| 1 | Magnetic and specific heat studies of the frustrated Er_2Mn_2O_7 compound显示文摘A new Er2Mn2O7 compound was synthesized by the ceramic method and its crystal structure was characterized using powder X-ray diffraction (XRD) and observed by scanning electron microscopy (SEM). The magnetic properties were investigated using a BS2 magnetometer and the heat capacity was studied using a quantum design (PPMS). The structural study revealed that this compound was monophasic and crystallized in the monoclinic system with the P2/M space group. Magnetization measurements were carried out in the temperature range of 1.8-200 K under an applied magnetic field of 0.05 T. A crossover from a room temperature paramagnetic phase to an antiferromagnetic one at low temperature was detected from the magnetic study. The magnetic susceptibility, in the paramagnetic region above 40 K, was found to present a simple Curie-Weiss type behavior. From the specific heat (CP) measurements in magnetic fields up to 5 T, we noted the presence of a wide peak characteristic of a second order mag-neto-structural transition. | N.Ben Amor M.Bejar E.Dhahri M.A.Valente P.Lachkar E.K.Hlil | 2013 | Journal of Rare Earths2013，31，1： | 0 |
| 2 | Optimal Bandgap of Double Perovskite La-Substituted Bi2FeCrO6 for Solar Cells:an ab initio GGA+U Study显示文摘The ab initio generalized gradient approximation(GGA)+U study of multiferroic(La_(0.5)Bi_(0.5))_2 FeCrO_6 in pnma structure and ferri-magnetic order, including Hubbard corrections(U = 4.1 eV) for transition metal/rare earth d-electrons with 20 atoms cell, shows optimum local magnetic moments of(Cr^(3+),Fe^(3+)) equal to(-2.56, 4.14) μB and an ideal spin-down band gap of 1.54 eV. Tuned-band gap La-substituted double oxide perovskites BFCO should exhibit enhanced visible-light absorption and carrier mobility, thus could be convenient light absorbers and then efficient alternatives to wide-gap chalcopyrite absorber-based solar cells failing to achieve highest power conversion efficiencies, and even compete with their metal-organic halide perovskites counterparts. | B.Merabet H.Alamri M.Djermouni A.Zaoui S.Kacimi A.Boukortt M.Bejar | 2017 | Chinese Physics Letters2017，34，1： | 0 |
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