Spin-wave scattering at low temperatures in manganite films
نویسندگان
چکیده
The temperature T and magnetic field H dependence of the resistivity r has been measured for La0.82ySr0.2MnO3 (y50 and 0.128! films grown on ~100! SrTiO3 substrates. The low-temperature r in the ferromagnetic metallic region follows well r(H ,T)5r0(H)1A(H)vs /sinh(\vs/2kBT)1B(H)T 7/2 with r0 being the residual resistivity. We attribute the second and third term to small-polaron and spin-wave scattering, respectively. Our analysis based on these scattering mechanisms also gives the observed difference between the metal-insulator transition temperatures of the films studied. Transport measurements in applied magnetic field further indicate that spin-wave scattering is a key transport mechanism at low temperatures.
منابع مشابه
Nanopillar spin filter tunnel junctions with manganite barriers.
The potential of a manganite ferromagnetic insulator in the field of spin-filtering has been demonstrated. For this, an ultrathin film of Sm0.75Sr0.25MnO3 is integrated as a barrier in an epitaxial oxide nanopillar tunnel junction and a high spin polarization of up to 75% at 5 K has been achieved. A large zero-bias anomaly observed in the dynamic conductance at low temperatures is explained in ...
متن کاملSpin-polarized tunneling spectroscopic studies of the intrinsic heterogeneity and pseudogap phenomena in colossal magnetoresistive manganite La0.7Ca0.3MnO3
Spatially resolved tunneling spectroscopic studies of colossal magnetoresistive (CMR) manganite La0.7Ca0.3MnO3 (LCMO) epitaxial films on (LaAlO3)0.3(Sr2AlTaO6)0.7 substrate are investigated as functions of temperature, magnetic field and spin polarization by means of scanning tunneling spectroscopy. Systematic surveys of the tunneling spectra taken with Pt/Ir tips reveal spatial variations on t...
متن کاملStudy of spin-ordering and spin-reorientation transitions in hexagonal manganites through Raman spectroscopy
Spin-wave (magnon) scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions. In this paper, we present how to observe magnon scattering clearly by Raman spectroscopy, then apply the Raman method to study spin-ordering and spin-reorientation transitions of hexagonal manganite single crystal and thin films and compare directly wit...
متن کاملExperimental evidence of a cluster-glass transition on the colossal magnetoresistance manganite
Neutron small angle scattering on a colossal magnetoresistance material shows clear signatures of a rise in characteristic length of paramagnetic fluctuations as the maximum of dc susceptibility is approached from high temperatures. The phenomenon is accompanied by a rise in intensity of a broad peak that appears at wave vectors of Q<0.025 Å−1, and this is interpreted as a fingerprint of the on...
متن کاملObservation of strain and temperature induced changes in the band structure of thin La0.8MnO3− films
Mn K-edge resonant inelastic x-ray scattering measurements were performed on films of La0.8MnO3− . The measurements reveal that strain causes large shifts of the bands above the Fermi level. The Mn 3d band switches from a narrow upshifted peak at high temperature to a broad bulklike band at low temperature in ultrathin films. The strain induced switching behavior opens the possibility of tuning...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003