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Anomalous normal-state gap in an electron-doped cuprate.
Science
August 2024
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
In the underdoped n-type cuprate NdCeCuO, long-range antiferromagnetic order reconstructs the Fermi surface, resulting in a putative antiferromagnetic metal with small Fermi pockets. Using angle-resolved photoemission spectroscopy, we observe an anomalous energy gap, an order of magnitude smaller than the antiferromagnetic gap, in a wide portion of the underdoped regime and smoothly connecting to the superconducting gap at optimal doping. After considering all the known ordering tendencies in tandem with the phase diagram, we hypothesize that the normal-state gap in the underdoped n-type cuprates originates from Cooper pairing.
View Article and Find Full Text PDFStrain-induced long-range charge-density wave order in the optimally doped BiSrLaCuO superconductor.
Nat Commun
June 2024
Department of Physics, Okayama University, Okayama, Japan.
The mechanism of high-temperature superconductivity in copper oxides (cuprate) remains elusive, with the pseudogap phase considered a potential factor. Recent attention has focused on a long-range symmetry-broken charge-density wave (CDW) order in the underdoped regime, induced by strong magnetic fields. Here by Cu-nuclear magnetic resonance, we report the discovery of a long-range CDW order in the optimally doped BiSrLaCuO superconductor, induced by in-plane strain exceeding ∣ε∣ = 0.
View Article and Find Full Text PDFDynamical interplay between superconductivity and pseudogap in cuprates as revealed by terahertz third-harmonic generation spectroscopy.
Sci Adv
February 2024
International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China.
Article Synopsis
- The research focuses on nonlinear terahertz third-harmonic generation (THG) in YBaCuO thin films, revealing that the THG signal appears even in the normal state, contrasting with traditional superconductors.
- The THG signal displays an anomaly just below the optimal doping temperature, and a unique beat pattern is observed in the real-time waveform of the THG signal.
- The study suggests that the Higgs mode, which emerges at lower temperatures, influences energy level splitting via a coupling mechanism, although this effect is less noticeable in underdoped samples, providing insights into superconductivity and the pseudogap phenomenon.
Linear-in-temperature resistivity for optimally superconducting (Nd,Sr)NiO.
Nature
July 2023
Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
The occurrence of superconductivity in proximity to various strongly correlated phases of matter has drawn extensive focus on their normal state properties, to develop an understanding of the state from which superconductivity emerges. The recent finding of superconductivity in layered nickelates raises similar interests. However, transport measurements of doped infinite-layer nickelate thin films have been hampered by materials limitations of these metastable compounds: in particular, a high density of extended defects.
View Article and Find Full Text PDFTracking the nematicity in cuprate superconductors: a resistivity study under uniaxial pressure.
J Phys Condens Matter
June 2022
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
Overshadowing the superconducting dome in hole-doped cuprates, the pseudogap state is still one of the mysteries that no consensus can be achieved. It has been suggested that the rotational symmetry is broken in this state and may result in a nematic phase transition, whose temperature seems to coincide with the onset temperature of the pseudogap stateT∗around optimal doping level, raising the question whether the pseudogap results from the establishment of the nematic order. Here we report results of resistivity measurements under uniaxial pressure on several hole-doped cuprates, where the normalized slope of the elastoresistivitycan be obtained as illustrated in iron-based superconductors.
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