A materials informatics approach to the identification of one-band correlated materials analogous to the cuprates

One important yet exceedingly rare property of the cuprate high-temperature superconductors is the presence of a single correlated $d$ band in the low-energy spectrum, leading to the one-band Hubbard model as the minimal description. In order to search for materials with interesting strong correlation physics as well as possible benchmark systems for the one-band Hubbard model, here we present a new approach to find one-band correlated materials analogous to the cuprates by leveraging the emerging area of materials informatics. Using the composition, structure, and formation energy of more than half a million real and hypothetical inorganic crystalline materials in the Open Quantum Materials Database, we search for synthesizable materials whose nominal transition metal $d$ electron count and crystal field are compatible with achieving an isolated half-filled $d$ band. Five Cu compounds, including bromide, oxide, selenate, and pyrophosphate chemistries, are shown to successfully achieve the one-band electronic structure based on density functional theory band structure calculations. Further calculations including magnetism and explicit on-site Coulomb interaction reveal significant evidence for strong correlation physics in the five candidates, including Mott insulating behavior and antiferromagnetism. The success of our data-driven approach to discovering new correlated materials opens up new avenues to design and discover materials with rare electronic properties

SMME Performance—Results from a Longitudinal Study (2003-2012)

The small and medium enterprise sector is often purported to be a significant driving force within the modern economy. Over the last two decades various studies have concluded that creativity and innovation are influential factors that contributed significantly to job and wealth creation. The purpose of this study was firstly, to determine how SMMEs created jobs consistently over a ten year period. Secondly, the study aimed to determine customer, profit and sales growth as measures of business success. This study involved a longitudinal research design with a quantitative approach and a sample size of 117 participants. The pilot study started in 2003 with data obtained from 117 participants. 49% of these participants were still operational in 2012. 52% of these business owners prepared to provide data. The remainder of the 117 participants (represented by 51%) were untraceable and therefore, assumed to have failed. The performance parameters included the number of employees, customers, value of sales and profit. Our research clearly showed that when the economic situation is favourable, SMMEs create jobs and wealth, however, as soon as there is a downturn in the economy, both job and wealth creation is reduced

Knights of the Switch: A Study of the White Caps and Their Violent Resistance to Social and Moral Change in the United States

Beginning in the 1870s, multiple secret vigilante groups were formed across the United States to violently resist the changing social and moral standards of the country. These groups, collectively known as White Caps, originated in Southern Indiana, and later spread across the United States in the last part of the nineteenth century, committing brutal acts of terrorism against anyone whom the group deemed a threat to the moral and social standards of their specific community

Contemporary political theorists in context

Charting the progression from the preoccupation with the boundaries of the modern state, through to the current debates on rights, identity and justice; the three sections of the book enable the ideas of significant political thinkers to unfold through a telling of the key political events that gave a social context for their thought: Section I: The Inter-War Debate: Weber, Gramsci and Schmitt Section II: Post-War Debates: Arendt, Oakeshott, De Beauvoir and Adorno Section III: Contemporary Debates: Rawls, Nozick, Kymlicka and Foucault Written in an accessible and concise format, features include: 'rewind' and 'fast-forward' indicators to easily guide students around the text discussion points, revision notes and further reading in each chapter informative text boxes to highlight key concepts, people and events. By exploring an often ignored relationship in political thought, the influence of thought upon historical change and the influence of historical change upon theory, this text delivers new and exciting angles from which to approach politics today. Contemporary Political Theorists in Context is essential reading for all students of social and political theory