Copper K-edge x-ray absorption data indicate that an axial oxygen-centered lattice instability accompanying the 93 K superconducting transition in YBa(2)Cu(3)O(7) is of a pseudo-(anti)ferroelectric type, in that it appears to involve the softening of a double potential well into a structure in which the difference between the two copper-oxygen distances and the barrier height have both decreased. This softer structure is present only at temperatures within a fluctuation region around the transition. A similar process involving the analogous axial oxygen atom also accompanies the superconducting transition in T1Ba(2)Ca(3)Cu(4)O(11), where the superconducting transition temperature T(c) is ~120 K. The mean square relative displacement of this oxygen atom in YBa(2)Cu(3)O(7) is also specifically affected by a reduction in the oxygen content and by the substitution of cobalt for copper, providing further evidence for the sensitivity of the displacement to additional factors that also influence the superconductivity. On the basis of the implied coupling of this ionic motion to the superconductivity, a scenario for high-temperature superconductivity is presented in which both phonon and electronic (charge transfer) channels are synergistically involved.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1126/science.248.4961.1394 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Local-structure insight into the improved superconducting properties of Pb-substituted La(O, F)BiS: a photoelectron holography study.
Sci Rep
March 2025
Graduate School of Natural Science and Technology, Okayama University, Okayama, 700-8530, Japan.
Pb-substituted La(O, F)BiS (Pb-LaOFBiS) exhibits improved superconducting properties and a resistivity anomaly around 100 K that is attributed to a structural transition. We have performed temperature(T)-dependent photoelectron holography (PEH) to study dopant incorporation sites and the local structure change across the anomaly. The PEH study of Pb-LaOFBiS provided evidence for the dominant incorporation sites of Pb and F: Pb atoms are incorporated into the Bi sites and F atoms are incorporated into the O site.
View Article and Find Full Text PDFAtomic-Scale Mapping of Superconductivity in the Incoherent CDW Mosaic Phase of a Transition Metal Dichalcogenide.
Nano Lett
March 2025
Donostia International Physics Center, Paseo Manuel de Lardizábal 4, 20018 San Sebastián, Spain.
The emergence of superconductivity in the octahedrally coordinated (1T) phase of TaS is preceded by the loss of long-range order in the charge density wave (CDW). Such decoherence triggers the formation of nm-sized coherent CDW domains bound by a domain wall network, known as the mosaic phase, and proposed as the spatial origin of superconductivity. Here, we report the atomic-scale characterization of superconductivity in 1T-TaSSe, a model 1T compound exhibiting the CDW mosaic phase, using high-resolution scanning tunneling spectroscopy and Andreev spectroscopy.
View Article and Find Full Text PDFTunable superconductivity coexisting with the anomalous Hall effect in a transition metal dichalcogenide.
Nat Commun
March 2025
Laboratory for Topological Quantum Matter and Advanced Spectroscopy, Department of Physics, Princeton University, Princeton, NJ, USA.
Transition metal dichalcogenides display a high technological potential due to their wide range of electronic ground states. Here, we unveil that by tuning hydrostatic pressure P, a cascade of electronic phase transitions can be induced in the few-layer transition metal dichalcogenide 1T'-WS. As P increases, we observe the suppression of superconductivity with the concomitant emergence of an anomalous Hall effect (AHE) at GPa.
View Article and Find Full Text PDFObservation of first- and second-order dissipative phase transitions in a two-photon driven Kerr resonator.
Nat Commun
March 2025
Hybrid Quantum Circuit Laboratory (HQC), Institute of Physics, École Polytéchnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
In open quantum systems, dissipative phase transitions (DPTs) emerge from the interplay between unitary evolution, drive, and dissipation. While second-order DPTs have been predominantly investigated theoretically, first-order DPTs have been observed in single-photon-driven Kerr resonators. We present here an experimental and theoretical analysis of both first and second-order DPTs in a two-photon-driven superconducting Kerr resonator.
View Article and Find Full Text PDFAtomic scale determination of magnetism and stoichiometry at the LaSrMnO/SrTiO interface: investigation of inverse hysteresis.
NPG Asia Mater
March 2025
Department Dynamics and Transport in Quantum Materials, Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany.
Controlling the correlations and electronic reconstruction at the interface of transition metal oxide heterostructures provides a new pathway for tuning their unique physical properties. Here, we investigate the effects of interfacial nonstoichiometry and vertical phase separation on the magnetic properties and proximity-induced magnetism of epitaxial LaSrMnO (LSMO)/SrTiO(001) oxide heterostructures. We also reinvestigate the recently observed inverse hysteresis behavior reported for this system, which we find emanates from the remanent field of the superconducting solenoid and not from antiferromagnetic intra-layer exchange coupling in low coercivity LSMO thin films.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!