Publications by authors named "F Caglieris"
Article Synopsis
- Researchers are investigating materials that exhibit multiple symmetry breaking, which enables the formation of unique four-fermion states above superconducting critical temperatures.
- A recent study on BaKFeAs revealed a fermionic quadrupling condensate that disrupts Z time-reversal symmetry, highlighted by two specific heat anomalies.
- These anomalies indicate significant phase transitions: one shows a spontaneous Nernst effect at a higher temperature, while the other correlates with the transition to a superconducting zero-resistance state at a lower temperature.
Article Synopsis
- The binary compound CuAs was re-investigated for its formation and crystal structure, confirming it crystallizes in a hexagonal form at room temperature, differing from previous reports.
- It melts congruently at 835 °C and exhibits a slight understoichiometry in one atomic site, leading to the refined composition CuAs.
- A first-order structural transition to a lower-temperature trigonal form occurs at 243 K, which is characterized by a unique copper sublattice and further structural changes at lower temperatures, detected through differential scanning calorimetry.
Symmetry breaking in topological matter has become in recent years a key concept in condensed matter physics to unveil novel electronic states. In this work, we predict that broken inversion symmetry and strong spin-orbit coupling in trigonal PtBi lead to a type-I Weyl semimetal band structure. Transport measurements show an unusually robust low dimensional superconductivity in thin exfoliated flakes up to 126 nm in thickness (with ∼ 275-400 mK), which constitutes the first report and study of unambiguous superconductivity in a type-I Weyl semimetal.
View Article and Find Full Text PDFWe investigate the charge and thermoelectric transport in modulation-doped large-area rubrene thin-film crystals with different crystal phases. We show that modulation doping allows achieving superior doping efficiencies even for high doping densities, when conventional bulk doping runs into the reserve regime. Modulation-doped orthorhombic rubrene achieves much improved thermoelectric power factors, exceeding 20 μW m K at 80°C.
View Article and Find Full Text PDFWe report a systematic elastoresistivity study on LaFe_{1-x}Co_{x}AsO single crystals, which have well separated structural and magnetic transition lines. All crystals show a Curie-Weiss-like nematic susceptibility in the tetragonal phase. The extracted nematic temperature is monotonically suppressed upon cobalt doping, and changes sign around the optimal doping level, indicating a possible nematic quantum critical point beneath the superconducting dome.
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