Nav: Home

Special topic: Superconductivity and magnetism in transition-metal compounds

November 28, 2018

Transition metals contain d-orbital electrons which quite often exhibit the duality of magnetism and superconductivity in compounds. Up to date, enormous interesting physics has emerged in this field and material class, such as high temperature superconductivity in copper oxides and iron pnictides/chalcogenides, chromium arsenides, etc. The relationship between superconductivity and magnetism is very essential to understand the unconventional superconductivity.

SCIENCE CHINA Physics Mechanics Astronomy recently publishes a topical issue, in which eight articles are collected to touch some of the frontier studies of this field.

First, Bhattacharyya, Adroja, et al. [1] from ISIS in UK present a brief review on two typical unconventional superconducting systems, namely the Fe- and Cr-based superconductors based on the ?SR measurements. This seems to be a very good review and goes really to some deep insight of the superconducting gap structures and tells the role played by the antiferromagnetic spin fluctuations.

Then two pieces of work concerning the recent progresses in cuprate superconductors are collected. The first piece of them comes from ARPES studies by Hong Ding's group [2] of IOP, CAS, China, which reports the determination of the band parameters of cuprate superconductor Bi-2212 with systematic and wide doping level. The second one arises from the scanning tunneling spectroscopy studies in Bi-2212 and Bi-2201 done by the group of Yi Yin [3] in Zhejiang University, China. They focus on effects of oxygen dopants at different positions on the local electronic properties in two types of Bi-based cuprate families.

For iron based superconductors, three pieces of work are presented. The first one is finished by the group of Guanghan Cao [4] in Zhejiang University, China, which targets the coexistence of superconductivity and possible ferromagnetism in Eu(Fe0.96Ni0.04)As2. This material provides a complementary playground for the study of the interplay between SC and magnetism. The second piece of work is done by the group of Zhixiang Shi [5] in Southeast University, China, which attacks the vortex problem of a recently discovered iron based 112-type superconductor. They explores the basic parameters concerning vortex dynamics and the vortex phase diagram of that system. The third piece of work is given by Gang Mu's group [6] from SIMIT, CAS, China. They have grown high quality single crystal of CaFeAsF and worked on the high field resistive measurements. An insulator-metal transition is observed upon applying a high magnetic field, and through the scaling analysis, they conclude a quantum phase transition in this material tuned by magnetic field.

Finally, two papers about the exploration of new superconductors or correlated materials are collected. First work is done by the group of Jianlin Luo [7] in IOP, CAS, China. They report the growth of a new type of FeAs based crystals Ce12Fe57.5As41 and La12Fe57.5As41 and the discovery of multiple magnetic transitions in these correlated materials. The second piece of work comes also from the group of IOP, CAS, China, led by Zhian Ren [8]. They report the discovery of superconductivity in LaPd2Bi2.

All works collected in this topical issue strongly suggest that the d-orbital electrons in related compounds really illustrate rich physics about electron localization and itinerancy, which intimately leads to the emergence of cooperative interactions and phenomena.
[1] A. Bhattacharyya, D. T. Adroja, M. Smidman, and V. K. Anand, Sci. China-Phys. Mech. Astron. 61, 127402 (2018).

[2] Y. G. Zhong, Y. M. Chen, J. Y. Guan, J. Zhao, Z. C. Rao, C. Y. Tang, H. J. Liu, Y. J. Sun, H. Ding, Sci. China-Phys. Mech. Astron. 61, 127403 (2018).

[3] Y. Fei, K. L. Bu, W. H. Zhang, Y. Zheng, X. Sun, Y. Ding, X. J. Zhou, and Y. Yin, Sci. China-Phys. Mech. Astron. 61, 127404 (2018).

[4] Y.-B. Liu, Y. Liu, W.-H. Jiao, Z. Ren, and G.-H. Cao, Sci. China-Phys. Mech. Astron. 61, 127405 (2018).

[5] X. Z. Xing, Z. F. Li, X. L. Yi, J. J. Feng, C. Q. Xu, N. Zhou, Y. Meng, Y. F. Zhang, Y. Q. Pan, L. Y. Qin, W. Zhou, H.J. Zhao, and Z. X. Shi, Sci. China-Phys. Mech. Astron. 61, 127406 (2018).

[6] Y. H. Ma, G. Mu, T. Hu, Z. W. Zhu, Z. J. Li, W. Li, Q. C. Ji, X. Zhang, L. L. Wang, and X. M. Xie, Sci. China-Phys. Mech. Astron. 61, 127408 (2018).

[7] W. Wu, and J. L. Luo, Sci. China-Phys. Mech. Astron. 61, 127407 (2018).

[8] Q. G. Mu, B. J. Pan, B. B. Ruan, T. Liu, K. Zhao, L. Shan, G. F. Chen, and Z. A. Ren, Sci. China-Phys. Mech. Astron. 61, 127409 (2018).


Science China Press

Related Superconductivity Articles:

First report of superconductivity in a nickel oxide material
Scientists at SLAC and Stanford have made the first nickel oxide material that shows clear signs of superconductivity - the ability to transmit electrical current with no loss.
A hallmark of superconductivity, beyond superconductivity itself
Physicists have found 'electron pairing,' a hallmark feature of superconductivity, at temperatures and energies well above the critical threshold where superconductivity occurs.
Manipulating superconductivity using a 'mechanic' and an 'electrician'
Strongly correlated materials can change their resistivity from infinity to zero with minute changes in conditions.
Triplet superconductivity demonstrated under high pressure
Researchers in France and Japan have demonstrated a theoretical type of unconventional superconductivity in a uranium-based material, according to a study published in the journal Physical Review Letters.
The mechanism of high-temperature superconductivity is found
Russian physicist Viktor Lakhno from Keldysh Institute of Applied Mathematics, RAS considers symmetrical bipolarons as a basis of high-temperature superconductivity.
More Superconductivity News and Superconductivity Current Events

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Erasing The Stigma
Many of us either cope with mental illness or know someone who does. But we still have a hard time talking about it. This hour, TED speakers explore ways to push past — and even erase — the stigma. Guests include musician and comedian Jordan Raskopoulos, neuroscientist and psychiatrist Thomas Insel, psychiatrist Dixon Chibanda, anxiety and depression researcher Olivia Remes, and entrepreneur Sangu Delle.
Now Playing: Science for the People

#537 Science Journalism, Hold the Hype
Everyone's seen a piece of science getting over-exaggerated in the media. Most people would be quick to blame journalists and big media for getting in wrong. In many cases, you'd be right. But there's other sources of hype in science journalism. and one of them can be found in the humble, and little-known press release. We're talking with Chris Chambers about doing science about science journalism, and where the hype creeps in. Related links: The association between exaggeration in health related science news and academic press releases: retrospective observational study Claims of causality in health news: a randomised trial This...