Maria N. Gastiasoro
YOU?
Author Swipe
View article: Gapless superconductivity from extremely dilute magnetic disorder in 2H-NbSe2-xSx
Gapless superconductivity from extremely dilute magnetic disorder in 2H-NbSe2-xSx Open
Most superconducting materials exhibit a vanishing density of states at the Fermi level and Anderson's theorem posits that the superconducting gap is robust against nonmagnetic disorder. Although dilute magnetic impurities lead to localize…
View article: Strong coupling theory of superconductivity and ferroelectric quantum criticality in metallic SrTiO3
Strong coupling theory of superconductivity and ferroelectric quantum criticality in metallic SrTiO3 Open
Superconductivity in doped SrTiO3 has remained an enduring mystery for over 50 years. The material’s status as a “quantum" ferroelectric metal, characterized by a soft polar mode, suggests that quantum criticality could play a pivotal role…
View article: Layer-selective Cooper pairing in an alternately stacked transition metal dichalcogenide
Layer-selective Cooper pairing in an alternately stacked transition metal dichalcogenide Open
Multigap superconductivity emerges when superconducting gaps form on distinct Fermi surfaces. Arising from locally overlapping atomic orbitals, multiple superconducting bands introduce a new internal degree of freedom in the material that,…
View article: Electronic spin susceptibility in metallic strontium titanate
Electronic spin susceptibility in metallic strontium titanate Open
Metallic strontium titanate (SrTiO3) is known to have both normal-state and superconducting properties that strongly vary over a wide range of charge carrier densities, but the complex interplay between lattice and electronic degrees of fr…
View article: Strong Coupling Theory of Superconductivity and Ferroelectric Quantum Criticality in metallic SrTiO$_3$
Strong Coupling Theory of Superconductivity and Ferroelectric Quantum Criticality in metallic SrTiO$_3$ Open
Superconductivity in doped SrTiO$_3$ has remained an enduring mystery for over 50 years. The material's status as a ``quantum" ferroelectric metal, characterized by a soft polar mode, suggests that quantum criticality could play a pivotal …
View article: Ising domain wall networks from intertwined charge density waves in single-layer TiSe2
Ising domain wall networks from intertwined charge density waves in single-layer TiSe2 Open
When the period of an incommensurate charge density wave (ICDW) approaches an integer multiple of a lattice vector, the energy gain obtained from locking the period to the lattice can lead to a fascinating transition into a commensurate st…
View article: Electronic spin susceptibility in metallic strontium titanate
Electronic spin susceptibility in metallic strontium titanate Open
Metallic strontium titanate (SrTiO$_3$) is known to have both normal-state and superconducting properties that vary strongly over a wide range of charge carrier densities. This indicates the importance of nonlinear dynamics, and has hinder…
View article: Generalized Rashba electron-phonon coupling and superconductivity in strontium titanate
Generalized Rashba electron-phonon coupling and superconductivity in strontium titanate Open
SrTiO_{3} is known for its proximity to a ferroelectric phase and for showing an “optimal” doping for superconductivity with a characteristic domelike behavior resembling systems close to a quantum critical point. Several mechanisms have b…
View article: Enhanced Critical Field of Superconductivity at an Oxide Interface
Enhanced Critical Field of Superconductivity at an Oxide Interface Open
The nature of superconductivity and its interplay with strong spin-orbit coupling at the KTaO3(111) interfaces remains a subject of debate. To address this problem, we grew epitaxial LaMnO3/KTaO3(111) heterostructures. We show that superco…
View article: Anisotropic Rashba coupling to polar modes in KTaO<sub>3</sub>
Anisotropic Rashba coupling to polar modes in KTaO<sub>3</sub> Open
Motivated by the discovery of superconductivity in KTaO 3 -based heterostructures, we study a pairing mechanism based on spin-orbit assisted coupling between the conduction electrons and the ferroelectric (FE) modes present in the material…
View article: Anisotropic Rashba coupling to polar modes in KTaO3
Anisotropic Rashba coupling to polar modes in KTaO3 Open
Motivated by the discovery of superconductivity in KTaO3-based heterostructures, we study a pairing mechanism based on spin-orbit assisted coupling between the conduction electrons and the ferroelectric modes present in the material. We us…
View article: Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate
Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate Open
SrTiO3 is known for its proximity to a ferroelectric phase and for showing an 'optimal' doping for superconductivity with a characteristic dome-like behaviour resembling systems close to a quantum critical point. Several mechanisms have be…
View article: Data for article "Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics"
Data for article "Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics" Open
Ab initio frozen-phonon splitting of the electronic bands, normalized with the polar displacement. The data is plotted in figure 3 (b) of the article Phys. Rev. B 105, 224503 (2022).
View article: Data for article "Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics"
Data for article "Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics" Open
Ab initio frozen-phonon splitting of the electronic bands, normalized with the polar displacement. The data is plotted in figure 3 (b) of the article Phys. Rev. B 105, 224503 (2022).
