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Showing 1–12 of 12 results
Advanced filters: Author: M. Janoschek Clear advanced filters

  • Kondo materials exhibit extremely rich physics, from unconventional superconductivity to topological phases. Unfortunately, for a real material, direct solution of the Kondo lattice is practically impossible. Here, Simeth et al. present a tractable approach to this problem, showing how a multi-orbital periodic Anderson model can be reduced to a Kondo lattice model, and be applied to relevant materials and quantitatively validated with neutron spectroscopy.

    • W. Simeth
    • Z. Wang
    • M. Janoschek
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-10

  • The fate of high-energy degrees of freedom, such as spin-orbit interactions, in the coherent state of Kondo lattice materials remains unclear. Here, the authors use resonant inelastic x-ray scattering in CePd3 to show how Kondo-quasiparticle excitations are renormalized and develop a pronounced momentum dependence, while maintaining a largely unchanged spin-orbit gap.

    • M. C. Rahn
    • K. Kummer
    • M. Janoschek
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-8

  • Surface-sensitive scanning tunneling microscopy (STM) has previously found a charge density wave (CDW) up to 10 K in the normal state of the heavy-fermion superconductor UTe2. Here, using resonant elastic X-ray scattering (REXS) above the superconducting transition, the authors find no evidence for a bulk CDW, suggesting the normal state CDW observed by STM is a surface effect.

    • C. S. Kengle
    • J. Vonka
    • W. Simeth
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-7

  • Unconventional superconductivity in the cuprates involves a complex interplay of competing charge and spin orders, making it challenging to elucidate the underlying mechanisms. Here, the authors apply uniaxial pressure to tune LBCO, and using muon spin rotation and AC susceptibility, reveal a gradual suppression of Tc under c-axis stress–contrasting with its strong enhancement under in plane stress–and show that c axis compression leaves spin stripe order intact while in plane stress strongly suppresses it.

    • Shams Sohel Islam
    • Vahid Sazgari
    • Zurab Guguchia
    ResearchOpen Access
    Communications Physics
    Volume: 8, P: 1-8

  • Transverse stripe order fluctuations may promote superconductivity, but experimental verifications remain difficult. Here, the authors report that a mild uniaxial pressure changes the ordering pattern and pins the stripe order to the crystal axis in La1.88Sr0.12CuO4.

    • Qisi Wang
    • K. von Arx
    • J. Chang
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-6

  • Magnetic skyrmions are nanosized and topologically-protected objects that exhibit well-controlled motion under applied current making them prime candidates for race-track memories. The author’s study skyrmion lattice creep that is detrimental for memory applications using ultrasound spectroscopy.

    • Yongkang Luo
    • Shi-Zeng Lin
    • Boris Maiorov
    ResearchOpen Access
    Communications Materials
    Volume: 1, P: 1-7

  • By means of a sensitive neutron spectroscopy approach the magnetic excitations in the heavy fermion superconductor CeRhIn5 are probed, revealing a uniaxial anisotropy that can be tuned with an external magnetic field.

    • D. M. Fobes
    • S. Zhang
    • M. Janoschek
    Research
    Nature Physics
    Volume: 14, P: 456-460

  • The non-Fermi-liquid regime that emerges in MnSi under high pressures displays a Hall signal that can be traced to topologically non-trivial spin configurations at low pressures — a well-understood skyrmion lattice — empirically suggesting a route towards a breakdown of Fermi liquid theory in pure metals.

    • R. Ritz
    • M. Halder
    • C. Pfleiderer
    Research
    Nature
    Volume: 497, P: 231-234

  • Tuning superconductivity and its interplay with other phases in cuprates yields insights into the underlying physics of this material class. Here, the authors performed a hard x-ray diffraction experiment on La1.88Sr0.12CuO4 showing that uniaxial pressure along the c-axis acts as a direct tuning parameter of the competition between superconductivity and charge order.

    • J. Küspert
    • I. Biało
    • J. Chang
    ResearchOpen Access
    Communications Physics
    Volume: 7, P: 1-6