We report an anomalous temperature T variation of the field Hon for the onset of the second magnetization peak in La1.81 Sr0.19 CuO4 single crystals with the external magnetic field H oriented parallel to the c axis. While the peak field Hp has a continuous decrease with increasing T, Hon exhibits a sudden decrease for T∼11-15K. This behavior appears to be related to the particular T dependence of the superfluid density in the case of two-band superconductivity affecting the T variation of the elastic energy of the vortex system at low H.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版物ステータス||Published - 2008 7 29|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics