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1.
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8 p, 1.7 MB |
Tunable Molecular Electrodes for Bistable Polarization Screening
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Spasojevic, Irena (Universitat Autònoma de Barcelona. Departament de Química) ;
Santiso, José (Institut Català de Nanociència i Nanotecnologia) ;
Caicedo Roque, Jose Manuel (Institut Català de Nanociència i Nanotecnologia) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia) ;
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
The polar discontinuity at any ferroelectric surface creates a depolarizing field that must be screened for the polarization to be stable. In capacitors, screening is done by the electrodes, while in bare ferroelectric surfaces it is typically accomplished by atmospheric adsorbates. [...]
2023 -  10.1002/smll.202207799
Small, Vol. 19, Issue 30 (July 2023) , art. 2207799
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29 p, 1.5 MB |
Deconvolution of Phonon Scattering by Ferroelectric Domain Walls and Point Defects in a PbTiO3Thin Film Deposited in a Composition-Spread Geometry
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Bugallo, David (Universidade de Santiago de Compostela. Departamento de Química Física) ;
Langenberg, Eric (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia) ;
Ferreiro-Vila, Elias (Centro Singular de Investigacion en Quimica Bioloxica e Materiais Moleculares (CiQUS)) ;
Smith, Eva H. (Cornell University. Department of Materials Science and Engineering) ;
Stefani, Christina (Institut Català de Nanociència i Nanotecnologia) ;
Batlle, Xavier (Universitat de Barcelona. Departament de Física de la Matèria Condensada) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia) ;
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia) ;
Schlom, Darrell G. (Kavli Institute at Cornell for Nanoscale Science) ;
Rivadulla, Francisco (Universidade de Santiago de Compostela. Departamento de Química Física)
We present a detailed analysis of the temperature dependence of the thermal conductivity of a ferroelectric PbTiO3 thin film deposited in a composition-spread geometry enabling a continuous range of compositions from ∼25% titanium deficient to ∼20% titanium rich to be studied. [...]
2021 - 10.1021/acsami.1c08758
ACS applied materials & interfaces, Vol. 13, Num. 38 (September 2021) , p. 45679-45685
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3.
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13 p, 643.2 KB |
Piezoelectricity in nominally centrosymmetric phases
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Aktas, Oktay (Xi'an Jiaotong University. State Key Laboratory for Mechanical Behavior of Materials, Materials Science and Engineering) ;
Kangama, Moussa (Xi'an Jiaotong University. State Key Laboratory for Mechanical Behavior of Materials, Materials Science and Engineering) ;
Linyu, Gan (Xi'an Jiaotong University. State Key Laboratory for Mechanical Behavior of Materials, Materials Science and Engineering) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia) ;
Ding, Xiangdong (Xi'an Jiaotong University. State Key Laboratory for Mechanical Behavior of Materials, Materials Science and Engineering) ;
Zunger, Alex (University of Colorado. Energy Institute) ;
Salje, Ekhard K. H. (University of Cambridge. Department of Earth Sciences)
Compound phases often display properties that are symmetry forbidden relative to their nominal, average crystallographic symmetry, even if extrinsic reasons (defects, strain, or imperfections) are not apparent. [...]
2021 - 10.1103/PhysRevResearch.3.043221
Physical Review Research, Vol. 3, issue 4 (Dec. 2021) , art. 43221
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11 p, 2.6 MB |
Strong strain gradients and phase coexistence at the metal-insulator transition in VO2 epitaxial films
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Rodríguez Domínguez, Laura (Institut Català de Nanociència i Nanotecnologia) ;
Sandiumenge Ortiz, Felip (Institut de Ciència de Materials de Barcelona) ;
Frontera, Carlos (Institut de Ciència de Materials de Barcelona) ;
Caicedo Roque, Jose Manuel (Institut Català de Nanociència i Nanotecnologia) ;
Padilla-Pantoja, Jessica (Institut Català de Nanociència i Nanotecnologia) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia) ;
Santiso, José (Institut Català de Nanociència i Nanotecnologia)
The proximity of a thermodynamic triple point and the formation of transient metastable phases may result in complex phase and microstructural trajectories across the metal-insulator transition in strained VO films. [...]
2021 - 10.1016/j.actamat.2021.117336
Acta Materialia, Vol. 220 (Nov. 2021) , art. 117336
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9 p, 2.4 MB |
Effect of humidity on the writing speed and domain wall dynamics of ferroelectric domains
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Spasojevic, Irena (Universitat Autònoma de Barcelona. Departament de Química) ;
Verdaguer Prats, Albert (Institut de Ciència de Materials de Barcelona) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia) ;
Domingo Marimon, Neus (Institut Català de Nanociència i Nanotecnologia)
The switching dynamics of ferroelectric polarization under electric fields depends on the availability of screening charges in order to stabilize the switched polarization. In ferroelectrics, thin films with exposed surfaces investigated by piezoresponse force microscopy (PFM), the main source of external screening charges is the atmosphere and the water neck, and therefore relative humidity (RH) plays a major role. [...]
