Strain wave pathway to semiconductor-to-metal transition revealed by time-resolved X-ray powder diffraction

Mariette, Céline; Lorenc, Maciej; Cailleau, H.; Collet, Éric; Guérin, Laurent; Volte, Alix; Trzop, Elżbieta; Bertoni, Roman; Xu, Dan; Lépine, Bruno; Hernandez, Olivier; Janod, Étienne; Cario, Laurent; Phuoc, V. Ta; Ohkoshi, Shin‐ichi; Tokoro, Hiroko; Patthey, L.; Babič, Andrej; Usov, Ivan; Ozerov, D.; Sala, L.; Ebner, Simon Gregor; Böhler, P.; Keller, A.; Oggenfuss, A.; Zmofing, T.; Redford, S.; Vetter, S.; Follath, R.; Juranić, Pavle; Schreiber, Akos; Beaud, P.; Esposito, Vincent; Deng, Yunpei; Ingold, G.; Chergui, Majed; Mancini, Giulia F.; Mankowsky, Roman; Svetina, Cristian; Zerdane, Serhane; Mozzanica, A.; Bosak, Alexeï; Wulff, Michaël; Levantino, Matteo; Lemke, H.; Cammarata, Marco

doi:10.1038/s41467-021-21316-y

Cited by 45 publications

(51 citation statements)

References 39 publications

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“…These are especially troublesome as emerging types of neuromorphic computing elements rely on the unique characteristics of memristors to mimic the spike timing and continuously variable weights of neurons in our human brains [3][4][5]. The memristive capabilities of phase change materials such as the metal insulator transitional VO 2 and V 2 O 3 are prime candidates for this next generation [6][7][8]. However, they are hindered by the same endurance issues associated with classical memristors due to electric field oxygen migration [9].…”

Section: Introductionmentioning

confidence: 99%

N+ Irradiation and Substrate-Induced Variability in the Metamagnetic Phase Transition of FeRh Films

et al. 2021

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Metamagnetic FeRh has been the focus of numerous studies for its highly unique antiferromagnetic (AF) to ferromagnetic (FM) metamagnetic transition. While this phase transition usually occurs above room temperature (often Tc > 400 K), both ion irradiation and strained epitaxial growth have been used to bring it to applicable temperatures. Nevertheless, cross sample variability is pervasive in these studies. Here we explore the optical and magnetic properties of 35 nm thick FeRh grown by magnetron sputter deposition simultaneously on two different single crystal substrates: epitaxially on MgO (001) and highly strained with large lattice mismatch on Al2O3 (1000). We then irradiate the epitaxial film with 5 keV N+ ions to introduce disorder (and to a lesser extent, modify chemical composition) without effecting the surface morphology. We find that the phase-transitional properties of both films are strikingly different due to the large lattice mismatch, despite being grown in tandem with nominally identical growth conditions including Fe/Rh stoichiometry, pressure, and temperature. We observe that N+ implantation lowers Tc by ~60 K, yielding a sample with nominally the same transition temperature as the non-epitaxial film on sapphire, yet with a significantly increased magnetic moment, a larger magnetization change and a more abrupt transition profile. We attribute these differences to the Volmer-Weber type growth mode induced by the sapphire substrate and the resulting rougher surface morphology.

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Section: Introductionmentioning

confidence: 99%

N+ Irradiation and Substrate-Induced Variability in the Metamagnetic Phase Transition of FeRh Films

et al. 2021

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“…In such a case, the transformation implies only ultrafast structural dynamics of atomic displacements on the optical phonon time scale. Those dynamics follow the propagation of volume expansion as observed recently in another isostructural transformation [Mariette2021]. In the case of SCO, the volume must be sufficiently expanded to promote the thermally activated transformation towards the HS phase at the macroscopic scale.…”

Section: Discussionmentioning

confidence: 52%

Dynamical limits by downsizing for the photo-induced switching in a molecular material revealed by time-resolved X-ray diffraction

Volte

Mariette

Bertoni

et al. 2021

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Cooperative molecular switching at the solid state is exemplified by spin crossover phenomenon in crystals of transition metal complexes. Time-resolved studies with temporal resolutions that separate molecular level dynamics from macroscopic changes, afford clear distinction between the time scales of the different degrees of freedom involved. In this work we use 100 ps X-ray diffraction to follow simultaneously the molecular spin state and the structure of the lattice during the photoinduced low spin to high spin transition in microcrystals of [FeIII(3-MeO-SalEen)2]PF6. We show the existence of a delay between the crystalline volume increase driven by the propagation of collective volumic strain waves, and the cooperative macroscopic switching of molecular state. Such behaviour is different from the expectation that phase transformation only requires atomic displacements in the unit cell, that can occur simultaneously with propagation of a volumic strain. Model simulations and discussions of the physical picture explain the phenomenon with thermally activated kinetics governed by local energy barriers separating the molecular states.

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“…The unique combination of high-brilliance and ultra-short pulses delivered by Xray free electron lasers (XFELs) has opened up new possibilities for studying complex phenomena in physics [1], chemistry [2,3], biology [4,5], material science [6], as well as many other disciplines. The modern XFEL sources generate tunable femtosecond X-ray pulses with energies of up to tens of millijoules at wavelengths down to the Ångström level, enabling time-resolved measurements of structural and electronic dynamics down to femtosecond time scales [7,8].…”

Section: Introductionmentioning

confidence: 99%

Resonant X-ray Emission Spectroscopy with a SASE Beam

et al. 2021

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Aqueous iron (III) oxide nanoparticles were irradiated with pure self-amplified spontaneous emission (SASE) X-ray free-electron laser (XFEL) pulses tuned to the energy around the Fe K-edge ionization threshold. For each XFEL shot, the incident X-ray pulse spectrum and Fe Kβ emission spectrum were measured synchronously with dedicated spectrometers and processed through a reconstruction algorithm allowing for the determination of Fe Kβ resonant X-ray emission spectroscopy (RXES) plane with high energy resolution. The influence of the number of X-ray shots employed in the experiment on the reconstructed data quality was evaluated, enabling the determination of thresholds for good data acquisition and experimental times essential for practical usage of scarce XFEL beam times.

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Strain wave pathway to semiconductor-to-metal transition revealed by time-resolved X-ray powder diffraction

Cited by 45 publications

References 39 publications

N+ Irradiation and Substrate-Induced Variability in the Metamagnetic Phase Transition of FeRh Films

N+ Irradiation and Substrate-Induced Variability in the Metamagnetic Phase Transition of FeRh Films

Dynamical limits by downsizing for the photo-induced switching in a molecular material revealed by time-resolved X-ray diffraction

Resonant X-ray Emission Spectroscopy with a SASE Beam

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