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11 results on '"Valvidares, Manuel"'

3. Correction to “Imaging Nanometer Phase Coexistence at Defects During the Insulator–Metal Phase Transformation in VO2 Thin Films by Resonant Soft X-ray Holography”

Author

Vidas, Luciana, primary, Günther, Christian M., additional, Miller, Timothy A., additional, Pfau, Bastian, additional, Perez-Salinas, Daniel, additional, Martínez, Elías, additional, Schneider, Michael, additional, Gührs, Erik, additional, Gargiani, Pierluigi, additional, Valvidares, Manuel, additional, Marvel, Robert E., additional, Hallman, Kent A., additional, Haglund, Richard F., additional, Eisebitt, Stefan, additional, and Wall, Simon, additional

Published
2021
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4. Unraveling Dzyaloshinskii–Moriya Interaction and Chiral Nature of Graphene/Cobalt Interface

Author

Ajejas, Fernando, primary, Gudín, Adrian, additional, Guerrero, Ruben, additional, Anadón Barcelona, Alberto, additional, Diez, Jose Manuel, additional, de Melo Costa, Leticia, additional, Olleros, Pablo, additional, Niño, Miguel Angel, additional, Pizzini, Stefania, additional, Vogel, Jan, additional, Valvidares, Manuel, additional, Gargiani, Pierluigi, additional, Cabero, Mariona, additional, Varela, Maria, additional, Camarero, Julio, additional, Miranda, Rodolfo, additional, and Perna, Paolo, additional

Published
2018
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5. Imaging Nanometer Phase Coexistence at Defects During the Insulator–Metal Phase Transformation in VO2 Thin Films by Resonant Soft X-ray Holography

Author

Vidas, Luciana, primary, Günther, Christian M., additional, Miller, Timothy A., additional, Pfau, Bastian, additional, Perez-Salinas, Daniel, additional, Martínez, Elías, additional, Schneider, Michael, additional, Gührs, Erik, additional, Gargiani, Pierluigi, additional, Valvidares, Manuel, additional, Marvel, Robert E., additional, Hallman, Kent A., additional, Haglund, Richard F., additional, Eisebitt, Stefan, additional, and Wall, Simon, additional

Published
2018
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7. 2D Materials by Design: Intercalation of Cr or Mn between two VSe2van der Waals Layers

Author

Pathirage, Vimukthi, Khatun, Salma, Lisenkov, Sergey, Lasek, Kinga, Li, Jingfeng, Kolekar, Sadhu, Valvidares, Manuel, Gargiani, Pierluigi, Xin, Yan, Ponomareva, Inna, and Batzill, Matthias

Abstract

Insertion of metal layers between layered transition-metal dichalcogenides (TMDs) enables the design of new pseudo-2D nanomaterials. The general premise is that various metal atoms may adopt energetically favorable intercalation sites between two TMD sheets. These covalently bound metals arrange in metastable configurations and thus enable the controlled synthesis of nanomaterials in a bottom-up approach. Here, this method is demonstrated by the insertion of Cr or Mn between VSe2layers. Vacuum-deposited transition metals diffuse between VSe2layers with increasing concentration, arranging in ordered phases. The Cr3+or Mn2+ions are in octahedral coordination and thus in a high-spin state. Measured and computed magnetic moments are high for dilute Cr atoms, but with increasing Cr concentration the average magnetic moment decreases, suggesting antiferromagnetic ordering between Cr ions. The many possible combinations of transition metals with TMDs form a library for exploring quantum phenomena in these nanomaterials.

Published
2023
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8. Correction to “Imaging Nanometer Phase Coexistence at Defects During the Insulator–Metal Phase Transformation in VO2Thin Films by Resonant Soft X-ray Holography”

Author

Vidas, Luciana, Günther, Christian M., Miller, Timothy A., Pfau, Bastian, Perez-Salinas, Daniel, Martínez, Elías, Schneider, Michael, Gührs, Erik, Gargiani, Pierluigi, Valvidares, Manuel, Marvel, Robert E., Hallman, Kent A., Haglund, Richard F., Eisebitt, Stefan, and Wall, Simon

Published
2021
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9. 2D Materials by Design: Intercalation of Cr or Mn between two VSe 2 van der Waals Layers.

Author

Pathirage V, Khatun S, Lisenkov S, Lasek K, Li J, Kolekar S, Valvidares M, Gargiani P, Xin Y, Ponomareva I, and Batzill M

Abstract

Insertion of metal layers between layered transition-metal dichalcogenides (TMDs) enables the design of new pseudo-2D nanomaterials. The general premise is that various metal atoms may adopt energetically favorable intercalation sites between two TMD sheets. These covalently bound metals arrange in metastable configurations and thus enable the controlled synthesis of nanomaterials in a bottom-up approach. Here, this method is demonstrated by the insertion of Cr or Mn between VSe 2 layers. Vacuum-deposited transition metals diffuse between VSe 2 layers with increasing concentration, arranging in ordered phases. The Cr 3+ or Mn 2+ ions are in octahedral coordination and thus in a high-spin state. Measured and computed magnetic moments are high for dilute Cr atoms, but with increasing Cr concentration the average magnetic moment decreases, suggesting antiferromagnetic ordering between Cr ions. The many possible combinations of transition metals with TMDs form a library for exploring quantum phenomena in these nanomaterials.

Published
2023
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11. Imaging Nanometer Phase Coexistence at Defects During the Insulator-Metal Phase Transformation in VO 2 Thin Films by Resonant Soft X-ray Holography.

Author

Vidas L, Günther CM, Miller TA, Pfau B, Perez-Salinas D, Martínez E, Schneider M, Gührs E, Gargiani P, Valvidares M, Marvel RE, Hallman KA, Haglund RF Jr, Eisebitt S, and Wall S

Abstract

We use resonant soft X-ray holography to image the insulator-metal phase transition in vanadium dioxide with element and polarization specificity and nanometer spatial resolution. We observe that nanoscale inhomogeneity in the film results in spatial-dependent transition pathways between the insulating and metallic states. Additional nanoscale phases form in the vicinity of defects which are not apparent in the initial or final states of the system, which would be missed in area-integrated X-ray absorption measurements. These intermediate phases are vital to understand the phase transition in VO 2 , and our results demonstrate how resonant imaging can be used to understand the electronic properties of phase-separated correlated materials obtained by X-ray absorption.

Published
2018
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