# Discovery of a superhard iron tetraboride superconductor.

@article{Gou2013DiscoveryOA,
title={Discovery of a superhard iron tetraboride superconductor.},
author={Huiyang Gou and N. Dubrovinskaia and E. Bykova and A. Tsirlin and D. Kasinathan and W. Schnelle and A. Richter and M. Merlini and M. Hanfland and A. Abakumov and D. Batuk and G. van Tendeloo and Y. Nakajima and A. Kolmogorov and L. Dubrovinsky},
journal={Physical review letters},
year={2013},
volume={111 15},
pages={
157002
}
}
Single crystals of novel orthorhombic (space group Pnnm) iron tetraboride FeB4 were synthesized at pressures above 8 GPa and high temperatures. Magnetic susceptibility and heat capacity measurements demonstrate bulk superconductivity below 2.9 K. The putative isotope effect on the superconducting critical temperature and the analysis of specific heat data indicate that the superconductivity in FeB4 is likely phonon mediated, which is rare for Fe-based superconductors. The discovered iron… Expand

#### Figures and Topics from this paper

Is Orthorhombic Iron Tetraboride Superhard
• Materials Science
• 2014
Abstract Millimeter-sized FeB4 bulks were synthesized under high pressure of 15 GPa and 1600 °C. Multiple analysis methodologies including XRD, SEM, TEM, and Raman spectroscopy verified this newExpand
Coexistence of Superconductivity and Superhardness in Beryllium Hexaboride Driven by Inherent Multicenter Bonding.
• Lailei Wu, +6 authors H. Mao
• Materials Science, Medicine
• The journal of physical chemistry letters
• 2016
The understanding of intrinsic multicenter-bonding mechanism and related properties demonstrated in the very example of BeB6 provides new insights for the design of tunable multifunctional materials. Expand
Revealing an unusual transparent phase of superhard iron tetraboride under high pressure
This study shows a hard superconducting material, iron tetraboride, transforms into a novel transparent phase under pressure, which is the first system in this class, to the authors' knowledge, and opens a new route to search for and design new transparent materials. Expand
Evolution of boron clusters in iron tetraborides under high pressure: semiconducting and ferromagnetic superhard materials
• 2015
We investigated the high-pressure structures and properties of iron tetraborides (FeB4) using a combination of an ab initio high-throughput search and a particle-swarm optimization algorithm forExpand
Elastic, magnetic and electronic properties of iridium phosphide Ir2P
Relatively low shear modulus of ~64 GPa from theoretical calculations suggests a complicated overall bonding in Ir2P with metallic, ionic, and covalent characteristics, indicated by magnetic susceptibility measurements. Expand
Superconductivity with high hardness in Mo3C2
Inserting light element atoms into a transition metal host matrix simultaneously produces high hardness and high superconductivity transition temperature. Here, we report the synthesis of aExpand
Crystal Field Splitting is Limiting the Stability and Strength of Ultra-incompressible Orthorhombic Transition Metal Tetraborides
The results shed a novel view on the origin of the stability and strength of orthorhombic TmB4, highlighting the importance of combinational analysis of a variety of parameters related to plastic deformation of the crystalline materials when attempting to design new ultra-incompressible, and potentially strong and hard solids. Expand
Superconductivity in the superhard boride WB4.2
We show that the superhard boride WB4.2 is a superconductor with a Tc of 2.05(5) K. Temperature-dependent magnetic susceptibility, electrical resistivity, and specific heat measurements were used toExpand
Pressure induced semiconductor-semimetal-superconductor transition of magnesium hexaborides.
By analysing the electronic structure, the intriguing semiconductor-semimetal-superconductor transition may be ascribed to the delocalization of more B-p electrons in the boron sublattice and the novel functions uncovered for MgB6 may inspire more efforts to discover materials with intriguing properties. Expand
Exploring high-pressure FeB2: Structural and electronic properties predictions
• Materials Science
• 2016
Abstract The high pressure (HP) structural phase of FeB 2 compound is investigated by using first-principles crystal structure prediction based on the CALYPSO technique. A thermodynamically stableExpand

#### References

SHOWING 1-10 OF 96 REFERENCES
Superconductivity in compressed iron: Role of spin fluctuations
• Physics
• 2001
The recent discovery of superconductivity in hexagonal iron under pressure poses a question about whether it is of conventional (phonon) or unconventional (magnetic) origin. We presentExpand
Superconductivity at 39 K in magnesium diboride
• Chemistry, Medicine
• Nature
• 2001
In the light of the tremendous progress that has been made in raising the transition temperature of the copper oxide superconductors (for a review, see ref. 1), it is natural to wonder how high theExpand
Mössbauer study of superconducting LaFe4P12
• Physics
• 1982
The ternary compound LaFe4P12 having a ’’filled skutterudite’’ structure is a superconductor with Tc = 4.08 K. We have used the Mossbauer effect of 57Fe to show that the magnetic moment of Fe inExpand
Superconductivity gets an iron boost
The recent discovery of iron-based superconductors was arguably the most important breakthrough in this field for more than two decades and may provide new avenues for understanding this high-temperature phenomenon. Expand
New superconducting and semiconducting Fe-B compounds predicted with an ab initio evolutionary search.
• Physics, Medicine
• Physical review letters
• 2010
New candidate ground states at 1:4, 1:2, and 1:1 compositions are identified in the well-known Fe-B system via a combination of ab initio high-throughput and evolutionary searches. We show that theExpand
Evidence for s-Wave Superconductivity with Antiferromagnetic Fluctuations in Filled Skutterudite LaFe4P12: 139La and 31P-NMR Studies
• Physics
• 2005
We have performed 139 La, 31 P-NMR studies on a filled skutterudite superconductor LaFe 4 P 12 with the critical temperature T c =4.1 K. In the normal state, the presence of antiferromagnetic (AFM)...
A single-crystal diffractometry investigation of scandium in -rhombohedral boron
Abstract The structure of a crystal of composition ScB∼28 has been investigated using single-crystal diffractometry. The space group is R 3 m and the hexagonal axes are a = 10.966 A and c = 24.088 A.Expand
Structural and electronic properties of the high-pressure hexagonal phases of Si
• Materials Science
• 1984
The pseudopotential method is used to examine the structural transitions of Si from $\ensuremath{\beta}$- Sn to simple hexagonal to hexagonal close packed. The calculated transition pressures,Expand
Structure refinements of iron borides Fe2B and FeB
• Chemistry
• 2006
Abstract Crystals of the iron borides FeB and Fe2B were obtained from two different high temperature synthesis routes, viz. in combined copper/gallium flux and under high pressure conditions. TheirExpand
Structure, bonding, and possible superhardness of CrB4
By electron and x-ray diffractionwe establish that the CrB4 compound discovered over 40 years ago crystallizes in the oP 10 (Pnnm) structure, in disagreement with previous experiments but inExpand