cg9b00908_si_001.pdf (1.12 MB)
Reentrant Spin-Glass Behavior in Cobalt(II) Based Coordination Polymers
journal contribution
posted on 2019-10-20, 18:29 authored by Akashdeeep Nath, S. S. Islam, Prashanta K. Mukharjee, Ramesh Nath, Sukhendu MandalCorrelation of molecular
structure and its magnetic property gives
a better understanding toward the design of magnetic materials with
long-range magnetic order. Here we report two new cobalt-based coordination
polymers that exhibited coexistence of long-range ferromagnetic (FM)
order and spin-glass (SG) transition at below Tc. Different orientation of magnetic moments, arrangements,
and variation in connectivity with the ligands might be responsible
for the SG transition. The SG transition was characterized by bifurcation
of zero-field-cooled and field-cooled splitting at Tf ≈ 9.9 K (for both compounds) and AC susceptibility
measurements. DC magnetization revealed the FM transition at high
temperature, followed by a low-temperature SG transition. Moreover,
the peculiarity found in low-temperature χ′′(T) can be attributed to the complex interplay between
antiferromagnetic and ferromagnetic interactions and the coexistence
of the long-range FM order and SG phase. Optical bandgap and temperature-dependent
resistivity measurements showed that these compounds are semiconducting
in nature.