no code implementations • 11 Mar 2021 • Stephan Allenspach, Pascal Puphal, Joosep Link, Ivo Heinmaa, Ekaterina Pomjakushina, Cornelius Krellner, Jakob Lass, Gregory S. Tucker, Christof Niedermayer, Shusaku Imajo, Yoshimitsu Kohama, Koichi Kindo, Steffen Krämer, Mladen Horvatić, Marcelo Jaime, Alexander Madsen, Antonietta Mira, Nicolas Laflorencie, Frédéric Mila, Bruce Normand, Christian Rüegg, Raivo Stern, Franziska Weickert
Classical and quantum phase transitions (QPTs), with their accompanying concepts of criticality and universality, are a cornerstone of statistical thermodynamics.
Strongly Correlated Electrons
no code implementations • 13 Jan 2021 • Sumit Ranjan Maity, Monica Ceretti, Lukas Keller, Jürg Schefer, Tian Shang, Ekaterina Pomjakushina, Martin Meven, Denis Sheptyakov, Antonio Cervellino, Werner Paulus
Macroscopic magnetization measurements and neutron powder diffraction studies reveal long-range antiferromagnetic ordering of the Ni-sublattice at TN ~ 53 K with a weak ferromagnetic component along the c-axis, while the long-range magnetic ordering of the Nd-sublattice occurs below 10 K. Temperature dependent neutron diffraction patterns show the appearance of a commensurate magnetic order at TN with the propagation vector k = (100) and the emergence of an additional incommensurate phase below 30 K, while both phases coexist at 2 K. The commensurate magnetic structure is best described by the P42/nc`m` Shubnikov space group.
Materials Science
no code implementations • 12 Jan 2021 • Sumit Ranjan Maity, Monica Ceretti, Lukas Keller, Jürg Schefer, Martin Meven, Ekaterina Pomjakushina, Werner Paulus
In addition, magnetic satellite reflections adapt exactly the same modulation vectors as found for the oxygen ordering, evidencing a unique coexistence of 3D modulated ordering for spin and oxygen ordering in Nd${}_{2}$NiO${}_{4. 10}$.
Applied Physics
