arXiv subjects

O. P. Isikaku-Ironkwe

Publications and source records attributed to O. P. Isikaku-Ironkwe.

11 recordsLinked to original sources

arXiv2012

Searching for High-Tc Superconductivity in the Z = 8.67 Family

CaLi2, a member of the Z =8.67 family, with Ne =1.333 is superconducting at 14K at 40 GPA pressure. Through computational combinatorial synthesis of the Z =4.67 and Z=12.67 families, we create new members of the Z =8.67 family. We discover over 160 potential members of the Z = 8.67 family with Ne=2.67 that have more than three elements. Our estimations suggest that most of them will be superconducting with Tcs between 30K and 60K at ambient pressure.

cond-mat.supr-con↗

arXiv2012

Possible High-Tc Superconductivity in Z = 7.33 Materials from Combinatorial Synthesis of Z = n (n=4.67, 10, 12.67) Families

The search for MgB2-like superconductivity has before now been limited to binary and ternary systems. However systems with more-than-three-elements that meet the MgB2 model have yet to be investigated either computationally or experimentally. Here we show that through computational synthesis of two binary or ternary materials from the Z=4.67, 10 and 12.67 families, we can get Z=7.33 systems with more-than-three elements. We have identified over 300 of such possibilities for further studies. We propose that the resultant combinatorial synthesis of such Z=7.33 systems with more-than-three-elements and that meet the MgB2 model will be superconducting with Tcs higher than 39K.

cond-mat.supr-con↗

arXiv2012

Searching for Superconductivity in the Z = 12.67 Family

The Z = 12.67 family of materials includes CaBeSi and NaAlSi which have been reported as non-superconducting and superconducting respectively. We show with an algorithm how to generate other members of this family. We discover through the material specific characterization dataset (MSCD) scheme and the symmetry conditions for superconductivity, why some are superconducting and others may not be superconducting.We estimate too the Tcs of members of this interesting family of materials.

cond-mat.supr-con↗

arXiv2012

Searching for Superconductivity in the Z = 4.67 Family

Lithium borocarbide, LiBC, a member of the Z = 4.67 family of materials, is not a superconductor. Using ternary combinations of elements that give Z = 4.67 and the material specific characterization dataset (MSCD) scheme, we discover other members of this family. We predict that most of them will not be superconducting and offer an explanation in terms of valence electrons and atomic number ratios. We propose that by appropriately increasing the atomic number while keeping the valence electron count constant, we can transform them into MgB2-like superconductors. We show some examples of such transformations. Alternatively, reducing the valence electron count to 2 while keeping Z constant may lead to high-Tc in the Z=4.67 family.

cond-mat.supr-con↗

arXiv2012

Searching for Superconductivity in Z=10 Family of Materials

Binary and ternary materials with average atomic number (Z) of 10 have average valence electrons of 2.67. The material specific characterization dataset (MSCD) scheme, superconductivity symmetry search rules and the Tc estimation formula, earlier developed are used in this search for binary and ternary superconductors with low Z like MgB2. Here we identify 17 potential superconducting Z=10 materials and estimate their Tcs prior to experimental investigations.

cond-mat.supr-con↗

arXiv2012

Lithium Beryllium Phosphide (LiBeP): A possible MgB2-like Superconductor

The search for materials similar to magnesium diboride, MgB2, based on structure and electronic similarity did not produce close enough superconductors in terms of Tc. Changing the search to iso-electronic and iso-atomic number equivalents opened new doors to very many possible MgB2-like superconductors. Here we present LiBeP which meets these new conditions. We estimate its Tc to be 34.5K if two-gapped or 17.2K if single gapped.

cond-mat.supr-con↗

arXiv2012

MgBeC: A potential MgB2-like Superconductor

Intensive and extensive searches for superconductivity in materials iso-structural, iso-electronic and iso-valent with magnesium diboride, MgB2, have not produced superconductors with Tc close to 39K. Recently, we proposed lithium magnesium nitride, LiMgN, as a potential MgB2-like superconductor, based on symmetry considerations of averages of electronegativity, valence electrons, atomic number and formula weight. Our studies show that there are other materials that meet the same symmetry considerations like LiMgN. Here we propose that magnesium beryllium carbide, MgBeC, one of such materials, should be a superconductor like MgB2, with Tc near 39K.

cond-mat.supr-con↗

arXiv2012

Beryllium Silicide Clusters, BenSin, Be2nSin (n = 1 - 4) and possible MgB2-like Superconductivity in some of them

The symmetry of the Periodic Table makes it possible to predict certain properties of similar elements and compounds using one of them as a template. Magnesium diboride, MgB2, presents a useful template in the search for similar materials. Starting from electronegativity, valence electron and atomic number equivalency, we identify many potential similar materials. One of them is the beryllium silicide, Be2nSin cluster system. We establish that though not yet produced in bulk, Be2Si exists. We show from symmetry principles that beryllium silicide and some of its clusters will be MgB2-like superconductors with Tcs close to or higher than 39K.

cond-mat.supr-con↗

arXiv2012

Is Lithium Sulfide a MgB2-like Superconductor?

Lithium Sulfide, Li2S, is an anti-fluorite semiconductor with a band-gap of 3.865 eV. It also has exactly the same valence electron count, Ne, and atomic number, Z, as magnesium diboride, MgB2. Both have almost the same formula weight. This qualifies Li2S as a magnesium-diboride like material. Li2S passes the same computational material specific test for superconductivity as MgB2. Using our recently developed symmetry rules for searching for superconductors, we predict that Li2S, with electronegativity of 1.5, will be superconducting with a Tc of 33.8K, if double-gapped or 16.9K if single gapped.

cond-mat.supr-con↗

arXiv2012

Prospects for Superconductivity in LiBSi

The search for superconductivity in materials iso-structural and iso-electronic with magnesium diboride, MgB2, has not yielded results with Tc near 39K. In particular, Lithium borocarbide, LiBC, and its modification Li0.5BC, proved to be non-superconducting. Using our materials-specific condition for superconductivity and the symmetry principles for superconductor search, we show that LiBC cannot be a superconductor. By replacing C in LiBC with Si we achieve valence electron count (Ne) and atomic number (Z) symmetry with MgB2. We therefore predict that Lithium boron silicon, LiBSi, should be a superconductor with Tc comparable to MgB2.

cond-mat.supr-con↗

arXiv2012

Possible High-Tc Superconductivity in LiMgN: A MgB2-like Material

The search for superconductivity in materials iso-structural and iso-valent with magnesium diboride, MgB2, has not yielded any results close enough to the 39K Tc of MgB2. Lithium magnesium nitride, LiMgN, resembles MgB2 in that they both have the same averages of electronegativity, valence electron count and atomic number. Their formula weights are very close too. Using our recently published chemical symmetry rules for estimating superconductivity and Tcs of materials, we predict that LiMgN, a semiconductor at room temperature, with the same material specific characterization dataset (MSCD) as MgB2, should be a superconductor, in the ordered α-phase or the orthorhombic phase, when cooled to 39K.

cond-mat.supr-con↗