Atomic scale spectral control of thermal transport in phononic crystal superlattices

Meyer, Dennis J.; Roddatis, Vladimir; Bange, Jan Philipp; Lopatin, Sergei; Keunecke, Marius; Metternich, Daniel; Roß, Ulrich; Maznichenko, I. V.; Ostanin, S.; Mertig, Ingrid; Radisch, V.; Egoavil, Ricardo; Lazić, Ivan; Moshnyaga, V.; Ulrichs, Henning

doi:10.48550/arxiv.2009.14532

Cited by 2 publications

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“…At this point we speculate that the transferred electrons into the SMO help to relax the LMO by reducing the tetragonal distortion by means of MnO 6 octahedral tilt mechanism. According to the recent study of Meyer et al [19] the main structural difference between the present SL1 and SL2 samples is the existence of octahedral tilts in the LMO layers within the m/n = 2 SLs and their absence in the m/n = 1 SLs. The presence of tilts is consistent with an increased averaged C av -lattice parameter measured for the SL2 samples (see Table 1) and, hence, with a decreased tetragonal distortion in them.…”

Section: Discussionmentioning

confidence: 60%

“…A detailed study of crystal structure, including the quantitative analysis of the MnO 6 octahedral tilts in the LMO layers, is presented. [19] Magnetization was measured by using a SQUID magnetometer (MPMS XL, Quantum Design) for temperatures, T = 5-400 K and applied magnetic fields, B = 0-5 T, aligned parallel to the film surface.…”

Section: Sample Preparation and Experimental Detailsmentioning

confidence: 99%

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Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces

Bange

Roddatis

Schüler

et al. 2022

Adv Materials Inter

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cial magnetic and electric phenomena [1][2][3][4] not present in the constituting layers. As the interplay of charge, spin, and lattice degrees of freedom [5] is believed to control phase transitions in bulk correlated materials, their interfacial reconstructions, should serve as guiding mechanisms for emergent phenomena. In particular, the charge transfer (CT)/leakage at the interface [6,7] with a following electronic reconstruction of them was thought to be intimately coupled to the formation of emergent phases. The (LaMnO 3 ) m / (SrMnO 3 ) n (LMO m /SMO n ) SLs can be viewed as one of the most intensively studied oxide heterostructures. [8,9] A longterm interest to them was motivated by the observations of interfacial or emergent ferromagnetism, [10][11][12][13][14] associated with the chemically sharp LMO(top)/SMO(bottom) interfaces. [10] Very recently, we reported a high temperature emergent ferromagnetic phase with Curie temperature T C = 360 K at the SMO/ LMO interfaces, [15] originated from the interfacial CT from the electron-rich LMO to the electron-poor SMO layers.An important but rather rarely addressed question is whether CT can be additionally influenced or controlled by the growth design of SLs, e.g. by tuning the thickness ratio of constituting layers. Garcia-Barriocanal et al. [7] have demonstrated that charge leakage in (LaMnO 3 ) m /(SrTiO 3 ) n (LMO m /STO n ) SLs, indicated by the formation of Ti 3+ within the STO layers, is favored in the SLs with a large thickness ratio LMO 17 /STO 2 and is suppressed when this ratio is small LMO 17 /STO 12 . Moreover, the LMO layers in SLs with a large thickness ratio (17/2) were found to be relaxed but those in SLs with small ratio (7/5) were coherently strained. Likely, a correlation between the CT and strain state in the LMO/STO SLs could be envisioned. In addition, it is known that magnetic properties of, e.g., LMO 6 /SMO 4 SLs, [13] can be influenced by the epitaxy strain actuated by the chosen substrate, i.e., STO, LSAT, or LaAlO 3 (LAO). Namely, a small tensile strain in case of STO (a STO = 0.3905 nm) or an almost strain-free state for the lattice matched LSAT (a LSAT = 0.3868 nm) both promote ferromagnetism. In contrast, a compressive strain produced by the LAO substrate (a LAO = 0.3787 nm) suppresses ferromagnetic ground state. However, the development of emergent magnetic phenomena in a wide range of LMO m /SMO n compositions and layer thicknesses as well as the correlations between the lattice structure and strain state of SLs are far from being well understood. Moreover, a possibility to control CT by growth design Emergent phases at the interfaces in strongly correlated oxide heterostructures display novel properties not akin to those of constituting materials. The interfacial ferromagnetism in (LaMnO 3 ) m /(SrMnO 3 ) n (LMO) m /(SMO) n superlattices (SLs) with antiferromagnetic bulk LMO and SMO layers is believed to be a result of the interfacial charge transfer (CT). By using in situ optical ellipsometry, it is demonstrated directly that ...

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Section: Discussionmentioning

confidence: 60%

Section: Sample Preparation and Experimental Detailsmentioning

confidence: 99%

Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces

Bange

Roddatis

Schüler

et al. 2022

Adv Materials Inter

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show abstract

“…3.6) and exhibit vastly different thermal and magnetic properties in respect to their m/n-ratio. [117] 0.0 0.1 0.2 Interface density c/ [117] revealed a scaling of the thermal properties with respect to the interface density c/λ = 1 /(n + m). The data, provided by the authors (circles and triangles) was used to estimate the thermal resistivity for the samples studied in this work (diamonds).…”

Section: Superlatticesmentioning

confidence: 98%

“…One class of materials that has these properties are so-called superlattice samples, which enable the phonon mean free path to be varied by introducing interfaces. [114][115][116][117] Seven films, consisting of alternating [LaMnO 3 ] m and [SrMnO 3 ] n -layers, where m, n corre-1 Institute of Materials Physics, University of Göttingen, Friedrich-Hund-Platz 1, Göttingen 37077, Germany -AG C. Jooss 2 1st Physics Institute, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany -AG V. Moshnyaga spond to the number of layers, were used in the present work to clarify open questions arising from the temperature dependent friction measurements, [2] as well as friction studies that used resistive switching at the surface, as a control technique. [1] The samples used were prior to this work characterized by thermal transient reflectometry (TTR) measurements (see fig.…”

Section: Superlatticesmentioning

confidence: 99%

“…We further observe no correlation between friction and the thermal properties of our films. [117,187] This enables us to rule out thermal conductivity, and thus high-frequency phonons, as the dominant contribution to friction in our systems. From the observed thickness dependence of the friction coefficients, we develop a model connecting friction to the energy losses occurring in the stressed volume near the contact interface through thermoelastic damping.…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale Friction Measurements on Manganite Thin Films: Which Material Properties are Important?

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Atomic scale spectral control of thermal transport in phononic crystal superlattices

Cited by 2 publications

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Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces

Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces

Nanoscale Friction Measurements on Manganite Thin Films: Which Material Properties are Important?

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Atomic scale spectral control of thermal transport in phononic crystal superlattices

Cited by 2 publications

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Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3 Interfaces

Charge Transfer Control of Emergent Magnetism at SrMnO3/LaMnO3 Interfaces

Nanoscale Friction Measurements on Manganite Thin Films: Which Material Properties are Important?

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Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces

Charge Transfer Control of Emergent Magnetism at SrMnO₃/LaMnO₃ Interfaces