Colossal pilomatrixoma

Colossal magnetocapacitance and colossal magnetoresistance in HgCr2S4.

We present a detailed study of the dielectric and charge transport properties of the antiferromagnetic cubic spinel HgCr2S4. Similar to the findings in ferromagnetic CdCr2S4, the dielectric constant of HgCr2S4 becomes strongly enhanced in the region below 60-80 K, which can be ascribed to polar relaxational dynamics triggered by the onset of ferromagnetic correlations. In addition, the observat...

Multifocal type of pilomatrixoma.

Pilomatrixoma is a benign skin neoplasm that arises from hair follicle matrix cells. The skin lesion occurs usually as a solitary tumor and the multifocal types are very rare. Skin changes can be described as a firm to hard, non-painful, oval-shaped tumor that is covered by normal skin. It commonly occurs on a scalp, face, neck and rarely back and extremities. Complete surgical excision with th...

Periocular pilomatrixoma: case report.

The aim is to present a case of pilomatrixoma in the periocular area in a 10-year-old female through retrospective review of medical records of a single patient. A 10-year-old female developed a lesion under her right eyebrow over a period of one year. The rest of the ophthalmic history was unremarkable. On examination, oval, well-defined, subcutaneous tumor measuring 7 x 4 mm was found under t...

Colossal magnetoresistance

We review recent experimental work falling under the broad classification of colossal magnetoresistance (CMR), which is magnetoresistance associated with a ferromagnetic-toparamagnetic phase transition. The prototypical CMR compound is derived from the parent compound, perovskite LaMnO3. When hole doped at a concentration of 20–40% holes/Mn ion, for instance by Ca or Sr substitution for La, the...

Colossal Magnetoresistance