AI Article Synopsis
- Measurements of Mg11B2's specific heat between 1 and 50 K in magnetic fields up to 9 T reveal a Debye temperature of 1050 K and a normal-state electron contribution coefficient of gamma(n) = 2.6 mJ mol(-1) K-2.
- At the superconducting transition temperature (T(c) = 38.7 K), there is a discontinuity in zero-field specific heat of 133 mJ mol(-1) K-1.
- The estimated electron-phonon coupling parameter, lambda = 0.62, may explain T(c) only if key phonon frequencies are relatively high compared to Theta, and low-temperature data suggest a secondary energy gap approximately
Article Abstract
Measurements of the specific heat of Mg11B2 from 1 to 50 K, in magnetic fields to 9 T, give the Debye temperature, Theta = 1050 K, the coefficient of the normal-state electron contribution, gamma(n) = 2.6 mJ mol(-1) K-2, and a discontinuity in the zero-field specific heat of 133 mJ mol(-1) K-1 at T(c) = 38.7 K. The estimated value of the electron-phonon coupling parameter, lambda = 0.62, could account for the observed T(c) only if the important phonon frequencies are unusually high relative to Theta. At low T, there is a strongly field-dependent feature that suggests the existence of a second energy gap, about 4 times smaller than the major gap.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.87.047001 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Aspartate aminotransferase-to-platelet ratio index as a novel predictor of early mortality in heat stroke patients: a multi-centre retrospective study.
Ann Med
December 2025
Department of Critical Care Medicine, the First Medical Centre, Chinese PLA General Hospital, Beijing, China.
Background: The aspartate aminotransferase-to-platelet ratio index (APRI) is an effective non-invasive marker for chronic liver dysfunction. Given that heat stroke patients often suffer from poor prognosis due to multi-organ involvement, with liver injury and coagulation dysfunction being of particular concern, this study aims to investigate whether APRI can comprehensively reflect liver injury and coagulation dysfunction in heat stroke patients and explore its relationship with 28-day mortality.
Methods: This retrospective study analysed electronic medical records from patients treated at 57 grade A tertiary hospitals in China from May 2005 to May 2024.
De novo variants in CDKL1 and CDKL2 are associated with neurodevelopmental symptoms.
Am J Hum Genet
March 2025
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA; Jan and Dan Duncan Neurological Research Institute, Texas Children's Hospital, Houston, TX, USA. Electronic address:
The CDKL (cyclin-dependent kinase-like) family consists of five members in humans, CDKL1-5, that encode serine-threonine kinases. The only member that has been associated with a Mendelian disorder is CDKL5, and variants in CDKL5 cause developmental and epileptic encephalopathy type 2 (DEE2). Here, we study four de novo variants in CDKL2 identified in five individuals, including three unrelated probands and monozygotic twins.
View Article and Find Full Text PDFMarine Heatwaves and Iceberg Melting in Polar Areas Intensify Phytoplankton Blooms.
Glob Chang Biol
March 2025
Carbon Neutrality Interdisciplinary Science Centre/Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin, China.
Climate change has led to increases in the intensity and frequency of marine heatwaves (MHWs). However, the impact of MHWs on phytoplankton at the global scale remains unclear. The metaheuristic superlearner proposed in this research indicates that the occurrence of MHWs weakens the Fe limitation of phytoplankton growth, leading to intensified phytoplankton blooms.
View Article and Find Full Text PDFThe Same Source of Microbes has a Divergent Assembly Trajectory Along a Hot Spring Flowing Path.
Mol Ecol
March 2025
CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences (CAS), Beijing, China.
Hot spring microbial mats represent intricate biofilms that establish self-sustaining ecosystems, hosting diverse microbial communities which facilitate a range of biochemical processes and contribute to the structural and functional complexity of these systems. While community structuring across mat depth has received substantial attention, mechanisms shaping horizontal spatial composition and functional structure of these communities remain understudied. Here, we explored the contributions of species source, local environment and species interaction to microbial community assembly processes in six microbial mat regions following a flow direction with a temperature decreasing from 73.
View Article and Find Full Text PDFGas-pressure-assisted strategy for precise control of palladium-based nanoparticle sizes: Unveiling size effects on methanol oxidation activity.
J Colloid Interface Sci
March 2025
Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Engineering, Hebei University of Technology. Tianjin 300401, China. Electronic address:
Understanding the relationship between catalyst particle size and activity is crucial for developing efficient catalytic systems. However, the size-dependent behavior of Pd-based alloy catalysts remains poorly understood, requiring a comprehensive investigation. This study presents a straightforward and effective gas-pressure-assisted heat-treatment method that allows precise control over the particle sizes of various Pd-based catalysts, including Pd, PdFe, PdCo, PdNi, and PdCu.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!