In high-entropy alloys (HEAs), high entropy of mixing stabilizes disordered solid solution phases with simple structures like a body-centered cubic or a face-centered cubic lattice. HEA structure is characterized by a topologically ordered lattice with an exceedingly high chemical (substitutional) disorder, so that a HEA can be conveniently termed as a "metallic glass on an ordered lattice". We have reported the discovery of the first superconducting HEA Ta-Nb-Hf-Zr-Ti, which shows a high superconducting transition temperature (for a metallic system) of 7.3 K and a large upper critical field of 8.2 T. We have studied the superconducting transition in samples of different chemical composition subjected to different thermal annealing procedures and showed that the superconductivity is a robust phenomenon.
COBISS.SI-ID: 30087463
We have presented synthesis of the first ternary compound in the Cu-Ca-Gd system, where the immiscible elements Ca and Gd are chemically bound in a crystal by the third »intervening« element copper, which makes stable binary phases with both elements. We determined physical properties for this new ternary alloy and showed that its magnetic state can be described as a random-anisotropy ferromagnet.
COBISS.SI-ID: 29348135
For the first time we have experimentally proved the existence of Schottky effect in quasicrystals and related intermetallic compounds. This discovery fundamentally changes current interpretations of the low-temperature electronic and magnetic effects in quasicrystals and their periodic approximants. We have developed the theory of Schottky effect for pentagonal symmetry of the crystal electric fields.
COBISS.SI-ID: 29311015