Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Kondo Physics, f-Electron Systems and Heavy Fermions
TT 6.5: Vortrag
Montag, 5. September 2022, 16:00–16:15, H22
Pressure tuning of the low-temperature states of CeRh2As2 — •Meike Pfeiffer1, Konstantin Semeniuk2, and Elena Hassinger1,2 — 1Technische Universität München, 85748 Garching, Germany — 2Max Planck Institut für chemische Physik fester Stoffe, 01187 Dresden, Germany
CeRh2As2 is a heavy-fermion superconductor with a centrosymmetric tetragonal crystal structure lacking local inversion symmetry at the Ce sites. It presents two-phase superconductivity with an exceptionally high ratio of critical field (> 15 T) to critical temperature (Tc = 0.3 K). An additional phase can be observed below 0.4 K, believed to be a quadrupole-density wave (QDW) order. We conducted an electrical resistivity study of CeRh2As2 down to 30 mK applying hydrostatic pressure up to 3 GPa. We find that under pressure the Kondo coherence peak shifts linearly to higher temperature at a rate of 10 K/GPa. The QDW order is highly sensitive to lattice compression and gets fully suppressed at about 0.7 GPa. The superconducting Tc decreases with a significantly lower rate suggesting no influence of QDW on superconductivity. The upper critical fields show an anisotropic behaviour: for H ∥ c it decreases, whereas for H ∥ a,b it increases for pressures up to ≈ 0.9 GPa and then also decreases. We relate our observations to the change of the relevant energy scales, such as Kondo temperature, Rashba spin-orbit coupling, and interlayer hopping.