Observation of spontaneous magnetization jump and field-induced irreversibility in Nd5Ge3
Magnetic Materials Laboratory, Department of Physics, Indian Institute of Technology Bombay Mumbai-400076, India
2 Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai-400005, India
Accepted: 26 July 2010
We report the observation of spontaneous and ultra-sharp jumps in the low-temperature magnetization isotherms of polycrystalline Nd5Ge3. Field-induced and ultra-sharp jumps are also seen in resistivity and heat capacity data. These jumps are accompanied by field-induced irreversibility. The consistency seen in these three data clearly shows that the spin, electronic and lattice states are strongly coupled. Time-induced growth of the ferromagnetic phase is observed at a constant field and temperature, implying the metastability of the magnetic phase in the low field region. Various experimental findings point towards a strong field-induced magneto-structural irreversibility in this compound.
PACS: 75.30.Kz – Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.) / 75.60.Ej – Magnetization curves, hysteresis, Barkhausen and related effects / 75.47.Np – Metals and alloys
© EPLA, 2010