Tuning bad metal and non-Fermi liquid behavior in a Mott material: Rare-earth nickelate thin films

Mikheev, Evgeny; Hauser, Adam J.; Himmetoḡlu, Burak; Moreno, Nelson E.; Janotti, Anderson; Walle, Chris G. Van de; Stemmer, Susanne

doi:10.1126/sciadv.1500797

Cited by 103 publications

(141 citation statements)

References 68 publications

(131 reference statements)

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“…After confirming the high structural and morphological quality, we have investigated the electrical transport of the films. As reported earlier 28,31,38 , 15 uc NNO thin film on NGO substrate undergoes first order MIT (upper panel of Fig. 3(a)).…”

supporting

confidence: 83%

“…The quest to understand the origin of these transitions have led to remarkable progress in epitaxial stabilization of RENiO 3 family (see Refs. 25 and 26, and literature cited therein), and thin films of RENiO 3 with RE=La, Pr, Nd, Sm, and Eu have been stabilized so far [25][26][27][28][29][30][31][32][33][34] . This further provides a unique opportunity to verify the role of disorder vs. t avg , in determining the electronic and magnetic properties of perovskite HEO with a strong disorder at the A site.In this letter, we report successful layer-by-layer epitaxial growth of (La 0.2 Pr 0.2 Nd 0.2 Sm 0.2 Eu 0.2 )NiO 3 [(LPNSE)NO] thin films on a single crystalline NdGaO 3 (NGO) substrate by pulsed laser deposition (PLD).…”

mentioning

confidence: 98%

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Epitaxial stabilization of ultra thin films of high entropy perovskite

Patel

Ojha

Kumar

et al. 2020

Applied Physics Letters

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High entropy oxides (HEOs) are a class of materials, containing equimolar portions of five or more transition metal and/or rare-earth elements. We report here about the layer-by-layer growth of HEO [(La 0.2 Pr 0.2 Nd 0.2 Sm 0.2 Eu 0.2 )NiO 3 ] thin films on NdGaO 3 substrates by pulsed laser deposition. The combined characterizations with in-situ reflection high energy electron diffraction, atomic force microscopy, and X-ray diffraction affirm the single crystalline nature of the film with smooth surface morphology. The desired +3 oxidation of Ni has been confirmed by an element sensitive X-ray absorption spectroscopy measurement. Temperature dependent electrical transport measurements revealed a first order metal-insulator transition with the transition temperature very similar to the undoped NdNiO 3 . Since both of these systems have a comparable tolerance factor, this work demonstrates that the electronic behaviors of A-site disordered perovskite-HEOs are primarily controlled by the average tolerance factor.Finding new materials and new ways to tune material's properties are essential to fulfill the demand of the constantly evolving modern technology. Transition metal oxides show various fascinating electronic and magnetic phenomena such as metal-insulator transition, superconductivity, colossal magnetoresistance, multiferroicity, skyrmions, etc., which have lots of prospect for technological applications 1-6 . Furthermore, transition metal (TM) based high entropy oxides (HEOs) are being explored in recent years to achieve tunable properties in unexplored parts of complex phase diagram 7-21 . In general, the configurational entropy of a multi-component solid solution can be enhanced by mixing a large number of cations in equiatomic proportions and a single structural phase is formed if the entropy contribution overcomes enthalpy driven phase separation (∆G mix =∆H mix -T ∆S mix ; ∆G mix , ∆H mix , ∆S mix are Gibbs free energy, enthalpy and entropy of mixing, respectively) 7,18 . After the report of the first HEO [Mg 0.2 Ni 0.2 Co 0.2 Cu 0.2 Zn 0.2 O with rocksalt structure] by Rost et al. 7 , HEOs with other structural symmetry such as perovskite 15,17 , spinel 16 have been also synthesized. However, this promising field of HEO is at a very early stage and most of the aspects of HEOs are yet to be explored experimentally. For example, it is still unknown whether the strong disorder or the average tolerance factor (t avg ) determines the electronic and magnetic behaviors of perovskite-HEOs.As a prototypical example of perovskite (ABO 3 ) series, RENiO 3 (RE= La, Pr, Nd, Sm, Eu...Lu) exhibits an interesting phase diagram as a function of tolerance factor (t= R RE +RO √ 2(RNi+RO) , where R RE , R Ni , R O are radii of RE, Ni and O, respectively) 22,23 . LaNiO 3 , the least distorted member of this series remains metallic and paramagnetic down to the lowest temperature. Bulk PrNiO 3 and NdNiO 3 (NNO) show temperature driven simultaneous transitions from an orthorhombic, paramagnetic, metallic phase to a monoclini...

