Conduction electrons as dissipation channel in friction experiments at the metal-metal transition of LSMO measured by contact-resonance atomic force microscopy

Pfahl, V.; Phani, M. Kalyan; Büchsenschütz-Göbeler, M.; Kumar, Anish; Moshnyaga, V.; Arnold, W.; Samwer, K.

doi:10.1063/1.4975072

Cited by 8 publications

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References 28 publications

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“…Thus, contact dynamics appear to entirely control the temperature dependence of the friction response in this case, while the metal-to-insulator transition in the buried film is not detected. It is conceivable that contributions from the transition in the underlying material might be detected more strongly for larger normal forces [8,27]. Ns/m, where F is the excess friction force due to the change in resistive state and v the scanning velocity [2].…”

Section: Figurementioning

confidence: 99%

Switching friction at a manganite surface using electric fields

Schmidt

Krisponeit

Weber

et al. 2020

Phys. Rev. Materials

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We report active control of the friction force at the contact between a nanoscale asperity and a La0.55Ca0.45MnO3 (LCMO) thin film using electric fields. We use friction force microscopy under ultrahigh vacuum conditions to measure the friction force as we change the film resistive state by electric field-induced resistive switching. Friction forces are high in the insulating state and clearly change to lower values when the probed local region is switched to the conducting state. Upon switching back to an insulating state, the friction forces increase again. Thus, we demonstrate active control of friction without having to change the contact temperature or pressure. By comparing with measurements of friction at the metal-to-insulator transition and with the effect of applied voltage on adhesion, we rule out electronic excitations, electrostatic forces and changes in contact area as the reasons for the effect of resistive switching on friction. Instead, we argue that friction is limited by phonon relaxation times which are strongly coupled to the electronic degrees of freedom through distortions of the MnO6 octahedra. The concept of controlling friction forces by electric fields should be applicable to any materials where the field produces strong changes in phonon lifetimes.Friction is a complex phenomenon that occurs between two bodies at a sliding contact.Despite the fact that it often can be described by straight-forward empirical relations, its fundamental cause is by no means simple. With the advent of the atomic force microscope (AFM), understanding and controlling nanoscale friction has become one of the major interests in modern tribology. A promising direction is reported in several literature studies [1-8] which show a clear change in measured nanoscale friction force when the electronic state of the material is altered. Abrupt increases are observed in the non-contact dissipation of Nb [5] and the contact friction of YBCO [6] and Pb [1,8] as the materials are heated through their superconducting transitions. Contact friction measurements on Si [4] and GaAs [2] semiconductors demonstrate a strong dependence on the charge carrier density, while the contact friction of VO2 is strongly increased on heating through the metal-to-insulator transition (MIT) from the insulating to the metallic state [3,7].

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Section: Figurementioning

confidence: 99%

Switching friction at a manganite surface using electric fields

Schmidt

Krisponeit

Weber

et al. 2020

Phys. Rev. Materials

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“…Peakleistung, Fluenz und Photonendichte beziehen sich dabei jeweils auf einen Puls.die Magnetisierungsänderung sehr langsam stattfindet. Tatsächlich fanden auch Pfahl et al[Pfa+17] in ihren Reibungsexperimenten mithilfe von Rasterkraftmikroskopie (engl. Atomic Force Microscopy (AFM)) bei LSMO eine Änderung der Reibungskräfte in Abhängigkeit der Temperatur, die sie ebenfalls auf den Wechsel der Relaxationszeiten am Übergang aufgrund der Schließung des Dissipationskanals zurückführen.…”

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Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

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Universal aspects of sonolubrication in amorphous and crystalline materials

Pfahl

Arnold

et al. 2018

Journal of Applied Physics

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We studied sonolubricity, a phenomenon reducing the friction between two sliding surfaces by ultrasound. Friction force measurements were performed using an atomic force microscope (AFM) when the tip-surface contact was excited to out-of-plane oscillations by a transducer attached to the rear of the sample or by oscillating the AFM cantilever by the built-in piezoelectric element in the cantilever holder. Experiments were carried out near or at the first cantilever contact-resonance. We studied friction on crystalline and amorphous Pd77.5Cu6Si16.5 ribbons, on a silicon wafer at room temperature, and on a La0.6Sr0.4MnO3 (LSMO) thin film at different temperatures. Measurements were carried out varying the cantilever amplitude, the ultrasonic frequency, and the normal static load. The effect of sonolubrication is explained by the non-linear force-distance curve between the sample and the tip due to the local interaction potential. The reduction of friction in LSMO as a function temperature is due to the direct coupling of the tip's stress-field to the electrons.

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Conduction electrons as dissipation channel in friction experiments at the metal-metal transition of LSMO measured by contact-resonance atomic force microscopy

Cited by 8 publications

References 28 publications

Switching friction at a manganite surface using electric fields

Switching friction at a manganite surface using electric fields

Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten

Universal aspects of sonolubrication in amorphous and crystalline materials

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