Interchanging autoimmunity - lupus mastitis coexisting with systemic polyarteritis nodosa

Lupus mastitis is an uncommon presentation of lupus erythematosus profundus (LE profundus), characterized by inflammation of the subcutaneous fat. LE profundus occurring as initial manifestation of LE is rare. We report a case where the patient presented with lupus mastitis and years later, she developed disseminated discoid LE (DLE) and polyarteritis nodosa (PAN). PAN and DLE are connective tissue diseases with different etiologies, clinical, immunological, and histopathological features. One connective tissue disease evolving into another is rare, and the reasons remain unexplained. This woman had histopathologically proven DLE and lupus mastitis with a negative antinuclear antibody profile. She satisfied the American College of Rheumatology criteria for PAN

Polarons induced electronic transport, dielectric relaxation and magnetodielectric coupling in spin frustrated Ba2FeWO6

Mixed valent double perovskite Ba2FeWO6, with tetragonal crystal structure, synthesized in a highly controlled reducing atmosphere, shows antiferromagnetic transition at T-N = 19 K. A cluster glass-like transition is observed around 30 K arising from the competing interactions between inhomogeneous magnetic states. The structural distortion leads to the formation of polarons that are not contributing to DC conduction below charge ordering temperature, T-co = 279 K. Above Tco, small polarons will start to hop by exploiting thermal energy and participate in the conduction mechanism. The polarons are also responsible for the dielectric relaxor behavior, in which the dielectric relaxation time follows non linearity in temperature as proposed by Fulcher. The material also exhibits a small room temperature magnetoresistance of 1.7% at 90 kOe. An intrinsic magnetodielectric coupling of similar to 4% near room temperature and at lower temperatures, as well as an extrinsic magnetodielectric coupling change from +4% to-6% at around 210K are reported. (C) 2015 Elsevier Ltd. All rights reserved

Kinetically induced low-temperature synthesis of Nb3Sn thin films

Nb3Sn thin films are promising candidates for future application in superconducting radio frequency cavities due to their low surface resistivity, high critical temperature, and critical field, as compared to bulk niobium, which is the current state of the art. In this paper, we report the deposition of Nb3Sn thin films by magnetron co-sputtering at the extremely low temperature of 435 degrees C. These thin films show a critical temperature of 16.3 K, a high critical current density of 1.60 x 10(5) A/cm(2), and a strong shielding effect. The key to achieving low-temperature growth is the independent kinetic control of Nb and Sn species in the sputtering process. From a technological viewpoint, the low-temperature approach paves the way for the use of Nb3Sn as a coating in cryogenic efficient copper based cavities, thereby avoiding the detrimental interdiffusion of Cu