MLZ ist eine Kooperation aus:
> Technische Universität München> Helmholtz-Zentrum Hereon > Forschungszentrum JülichMLZ ist Mitglied in:
MLZ in den sozialen Medien:
MLZ
Lichtenbergstr.1
85748 Garching
Understanding the microscopic origins of electronic phases in high-transition temperature (high-Tc) superconductors is important for elucidating the mechanism of superconductivity. In the paramagnetic tetragonal phase of BaFe2−xTxAs2 (where T is Co or Ni) iron pnictides, an in-plane resistivity anisotropy has been observed. Here, we use elastic and inelastic neutron scattering to determine the effect of uniaxial pressure on magnetic and structure phase transitions, show that low-energy spin excitations in these materials change from fourfold symmetric to twofold symmetric at temperatures corresponding to the onset of the in-plane resistivity anisotropy. Because resistivity and spin excitation anisotropies both vanish near optimal superconductivity, we conclude that they are likely intimately connected.
Datum | 24.06.2016 |
Uhrzeit | 14:30 - 15:30 Uhr |
Ort | Garching, Deutschland |
Raum | JCNS Seminarraum |
Sprecher | Pengchen Dai (Rice University, USA) |
Veranstalter | MLZ, TUM |
MLZ ist eine Kooperation aus:
> Technische Universität München> Helmholtz-Zentrum Hereon > Forschungszentrum JülichMLZ ist Mitglied in:
MLZ in den sozialen Medien: