2012/06/30 by Yu Kawasaki, Y. Kawasaki, T. Minami +16
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Magnetic and transport properties of perovskites and related materials #Materials science #Muon #Muon spin spectroscopy #Nuclear magnetic resonance #Paramagnetism #Phase (matter) #Physics #Quantum mechanics #Rare-earth and actinide compounds #Relaxation (psychology) #Spin (aerodynamics) #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.86.125141
arxiv created 2012/09/25 · openalex publication_date 2012/09/28 · arxiv updated 2015/06/05 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The magnetically ordered states of the A-site ordered perovskite manganites LaBaMn2O6 and YBaMn2O6 have been investigated by muon spin relaxation in zero external magnetic field. Our data reveal striking differences in the nature of the magnetically ordered state between these materials. For LaBaMn2O6, the \ensuremathμSR time spectra in the ferromagnetic state below \ensuremath≃330 K reveal a strongly inhomogeneous phase, reminiscent of a Griffiths phase. Within this magnetically inhomogeneous phase, an antiferromagnetic state develops below 150 K, which displays well defined static internal magnetic fields, but reaches only 30% of the volume fraction at low temperatures. A broad distribution of \ensuremathμSR relaxation rates is inferred down to the lowest temperatures. This behavior is similar to that in the A-site disordered La0.5Ba0.5MnO3. On the other hand, for YBaMn2O6, the \ensuremathμSR time spectra for both (i) the charge and orbital ordered and (ii) the paramagnetic phases reveal rather homogeneous states, namely, an exponential relaxation in the paramagnetic state and well defined muon spin oscillation in the antiferromagnetic state.