Phys.org August 15, 2024 Copper oxide materials can be made superconducting by doping the parent compound with either electrons or holes. Hole-doped cuprates typically have higher transition temperatures and have been studied more extensively. An international team of researchers (SLAC National Accelerator Laboratory, Yale University, UC Berkeley, Sweden) observed an unusual energy gap in electron-doped cuprate Nd2-xCexCuO4 high above the temperature of the superconducting transition. After considering all the known ordering tendencies in tandem with the phase diagram, they hypothesized that the normal-state gap in the underdoped n-type cuprates originated from Cooper pairing. According to the researchers the high temperature […]
Tag Archives: Ferromagnetism
Researchers discover new material for optically-controlled magnetic memory
Phys.org August 9, 2024 The indirect exchange interaction between local magnetic moments via surface electrons has been long predicted to bolster the surface ferromagnetism in magnetic topological insulators (MTIs), which facilitates the quantum anomalous Hall effect. This unconventional effect is critical to determining the operating temperatures of future topotronic devices. However, the experimental confirmation of this mechanism has not been investigated in intrinsic MTIs. An international team of researchers (University of Chicago, University of Florida, Pennsylvania State University, Israel) combined time-resolved photoemission spectroscopy with time-resolved magneto-optical Kerr effect measurements to explain the unique electromagnetism at the surface of an intrinsic […]
The spontaneous emergence of 1D superconducting stripes at a 2D interface in an oxide heterostructure
Phys.org April 8, 2024 Magnetism can cause a modulation of superconducting pairing in real space in both copper-based and iron-based materials. Researchers in China reported on the discovery of a spatially varying superconducting state residing at the interface between KTaO3 and ferromagnetic EuO. Electrical transport measurements revealed different values of the critical temperature and magnetic field at which the superconductivity breaks down when current was applied along the two orthogonal in-plane directions. This anisotropy occurred in low-carrier-density samples that were characterized by strong coupling between the Ta 5d and Eu 4f electrons, whereas in high-carrier-density samples, the coupling was weakened, […]
Itinerant magnetism and superconductivity in exotic 2D metals for next-generation quantum devices
Phys.org October 23, 2023 Metallic ferromagnets with strongly interacting electrons often exhibit remarkable electronic phases such as ferromagnetic superconductivity, complex spin textures, and nontrivial topology. A team of researchers in the US (UC Berkeley, Los Alamos National Laboratory) conducted a series of experiments with a new type of layered 2D metal, finding connections in electronic behavior that might potentially be useful for fabricating complex superconducting quantum processors. They discussed the synthesis of a layered magnetic metal NiTa4Se8 (or Ni1/4TaSe2) with a Curie temperature of 58 Kelvin. Magnetization data and density functional theory calculations indicated that the nickel atoms host uniaxial […]
Lasers trigger magnetism in atomically thin quantum materials
Science Daily April 20, 2022 Recently two-dimensional moiré superlattices have emerged as a promising platform for quantum engineering. The power of the moiré system lies in the high tunability of its physical parameters by adjusting the layer twist angle, electrical field, moiré carrier filling and interlayer coupling. An international team of researchers (USA – University of Washington, Oak Ridge National Laboratory, Pacific Northwest National Laboratory, Hong Kong, Japan) found that optical excitation can highly tune the spin–spin interactions between moiré-trapped carriers, resulting in ferromagnetic order in WS2 /WSe2 moiré superlattices. Near the filling factor of −1/3, as the excitation power […]
Scientists discover new magnetic element
Phys.org May 24, s018 A team of researchers in the US (University of Minnesota, University of Wisconsin, industry) has demonstrated single element ferromagnetism in ruthenium. They observed a saturation magnetization of 148 and 160 emu cm−3 at room temperature and 10 K, respectively. Increasing thickness results in strain relaxation, and thus diluting the magnetization. Anomalous Hall measurements are used to confirm its ferromagnetic behavior. The discovery could be used to improve sensors, devices in the computer memory and logic industry, or other devices using magnetic materials… read more. Open Access TECHNICAL ARTICLE