Observation of magnetic ordering in La2CuO4 by muon spin rotation spectroscopy

Tuning competing orders inLa2−xSrxCuO4cuprate superconductors by the application of an external magnetic

“…Due to its dipolar character, B(r) is directly proportional to the ordered Cu 2+ moment. For LNSCO the internal field at T = 5 K is found to be 27 mT which is about 2/3 of the value observed in the undoped compound La 2 CuO 4 [28,29]. Assuming a value of 0.6 µ B for the Cu 2+ moment in La 2 CuO 4 , the internal field corresponds to a local ordered moment µ lo ≈0.36 µ B .…”

Muon Spin Rotation in High TcSuperconductors

“…The antiferromagnetism was detected there in the studies of susceptibility [21], neutron scattering [22][23][24] and μSR [25,26]. In μSR studies the magnetic ordering was seen as spontaneous oscillations in zero-field experiments.…”

“…Such minor changes of the local magnetic fleld at the muon site strongly suggest that the whole effect is mainly caused by the changes in the magnetic interactions between Cu spins rather than by the changes of the magnetic moment of the spin itself [28]. The μSR experiment cannot distinguish between long-range ordering and freezing of short-range correlations.…”

“…The work of Budnick at al. [28] (where the "oxygen treated" sample had TN = 300 K, i.e. higher than the standard sample) strongly suggests the other scaling of TN versus b.…”

“…For such materials the magnetism was found in the series of zero field µSR experiments [28,33,34]. The example of temperature dependence of µSR frequencies in these materials is shown in Fig.…”