Layered Pnictides are proven to be a great reservoir for superconductors in
the past and ternary zirconium pnictide chalcogenides of ZrXY-type (X = P, As;
Y = S, Se) might be a platform for new superconductors. The superconducting
properties of carefully grown (chemical transport reaction) single crystals of
ZrP1.54S0.46 with a transition temperature of Tc = 3.5 K are investigated.
This compound (PbFCl structure type) contains square planar nets: One of the
nets is completely occupied (no vacancies) by P, the other one characterized
by a random distribution of P and S (full occupation: no vacancies). Besides
zero-field-cooling (zfc), field-cooling (fc), and remanent moment (rem)
measurements, especially magnetization and ac susceptibility measurements are
performed. A nearly ideal type-II behavior with a Ginzburg-Landau parameter κ
= 24 is found. The magnetization curves between Bc1 and Bc2 for increasing
field are in excellent agreement with theoretical calculations performed by E.
H. Brandt based on the Ginzburg-Landau theory. The decreasing branches of the
magnetization curves are asymmetric about the field axis indicating weak
pinning and also large diamagnetic behavior