2016 Impact factor 1.461
Condensed Matter and Complex Systems

News / Highlights / Colloquia

EPJ B Highlight - Silver Sheds Light On Superconductor Secrets

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The resistivity for Bi4-xAgxO4S3 (0≤x≤0.2) as a function of temperature. © S. G. Tan et al.

By doping a bismuth-based layered material with silver, Chinese scientists demonstrated that superconductivity is intrinsic to the new material rather than stemming from its impurities

The first report on the chemical substitution, or doping, using silver atoms, for a new class of superconductor that was only discovered this year, has just been published in EPJ B. Chinese scientists from Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, discovered that the superconductivity is intrinsic rather than created by impurities in this material with a sandwich-style layered structure made of bismuth oxysulphide (Bi4O4S3).

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EPJ B Highlight - Persistent sync for neurons

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Recorded neuron firing spikes as function of time. © B. B. M. Silva et al.

Under the scrutiny of mathematical tools designed to study complex networks, rats’ neurons reveal steady neural network coordination regardless of the animals’ behaviour

A team of Brazilian physicists working with neuroscientists studying freely behaving rats have found that their neurons often act in precise coordination over time, in a study just published in EPJ B. These findings stem from the work of Bruno Silva, a researcher at Bahia Federal University in Salvador, and his colleagues from other universities in the Northeastern region of Brazil, and suggest that neuronal networks’ memory could be explored in the future.

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EPJ B Highlight - Graphene mini-lab

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Electron diffusion influenced by electric field potential (in blue) in graphene. © A. Pototsky et al.

Physicists study fast-moving electrons in graphene as a model laboratory for massless particles

A team of physicists from Europe and South Africa showed that electrons moving randomly in graphene can mimic the dynamics of particles such as cosmic rays, despite travelling at a fraction of their speed, in a paper just published in EPJ B.

Andrey Pototsky and colleagues made use of their knowledge of graphene, which is made of a carbon layer, one atom thick, and packed in a honeycomb lattice pattern. In such material the interaction of electrons with atoms changes the effective mass of the electrons. As a result, the energy of electrons in graphene becomes similar to the photon energy.

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EPJ B Highlight - Cocktail achieves superconducting boost

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Superconductivity occurs at 44k. © E.-W. Scheidt, et al.

Scientists have now developed a high-performance material by mixing iron and selenium

Physicists describe how they have synthesized a new material that belongs to the iron-selenide class of superconductors, called LixFe2Se2(NH3)y, in a paper just published in EPJ B. The work was carried out by Ernst-Wilhelm Scheidt from the University of Augsburg and colleagues. This material displays promising superconducting transition temperatures of 44 Kelvins (K) at ambient pressure, thus improving upon traditional copper-based high-temperature superconductors.

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EPJ B Colloquium - Heat flux anomaly at nanoscale

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Nanomaterials are promising platforms for testing fundamental heat transport theories, according to a recent review outlining anomalous heat transport in nanometric scale materials.

The latest developments in experimental, theoretical and numerical studies of heat conduction have recently been published in EPJB. A review article by Singaporean and Chinese experts indicates that the standard laws governing conduction at macroscopic scale no longer apply in nanostructures. Instead, thermal conductivity is dependent on the material scale. Heat transport in nanoscale materials has implications in electronic, optoelectronic, and thermal devices.

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EPJ B Highlight - Angling for gold

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Unravelling gold’s bonding mysteries / © Mike Boulden

A new model provides an alternative description of atomic level gold bonding.

A study on how gold atoms bond to other atoms using a model that takes into account bonds direction has been carried out by physicist Marie Backman from the University of Helsinki, Finland, and colleagues. These findings, which have just been published in EPJB, are a first step toward better understanding how gold binds to other materials through strong, so-called covalent, bonds.

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EPJ B Colloquium - Statistical physics for micro-scale fracture and plasticity

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A review of recent successes and outstanding challenges for statistical physicists working on the mechanical properties of materials.

Most of the complexity in fracture and plasticity stems from the interplay between long-range elastic interactions and structural disorder. Statistical physicists have developed a full machinery of analytical and numerical methods to tackle these problems. Concepts drawn from percolation, fractal geometry, phase-transitions and interface depinning have been used, with varying degrees of success, to understand these problems. In this EPJB colloquium, Stefano Zapperi highlights

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EPJ B News – Topical issue on GW Calculations for Complex Systems

The GW method is emerging as a conceptual and computational platform for developing increasingly more accurate descriptions of electronic excitations. Guest editors Feliciano Giustino, Paolo Umari and Angel Rubio hope that the new EPJB topical issue on the Challenges and Solutions in GW Calculations for Complex Systems will provide an exciting perspective on the state-of-the-art in this fascinating research area, and encourage new developments in view of addressing the widest range of materials. The papers in this topical issue will be free to access through the end of November 2012.

EPJ B - Noise down, neuron signals up

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Nervecell Cluster v02 01 © Sebastian Schreiter / Springer Verlag GmbH

A new model of background noise present in the nervous system could help better understand neuronal signalling delay in response to a stimulus.

Biomedical engineer Muhammet Uzuntarla from Bulent Ecevit University, Turkey, and his colleagues present a biologically accurate model of the underlying noise which is present in the nervous system. The article has just been published in EPJB. This work has implications for explaining how noise, modulated by unreliable synaptic transmission, induces a delay in the response of neurons to external stimuli as part of the neurons coding mechanism.

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EPJ B - Banks’ cash stash: no shield against bankruptcy

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Imposing minimal capital levels for banks is like attempting to solve a complex jigsaw puzzle with a poorly fitting piece that could lead to even greater chaos.

According to theoretical physicists João da Cruz and Pedro Lind from Lisbon University, Portugal, imposing minimum capital levels for banks may not prevent the insolvency of a minority of banks from triggering a widespread banking system collapse. In a study just published in EPJB, the researchers explain why this measure could instead lead to larger crises.

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Acting EiC: Heiko Rieger

Executive Editors:
Eduardo Hernandez, Heiko Rieger, Bikas K. Chakrabarti, Wenhui Duan
I am naturally indebted to you and the referees who contributed to this success with your time and constructive advice.

Hamid Assadi

ISSN (Print Edition): 1434-6028
ISSN (Electronic Edition): 1434-6036

© EDP Sciences, Società Italiana di Fisica and Springer-Verlag

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