Superconductivity up to 29 K in SrFe(2)As(2) and BaFe(2)As(2) at high pressures.

J Phys Condens Matter

Department of Physics, University of Cambridge, Cavendish Laboratory, J J Thomson Avenue, Cambridge CB3 0HE, UK.

Published: January 2009

We report the discovery of superconductivity at high pressure in SrFe(2)As(2) and BaFe(2)As(2). The superconducting transition temperatures are up to 27 K in SrFe(2)As(2) and 29 K in BaFe(2)As(2), the highest obtained for materials with pressure-induced superconductivity thus far.

Download full-text PDF

Source
http://dx.doi.org/10.1088/0953-8984/21/1/012208DOI Listing

Publication Analysis

Top Keywords

srfe2as2 bafe2as2
8
superconductivity srfe2as2
4
bafe2as2 high
4
high pressures
4
pressures report
4
report discovery
4
discovery superconductivity
4
superconductivity high
4
high pressure
4
pressure srfe2as2
4

Similar Publications

Phase Formation of Iron-Based Superconductors during Mechanical Alloying.

Materials (Basel)

November 2022

V.L. Ginzburg Centre for High-Temperature Superconductivity and Quantum Materials, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53, Leninsky Ave., 119991 Moscow, Russia.

We successfully synthesized bulk BaNaFeAs and SrNaFeAs compounds by high-energy mechanical alloying (MA) technique. The MA process results in homogeneous amorphous phases of BaFeAs and SrFeAs. It was found that the optimum time for high-energy milling in all cases is about 1.

View Article and Find Full Text PDF

We investigate the effects of post-growth annealing on the structural and magnetic properties of BaFe2As2. Magnetic susceptibility measurements, which exhibit a signal corresponding to the magnetic phase transition, and high-resolution x-ray diffraction measurements, which directly probe the structural order parameter, show that annealing causes the ordering temperatures of both the phase transitions to increase, sharpen and converge. In the as grown sample, our measurements show two distinct transitions corresponding to structural and magnetic ordering, which are separated in temperature by approximately 1 K.

View Article and Find Full Text PDF

Annealing effects on the properties of BFe2As2 (B = Ca, Sr, Ba) superconducting parents.

Dalton Trans

October 2014

Materials Science & Technology Division, Oak Ridge National Laboratory, P. O. Box 2008, Building 4100, 1 Bethel Valley Road, Oak Ridge, TN 37831-6056, USA.

The effects of thermal-annealing on the antiferromagnetic (TN) and structural (Ts) transition temperatures of ThCr2Si2-type BaFe2As2 and SrFe2As2 ('122') crystals are reported and compared to that of CaFe2As2. Although the shift in transition temperature for CaFe2As2 can be as high as 75 K, we find modest changes of ∼6 K for BaFe2As2 and SrFe2As2. Such findings are based on the measurements of temperature dependence of electrical resistivity, magnetization, and heat capacity.

View Article and Find Full Text PDF

High pressure study of BaFe2As2--the role of hydrostaticity and uniaxial stress.

J Phys Condens Matter

February 2010

Department of Physics, Royal Holloway, University of London, Egham TW20 0EX, UK.

We investigate the evolution of the electrical resistivity of BaFe(2)As(2) single crystals with pressure. The samples used were from the same batch, grown using a self-flux method, and showed properties that were highly reproducible. Samples were pressurized using three different pressure media: pentane-isopentane (in a piston-cylinder cell), Daphne oil (in an alumina anvil cell) and steatite (in a Bridgman cell).

View Article and Find Full Text PDF

Measurement of the c-axis optical reflectance of AFe2As2 (A=Ba, Sr) single crystals: evidence of different mechanisms for the formation of two energy gaps.

Phys Rev Lett

August 2010

Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

We present the c-axis optical reflectance measurement on single crystals of BaFe2As2 and SrFe2As2, the parent compounds of FeAs based superconductors. Different from the ab-plane optical response where two distinct energy gaps were observed in the spin-density-wave (SDW) state, only the smaller energy gap could be seen clearly for E∥c axis. The very pronounced energy gap structure seen at a higher energy scale for E∥ab plane is almost invisible.

View Article and Find Full Text PDF

Want 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!