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Title: | Investigating the cause of crossover from charge/spin-stripe insulator to correlated metallic phase in layered πβ² nickelates π 4β’Ni3β’O8 (π =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 (πβ²) nickelates have recently garnered significant attention due to the discovery of superconductivity in hole-doped π β’NiO2 (π =La,Pr,orNd), which is the π=β member of the series π π+1β’Niπβ’O2β’π+2. Here, we investigate the π=3 member, namely π 4β’Ni3β’O8 (π =La,Pr,orNd), of this family. The compound La4β’Ni3β’O8 exhibits simultaneous charge/spin-stripe ordering at π*π = 105 K, which occurs concomitantly with the onset of the metal-to-insulator (MIT) transition below π*π. We investigate the conspicuous absence of this transition in the Pr and Nd analogs of La4β’Ni3β’O8. For this purpose, we synthesized solid solutions of the form (La,Pr)4β’Ni3β’O8 and (La,Nd)4β’Ni3β’O8, and examined the behavior of π*π as a function of the average π -site ionic radius (πβΎπ ). We show that after an initial quasilinear decrease with decreasing πβΎπ , π*π suddenly vanishes in the narrow range 1.134β€πβΎπ β€1.143Γ . In the same range, we observed the emergence of a weak anomaly in the specific heat, whose onset temperature (π*) increases as πβΎπ further decreases reaching a maximum of 13 K for Nd4β’Ni3β’O8. We suggest, therefore, that the sudden vanishing of charge/spin-stripe/MIT ordering upon decreasing πβΎπ is related to the appearance of this new electronic phase for πβΎπ <ππ. The nature of this phase or the weak anomaly and the point πβΎπ βππ, where π*π vanishes and π* appears, should be investigated further. In this regard, Pr4β‘Ni3β’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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