Abstract
We searched for new structural, magnetic and superconductivity phases in the Pr–Si system using high-pressure high-temperature and arc melting syntheses. Both high and low Si concentration areas of the phase diagram were explored. Although a similar approach in the La–Si system produced new stable superconducting phases, in the Pr–Si system we did not find any new superconductors. At low Si concentrations, the arc-melted samples were doped with C or B. It was found that addition of C gave rise to multiple previously unknown ferromagnetic phases. Furthermore, X-ray refinement of the undoped samples confirmed the existence of the so far elusive Pr3Si2 phase.
Highlights
We investigated the Pr–Si system using high-pressure hightemperature (HP–HT) and arc melting syntheses with C and B doping
High resolution synchrotron powder diffraction (HRXRD) data were measured in a transmission capillary geometry using the mail-in program at beamline 11-BM of the Advanced Photon Source (APS), at Argonne National Laboratory, with a wavelength of 0.41352 Å
This indicates that the Pt capsule used in the HP–HT synthesis is reacting with the materials
Summary
We investigated the Pr–Si system using high-pressure hightemperature (HP–HT) and arc melting syntheses with C and B doping. Following our previous search for superconductors in the La–Si system [1], we have extended the study to Pr–Si compounds. While much work has been done on the phase diagram of binary Pr-silicides, there are still a number of open questions [2]. Before this work, the existence of Pr3Si2 was uncertain. The presence of Pr3Si2 was first reported in Ref. [3], but has not been reproduced in more recent studies [2,4,5]. Magnetic and electrical properties of the binary system have been extensively studied [5]. In the binary system there are six ferromagnetic compounds showing different Curie temperatures (TC): Pr5Si3 (TC 1⁄4 42–44 K) [5,6,7], Pr5Si4 (TC 1⁄4 40 K) [5], PrSi (TC 1⁄4 51–54 K) [5,8], Pr3Si4 (TC 1⁄4 100–105 K) [5,9], Pr3Si5 (TC 1⁄4 11.5 K) [10] and PrSi2 (TC 1⁄411.5 K) [11], as well as one antiferromagnetic compound, PrSi2−x (x1⁄4 0.12), with the Neel temperature TN1⁄4 11 K [5]
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