Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9107
Title: Investigating the cause of crossover from charge/spin-stripe insulator to correlated metallic phase in layered π‘‡β€² nickelates π‘…4⁒Ni3⁒O8 (𝑅=La,Pr,orNd)
Authors: ROUT, DIBYATA
MUDI, SANCHAYETA RANAJIT
Karmakar, Suman
Rawat, Rajeev
SINGH, SURJEET
Dept. of Physics
Keywords: Magnetism
2024
2024-SEP-WEEK3
TOC-SEP-2024
Issue Date: Sep-2024
Publisher: American Physical Society
Citation: Physical Review B, 110(09), 094412.
Abstract: The infinite layered (𝑇′) nickelates have recently garnered significant attention due to the discovery of superconductivity in hole-doped π‘…⁒NiO2 (𝑅=La,Pr,orNd), which is the π‘›=∞ member of the series π‘…𝑛+1⁒Ni𝑛⁒O2⁒𝑛+2. Here, we investigate the π‘›=3 member, namely π‘…4⁒Ni3⁒O8 (𝑅=La,Pr,orNd), of this family. The compound La4⁒Ni3⁒O8 exhibits simultaneous charge/spin-stripe ordering at π‘‡*𝑁 = 105 K, which occurs concomitantly with the onset of the metal-to-insulator (MIT) transition below π‘‡*𝑁. We investigate the conspicuous absence of this transition in the Pr and Nd analogs of La4⁒Ni3⁒O8. For this purpose, we synthesized solid solutions of the form (La,Pr)4⁒Ni3⁒O8 and (La,Nd)4⁒Ni3⁒O8, and examined the behavior of π‘‡*𝑁 as a function of the average π‘…-site ionic radius (π‘Ÿβ€Ύπ‘…). We show that after an initial quasilinear decrease with decreasing π‘Ÿβ€Ύπ‘…, π‘‡*𝑁 suddenly vanishes in the narrow range 1.134β‰€π‘Ÿβ€Ύπ‘…β‰€1.143Γ…. In the same range, we observed the emergence of a weak anomaly in the specific heat, whose onset temperature (𝑇*) increases as π‘Ÿβ€Ύπ‘… further decreases reaching a maximum of 13 K for Nd4⁒Ni3⁒O8. We suggest, therefore, that the sudden vanishing of charge/spin-stripe/MIT ordering upon decreasing π‘Ÿβ€Ύπ‘… is related to the appearance of this new electronic phase for π‘Ÿβ€Ύπ‘…<π‘Ÿπ‘. The nature of this phase or the weak anomaly and the point π‘Ÿβ€Ύπ‘…β‰ˆπ‘Ÿπ‘, where π‘‡*𝑁 vanishes and π‘‡* appears, should be investigated further. In this regard, Pr4⁑Ni3⁒O8 and Pr-rich samples should be useful due to the weak magnetization response associated with the Pr sublattice, as shown here.
URI: https://doi.org/10.1103/PhysRevB.110.094412
http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/9107
ISSN: 2469-9969
2469-9950
Appears in Collections:JOURNAL ARTICLES

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