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supporting

confidence: 83%

mentioning

confidence: 98%

Epitaxial stabilization of ultra thin films of high entropy perovskite

Patel

Ojha

Kumar

et al. 2020

Applied Physics Letters

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“…5(a)). Similar suppression of MIT has been also reported for PrNiO3, NdNiO3, SmNiO3 and EuNiO3 thin films [21,59,61,62,75,76]. To understand this strain effect, O K-edge resonant x-ray absorption spectra were measured at room temperature on these SLs [77].…”

Section: Effect Of Epitaxial Strainsupporting

confidence: 76%

Probing Electronic and Magnetic Transitions of Short Periodic Nickelate Superlattices Using Synchrotron X-rays

Middey

Patel

Meyers

et al. 2020

Synchrotron Radiation News

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Introduction: Transition metal based oxide heterostructures exhibit diverse emergent phenomena e.g. two dimensional electron gas, superconductivity, non-collinear magnetic phase, ferroelectricity, polar vortices, topological Hall effect etc., which are absent in the constituent bulk oxides [1-6]. The microscopic understandings of these properties in such nanometer thick materials are extremely challenging. Synchrotron x-ray based techniques such as x-ray diffraction, x-ray absorption spectroscopy (XAS), resonant x-ray scattering (RXS), resonant inelastic x-ray scattering (RIXS), x-ray photoemission spectroscopy, etc. are essential to elucidating the response of lattice, charge, orbital, and spin degrees of freedoms to the heterostructuring [7-14]. As a prototypical case of complex behavior, rare-earth nickelates SM is funded by a DST Nanomission grant (DST/NM/NS/2018/246) and a SERB Early

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“…Previous studies found that the resistivity of LNO shows a T 1.5 power law at temperatures above about 30 K, 8,13,15 and anomalous exponents have been observed in other nickelates 16,17 . Similar behavior is observed here as we saw in Fig.…”

Section: Introductionmentioning

confidence: 78%

Observation of an antiferromagnetic quantum critical point in high-purity LaNiO3

et al. 2020

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Amongst the rare-earth perovskite nickelates, LaNiO 3 (LNO) is an exception. While the former have insulating and antiferromagnetic ground states, LNO remains metallic and non-magnetic down to the lowest temperatures. It is believed that LNO is a strange metal, on the verge of an antiferromagnetic instability. Our work suggests that LNO is a quantum critical metal, close to an antiferromagnetic quantum critical point (QCP). The QCP behavior in LNO is manifested in epitaxial thin films with unprecedented high purities. We find that the temperature and magnetic field dependences of the resistivity of LNO at low temperatures are consistent with scatterings of charge carriers from weak disorder and quantum fluctuations of an antiferromagnetic nature. Furthermore, we find that the introduction of a small concentration of magnetic impurities qualitatively changes the magnetotransport properties of LNO, resembling that found in some heavy-fermion Kondo lattice systems in the vicinity of an antiferromagnetic QCP.

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Tuning bad metal and non-Fermi liquid behavior in a Mott material: Rare-earth nickelate thin films

Abstract: This work elucidates unconventional metallic behavior and metal-insulator transitions in a strongly correlated materials system.

Cited by 103 publications

References 68 publications

Epitaxial stabilization of ultra thin films of high entropy perovskite

Epitaxial stabilization of ultra thin films of high entropy perovskite

Probing Electronic and Magnetic Transitions of Short Periodic Nickelate Superlattices Using Synchrotron X-rays

Observation of an antiferromagnetic quantum critical point in high-purity LaNiO3

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