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Articles by M. Hepting
Evolution of plasmon excitations across the phase diagram of the cuprate superconductor ${\mathrm{La}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$
Abstract We use resonant inelastic x-ray scattering (RIXS) at the O K- and Cu K-edges to investigate the doping dependence and temperature dependence of low-energy plasmon excitations in La2−xSrxCuO4.
Author Correction: Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate
Author Correction: Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate W. S. Lee ORCID: orcid.org/0000-0001-7677-04211, Ke-Jin Zhou ORCID: orcid.org/0000-0001-9293-05952, M. Hepting ORCID: orcid.org/0000-0002-5824-89011, J. Li2, A. Nag2, A. C. Walters2, M. Garcia-Fernandez2, H. C. Robarts2, M. Hashimoto3, H. Lu4, B. Nosarzewski4, D. Song5, H. Eisaki5, Z. X. Shen ORCID: orcid.org/0000-0002-1454-02811,6, B. Moritz ORCID: orcid.org/0000-0002-3747-84841, J. Zaanen7 & T. P.
Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate
Abstract Copper oxide high-TC superconductors possess a number of exotic orders that coexist with or are proximal to superconductivity. Quantum fluctuations associated with these orders may account for the unusual characteristics of the normal state, and possibly affect the superconductivity1,2,3,4. Yet, spectroscopic evidence for such quantum fluctuations remains elusive.
Publisher Correction: Electronic structure of the parent compound of superconducting infinite-layer nickelates
Correction to: Nature Materials https://doi.org/10.1038/s41563-019-0585-z, published online 20 January 2020.
Electronic structure of the parent compound of superconducting infinite-layer nickelates
Abstract The search continues for nickel oxide-based materials with electronic properties similar to cuprate high-temperature superconductors1,2,3,4,5,6,7,8,9,10. The recent discovery of superconductivity in the doped infinite-layer nickelate NdNiO2 (refs. 11,12) has strengthened these efforts. Here, we use X-ray spectroscopy and density functional theory to show that the electronic structure of LaNiO2 and NdNiO2, while similar to the cuprates, includes significant distinctions.
Three-dimensional collective charge excitations in electron-doped copper oxide superconductors
High-temperature copper oxide superconductors consist of stacked CuO planes, with electronic band structures and magnetic excitations that are primarily two-dimensional1,2, but with superconducting coherence that is three-dimensional. This dichotomy highlights the importance of out-of-plane charge dynamics, which has been found to be incoherent in the normal state3,4 within the limited range of momenta accessible by optics.
Complex magnetic order in nickelate slabs
Recent progress in the synthesis of epitaxial heterostructures and thin films has opened new opportunities for designing and manipulating correlated-electron systems. Rare-earth nickel oxides RNiO with pseudocubic perovskite structure are a prominent example. In bulk form, RNiO with R ≠ La show temperature-driven metal–insulator (T ) and Néel (T ) transitions with T ≥ T (ref. 8).
Coexisting first- and second-order electronic phase transitions in a correlated oxide
Abstract The explanation and control of phase transitions remain cornerstones of contemporary physics. Landau provided an invaluable insight into the thermodynamics of complex systems by formulating their phase transitions in terms of an order parameter. Within this formulation, continuous evolution of the order parameter away from zero classifies the phase transition as second-order, whereas a discontinuous change signals a first-order transition.
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