2022 - 10.1002/aelm.202100650
Advanced Electronic Materials, Vol. 8, issue 6 (June 2022) , art. 2100650
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7.
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36 p, 1.5 MB |
Metallic diluted dimerization in VO2 tweeds
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Sandiumenge Ortiz, Felip (Institut de Ciència de Materials de Barcelona) ;
Rodríguez Domínguez, Laura (Institut Català de Nanociència i Nanotecnologia) ;
Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia) ;
Magen Dominguez, Cesar (Instituto de Nanociencia de Aragón) ;
Santiso, José (Institut Català de Nanociència i Nanotecnologia) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
The observation of electronic phase separation textures in vanadium dioxide, a prototypical electron-correlated oxide, has recently added new perspectives on the long standing debate about its metal-insulator transition and its applications. [...]
2021 - 10.1002/adma.202004374
Advanced materials, Vol. 33, issue 9 (March 2021) , art. 2004374
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8.
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30 p, 3.1 MB |
Origin of large negative electrocaloric effect in antiferroelectric PbZr O3
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Vales Castro, Pablo (Institut Català de Nanociència i Nanotecnologia) ;
Faye, Romain (Luxembourg Institute of Science and Technology. Materials Research and Technology Department) ;
Vellvehi, Miquel (Institut de Microelectrònica de Barcelona) ;
Nouchokgwe, Youri (University of Luxembourg) ;
Perpiñà Giribet, Xavier (Institut de Microelectrònica de Barcelona) ;
Caicedo Roque, Jose Manuel (Institut Català de Nanociència i Nanotecnologia) ;
Jordà, Xavier (Institut de Microelectrònica de Barcelona) ;
Roleder, Krystian (University of Silesia in Katowice. Institute of Physics) ;
Kajewski, Dariusz (University of Silesia in Katowice. Institute of Physics) ;
Perez-Tomas, Amador (Institut Català de Nanociència i Nanotecnologia) ;
Defay, Emmanuel (Luxembourg Institute of Science and Technology. Materials Research and Technology Department) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
We have studied the electrocaloric response of the archetypal antiferroelectric PbZrO3 as a function of voltage and temperature in the vicinity of its antiferroelectric-paraelectric phase transition. [...]
2021 - 10.1103/PhysRevB.103.054112
Physical review B, Vol. 103 Núm. 5 (Feb. 2021) , art. 54112
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12 p, 510.0 KB |
A flexoelectric microelectromechanical system on silicon
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Bhaskar, Umesh K. (Institut Català de Nanociència i Nanotecnologia) ;
Banerjee, Nirupam (University of Twente. Faculty of Science and Technology) ;
Abdollahi, Amir (Institut Català de Nanociència i Nanotecnologia) ;
Wang, Zhe (Cornell University. Department of Materials Science and Engineering) ;
Schlom, Darrell G. (Cornell University. Department of Materials Science and Engineering) ;
Rijnders, Guus (University of Twente. Faculty of Science and Technology) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
Flexoelectricity allows a dielectric material to polarize in response to a mechanical bending moment and, conversely, to bend in response to an electric field. Compared with piezoelectricity, flexoelectricity is a weak effect of little practical significance in bulk materials. [...]
2016 - 10.1038/nnano.2015.260
Nature Nanotechnology, Vol. 11, issue 3 (March 2016) , p. 263-266
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28 p, 1.8 MB |
Self-pixelation through fracture in VO2 thin films
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Rodríguez Domínguez, Laura (Institut Català de Nanociència i Nanotecnologia) ;
Del Corro, Elena (Institut Català de Nanociència i Nanotecnologia) ;
Conroy, Michele (University of Limerick. Department of Physics) ;
Moore, Kalani (University of Limerick. Department of Physics) ;
Sandiumenge Ortiz, Felip (Institut de Ciència de Materials de Barcelona) ;
Domingo Marimon, Neus (Institut de Ciència de Materials de Barcelona) ;
Santiso, José (Institut Català de Nanociència i Nanotecnologia) ;
Catalan, Gustau (Institut Català de Nanociència i Nanotecnologia)
Vanadium dioxide (VO2) is an archetypal Mott material with a metal-insulator transition (MIT) at near room temperature. In thin films, this transition is affected by substrate-induced strain but as film thickness increases, the strain is gradually relaxed and the bulk properties are recovered. [...]
2020 - 10.1021/acsaelm.0c00199
ACS applied electronic materials, Vol. 2, issue 5 (May 2020) , p. 1433-1439
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