View article: Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics
Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics Open
Experimental evidence suggests that superconductivity in SrTiO$_3$ is\nmediated by a soft transverse ferroelectric mode which, according to\nconventional theories, has negligible coupling with electrons. A\nphenomenological Rashba type cou…
View article: Anomalous transport in high-mobility superconducting SrTiO <sub>3</sub> thin films
Anomalous transport in high-mobility superconducting SrTiO <sub>3</sub> thin films Open
The study of subtle effects on transport in semiconductors requires high-quality epitaxial structures with low defect density. Using hybrid molecular beam epitaxy (MBE), SrTiO 3 films with a low-temperature mobility exceeding 42,000 cm 2 V…
View article: Strength of Correlations in a Silver Based Cuprate Analogue
Strength of Correlations in a Silver Based Cuprate Analogue Open
AgF2 has been proposed as a cuprate analogue which requires strong correlation and marked covalence. On the other hand, fluorides are usually quite ionic and 4d transition metals tend to be less correlated than their 3d counterparts, which…
View article: Charge doping to flat AgF2 monolayers in a chemical capacitor setup
Charge doping to flat AgF2 monolayers in a chemical capacitor setup Open
Flat monolayers of silver II fluoride, which could be obtained by epitaxial deposition on an appropriate substrate, have been recently predicted to exhibit very strong antiferromagnetic superexchange and to have large potential for ambient…
View article: Theory of Rashba coupling mediated superconductivity in incipient ferroelectrics
Theory of Rashba coupling mediated superconductivity in incipient ferroelectrics Open
Experimental evidence suggest that superconductivity in SrTiO$_3$ is mediated by a soft transverse ferroelectric mode which, according to conventional theories, has negligible coupling with electrons. A phenomenological Rashba type couplin…
View article: Anomalous Transport in High-Mobility Superconducting SrTiO$_3$ Thin Films
Anomalous Transport in High-Mobility Superconducting SrTiO$_3$ Thin Films Open
The study of subtle effects on transport in semiconductors requires high-quality epitaxial structures with low defect density. Using hybrid molecular beam epitaxy (MBE), SrTiO$_3$ films with low-temperature mobility exceeding 42,000 cm$^2$…
View article: Anisotropic superconductivity mediated by ferroelectric fluctuations in cubic systems with spin-orbit coupling
Anisotropic superconductivity mediated by ferroelectric fluctuations in cubic systems with spin-orbit coupling Open
Motivated by the experimental observation that superconductivity in bulk\ndoped SrTiO$_{3}$ is enhanced as a putative ferroelectric quantum critical\npoint (FE-QCP) is approached, we study the pairing instability of a cubic\nsystem in whic…
View article: Phonon-mediated superconductivity in low carrier-density systems
Phonon-mediated superconductivity in low carrier-density systems Open
Motivated by the observation of superconductivity in SrTiO3 and Bi, we analyze phonon-mediated superconductivity in three-dimensional systems at low carrier density, when the chemical potential μ is comparable to or even smaller than the c…
View article: Enhancing superconductivity by disorder
Enhancing superconductivity by disorder Open
We study two mechanisms for enhancing the superconducting transition\ntemperature Tc by nonmagnetic disorder in both conventional (sign-preserving\ngaps) and unconventional (sign-changing gaps) superconductors (SC). In the\nfirst scenario,…
View article: Normal and Superconducting state of doped Strontium Titanate
Normal and Superconducting state of doped Strontium Titanate Open
SrTiO is one of the most extensively studied perovskite oxides. Charge transport in the normal state
\nand the origin of superconductivity are however still a source of debate in this material.
\nIn the first part of the talk, we present a…
View article: Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors Open
75As nuclear magnetic (NMR) and quadrupolar (NQR) resonance were used, together with Mössbauer
\nspectroscopy, to investigate the magnetic state induced by Mn for Fe substitutions in F-doped LaFe1−xMnxAsO
\nsuperconductors. The results sho…
View article: Role of magnetic dopants in the phase diagram of Sm 1111 pnictides: The case of Mn
Role of magnetic dopants in the phase diagram of Sm 1111 pnictides: The case of Mn Open
The deliberate insertion of magnetic Mn dopants in the Fe sites of the optimally doped SmFeAsO0.88F0.12 iron-based superconductor can modify in a controlled way its electronic properties. The resulting phase diagram was investigated across…
View article: Unconventional Disorder Effects in Correlated Superconductors
Unconventional Disorder Effects in Correlated Superconductors Open
We study the effects of disorder on unconventional superconductors in the presence of correlations, and explore a novel correlated disorder paradigm dominated by strong deviations from standard Abrikosov-Gor'kov theory due to generation of…
View article: Publisher’s Note: Effects of Lifshitz Transitions on Charge Transport in Magnetic Phases of Fe-Based Superconductors [Phys. Rev. Lett. <b>114</b>, 097003 (2015)]
Publisher’s Note: Effects of Lifshitz Transitions on Charge Transport in Magnetic Phases of Fe-Based Superconductors [Phys. Rev. Lett. <b>114</b>, 097003 (2015)] Open
This corrects the article DOI: 10.1103/PhysRevLett.114.097003.
View article: Scanning tunneling spectroscopy as a probe of multi-Q magnetic states of itinerant magnets
Scanning tunneling spectroscopy as a probe of multi-Q magnetic states of itinerant magnets Open
The combination of electronic correlations and Fermi surfaces with multiple nesting vectors can lead to the appearance of complex multi-Q magnetic ground states, hosting unusual states such as chiral density-waves and quantum Hall insulato…