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.
-end-
[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).

Link: http://engine.scichina.com/publisher/scp/journal/SCPMA/specialTopics/postArticles/xs32kY3qrqHTLGR2r

Science China Press

Related Superconductivity Articles:

Looking at light to explore superconductivity in boron-diamond films
More than a decade ago, researchers discovered that when they added boron to the carbon structure of diamond, the combination was superconductive.
Discovery in new material raises questions about theoretical models of superconductivity
The US Department of Energy's Ames Laboratory has successfully created the first pure, single-crystal sample of a new iron arsenide superconductor, CaKFe4As4, and studies of this material have called into question some long-standing theoretical models of superconductivity.
Superconductivity with two-fold symmetry -- new evidence for topological superconductor SrxBi2Se3
Topological superconductivity is the quantum condensate of paired electrons with an odd parity of the pairing function.
Portable superconductivity systems for small motors
Superconductivity is one of modern physics' most intriguing scientific discoveries.
Graphene's sleeping superconductivity awakens
The intrinsic ability of graphene to superconduct (or carry an electrical current with no resistance) has been activated for the first time.
Superconductivity of pure Bismuth crystal at 0.00053 K
Scientists at TIFR Mumbai have discovered superconductivity of pure Bismuth crystal.
When crystal vibrations' inner clock drives superconductivity
Superconductivity is like an Eldorado for electrons, as they flow without resistance through a conductor.
Physicists induce superconductivity in non-superconducting materials
Researchers at the University of Houston have reported a new method for inducing superconductivity in non-superconducting materials, demonstrating a concept proposed decades ago but never proven.
A new spin on superconductivity
Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have made a discovery that could lay the foundation for quantum superconducting devices.
Superconductivity: After the scenario, the staging
Superconductivity with a high Tc continues to present a theoretical mystery.

Related Superconductivity Reading:

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

Jumpstarting Creativity
Our greatest breakthroughs and triumphs have one thing in common: creativity. But how do you ignite it? And how do you rekindle it? This hour, TED speakers explore ideas on jumpstarting creativity. Guests include economist Tim Harford, producer Helen Marriage, artificial intelligence researcher Steve Engels, and behavioral scientist Marily Oppezzo.
Now Playing: Science for the People

#524 The Human Network
What does a network of humans look like and how does it work? How does information spread? How do decisions and opinions spread? What gets distorted as it moves through the network and why? This week we dig into the ins and outs of human networks with Matthew Jackson, Professor of Economics at Stanford University and author of the book "The Human Network: How Your Social Position Determines Your Power, Beliefs, and Behaviours".