic, K. A., … Katrych, S. (2018). Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity. IUCrJ. International Union of Crystallography (IUCr). https://doi.org/10.1107/s2052252518007303
Martino, Edoardo, Alla Arakcheeva, Gabriel Autès, Andrea Pisoni, Maja D. Bachmann, Kimberly A Modic, Toni Helm, et al. “Sr2Pt8−xAs: A Layered Incommensurately Modulated Metal with Saturated Resistivity.” IUCrJ. International Union of Crystallography (IUCr), 2018. https://doi.org/10.1107/s2052252518007303.
E. Martino et al., “Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity,” IUCrJ, vol. 5, no. 4. International Union of Crystallography (IUCr), pp. 470–477, 2018.
Martino E, Arakcheeva A, Autès G, Pisoni A, Bachmann MD, Modic KA, Helm T, Yazyev OV, Moll PJW, Forró L, Katrych S. 2018. Sr2Pt8−xAs: A layered incommensurately modulated metal with saturated resistivity. IUCrJ. 5(4), 470–477.
Martino, Edoardo, et al. “Sr2Pt8−xAs: A Layered Incommensurately Modulated Metal with Saturated Resistivity.” IUCrJ, vol. 5, no. 4, International Union of Crystallography (IUCr), 2018, pp. 470–77, doi:10.1107/s2052252518007303.
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