Superconductivity of Thorium below l°k

Wolcott, N. M.; Hein, R. A.

doi:10.1080/14786435808565801

Cited by 15 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Habitat quality scores and important habitat metrics such as embeddedness or sedimentation were not significantly different in relation to distance from coal mines or transportation corridors for the watershed as a whole (ANOVA, p > 0.50; N ) 108), contrary to expectations based on the literature (29,32). These results may be due, in part, to the fact that other land uses such as cropland or pasture also result in increased sedimentation and therefore may have masked a specific effect of mining on sedimentation.…”

Section: Resultscontrasting

confidence: 55%

Identifying Sources of Stress to Native Aquatic Fauna Using a Watershed Ecological Risk Assessment Framework

Diamond

Serveiss

2001

Environ. Sci. Technol.

View full text Add to dashboard Cite

The free-flowing Clinch and Powell River Basin, located in southwestern Virginia, United States, historically had one of the richest assemblages of native fish and freshwater mussels in the world. Nearly half of the species once residing here are now extinct, threatened, or endangered. The United States Environmental Protection Agency's framework for conducting an ecological risk assessment was used to structure a watershed-scale analysis of human land use, in-stream habitat quality, and their relationship to native fish and mussel populations in order to develop future management strategies and prioritize areas in need of enhanced protection. Our analyses indicate that agricultural and urban land uses as well as proximity to mining activities and transportation corridors are inversely related to fish index of biotic integrity (IBI) and mussel species diversity. Forward stepwise multiple regression analyses indicated that coal mining had the most impact on fish IBI followed by percent cropland and urban area in the riparian corridor (R 2 ) 0.55, p ) 0.02); however, these analyses suggest that other site-specific factors are important. Habitat quality measures accounted for as much as approximately half of the variability in fish IBI values if the analysis was limited to sites within a relatively narrow elevation range. These results, in addition to other data collected in this watershed, suggest that nonhabitat-related stressors (e.g., accidental chemical spills) also have significant effects on biota in this basin. The number of cooccurring human land uses was inversely related to fish IBI (r ) -0.49, p < 0.01). Sites with g2 co-occurring land uses had >90% probability of having <2 mussel species present. Our findings predict that many mussel concentration sites are vulnerable to future extirpation. In addition, our results suggest that protection and enhancement of naturally vegetated riparian corridors, better controls of mine effluents and urban runoff, and increased safeguards against accidental chemical spills, as well as reintroduction or augmentation of threatened and endangered species, may help sustain native fish and mussel populations in this watershed.

show abstract

Section: Resultscontrasting

confidence: 55%

Identifying Sources of Stress to Native Aquatic Fauna Using a Watershed Ecological Risk Assessment Framework

Diamond

Serveiss

2001

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…6(a), we see that the ground state of Th, Pa, and U are in the superconducting region (blue). Indeed, the superconducting transition temperatures, T c , for Th = 1.4 K (Wolcott and Hein, 1958;Gordon et al, 1966), Pa = 1.4 K (Fowler et al, 1965;Smith et al, 1979a), and U = 0.7 or 1.8 K depending on crystal structure (orthorhombic α-U T c = 0.7 K and fcc γ-U T c = 1.8 K. Chandrasekhar and Hulm, 1958). Under pressure, the superconducting transition temperature of Th drops from 1.4 K to ~0.7 K (Palmy et al, 1971;Fertig et al, 1972;Griveau and Rebizant, 2006).…”

Section: Superconductivity In Th Pa and Umentioning

confidence: 99%

Nature of the5fstates in actinide metals

2009

View full text Add to dashboard Cite

Actinide elements produce a plethora of interesting physical behaviors due to the 5f states. This review compiles and analyzes progress in understanding of the electronic and magnetic structure of the 5f states in actinide metals. Particular interest is given to electron energy-loss spectroscopy and many-electron atomic spectral calculations, since there is now an appreciable library of core d → valence f transitions for Th, U, Np, Pu, Am, and Cm. These results are interwoven and discussed against published experimental data, such as x-ray photoemission and absorption spectroscopy, transport measurements, and electron, x-ray, and neutron diffraction, as well as theoretical results, such as density-functional theory and dynamical mean-field theory.

show abstract

“…Certain actinide metals are known to exhibit superconductivity at low temperature. These include Th at 1.4 K [175],…”

Section: Superconductivitymentioning

confidence: 99%

Advances in actinide thin films: synthesis, properties, and future directions

Vallejo¹,

Kabir²,

Poudel³

et al. 2022

Rep. Prog. Phys.

View full text Add to dashboard Cite

Actinide-based compounds exhibit unique physics due to the presence of 5f electrons and serve in many cases as important technological materials. Targeted thin film synthesis of actinide materials has been successful in generating high-purity specimens in which to study individual physical phenomena. These films have enabled the study of the unique electron configuration, strong mass renormalization, and nuclear decay in actinide metals and compounds. The growth of these films, as well as their thermophysical, magnetic, and topological properties, have been studied in a range of chemistries, albeit far fewer than most classes of thin-film systems. This relative scarcity is the result of limited source material availability and safety constraints associated with the handling of radioactive materials. Here, we review recent work on the synthesis and characterization of actinide-based thin films in detail, describing both synthesis methods and modeling techniques for these materials. We review reports on pyrometallurgical, solution-based, and vapor deposition methods. We highlight the current state-of-the-art in order to construct a path forward to higher quality actinide thin films and heterostructure devices.

show abstract

Superconductivity of Thorium below l°k

Cited by 15 publications

References 4 publications

Identifying Sources of Stress to Native Aquatic Fauna Using a Watershed Ecological Risk Assessment Framework

Identifying Sources of Stress to Native Aquatic Fauna Using a Watershed Ecological Risk Assessment Framework

Nature of the5fstates in actinide metals

Advances in actinide thin films: synthesis, properties, and future directions

Contact Info

Product

Resources

About