Antiferromagnetic transition in EuFe2As2: a possible parent compound for superconductors
نویسندگان
چکیده
Ternary iron arsenide EuFe2 As2 with ThCr2 Si2 -type structure has been studied by magnetic susceptibility, resistivity, thermopower, Hall, and specific-heat measurements. The compound undergoes two magnetic phase transitions at about 200 and 20 K, respectively. The former was found to be accompanied with a slight drop in magnetic susceptibility (after subtracting the Curie-Weiss paramagnetic contribution), a rapid decrease in resistivity, a large jump in thermopower, and a sharp peak in specific heat with decreasing temperature, all of which point to a spin-density-wave-like antiferromagnetic transition. The latter was proposed to be associated with an A -type antiferromagnetic ordering of Eu2+ moments. Comparing with the physical properties of the isostructural compounds BaFe2 As2 and SrFe2 As2, we expect that superconductivity could be induced in EuFe2 As2 through appropriate doping.
منابع مشابه
Metamagnetic transition in EuFe2As2 single crystals
We report the measurements of anisotropic magnetization and magnetoresistance on single crystals of EuFe2As2, a parent compound of ferro-arsenide hightemperature superconductor. Apart from the antiferromagnetic (AFM) spin-densitywave transition at 186 K associated with Fe moments, the compound undergoes another magnetic phase transition at 19 K due to AFM ordering of Eu spins (J = S = 7/2). The...
متن کاملPressure-decoupled magnetic and structural transitions of the parent compound of iron-based 122 superconductors BaFe2As2.
The recent discovery of iron ferropnictide superconductors has received intensive concern in connection with magnetically involved superconductors. Prominent features of ferropnictide superconductors are becoming apparent: the parent compounds exhibit an antiferromagnetic ordered spin density wave (SDW) state, the magnetic-phase transition is always accompanied by a crystal structural transitio...
متن کاملPhase diagram and electronic indication of high-temperature superconductivity at 65 K in single-layer FeSe films.
The recent discovery of possible high-temperature superconductivity in single-layer FeSe films has generated significant experimental and theoretical interest. In both the cuprate and the iron-based high-temperature superconductors, superconductivity is induced by doping charge carriers into the parent compound to suppress the antiferromagnetic state. It is therefore important to establish whet...
متن کاملMott transition in modulated lattices and parent insulator of (K,Tl)(y)Fe(x)Se(2) superconductors.
The degree of electron correlations remains a central issue in the iron-based superconductors. The parent iron pnictides are antiferromagnetic, and their bad-metal behavior has been interpreted in terms of proximity to a Mott transition. We study such a transition in multiorbital models on modulated lattices containing an ordered pattern of iron vacancies, using a slave-rotor method. We show th...
متن کاملElectronic evidence of an insulator-superconductor crossover in single-layer FeSe/SrTiO3 films.
In high-temperature cuprate superconductors, it is now generally agreed that superconductivity is realized by doping an antiferromagnetic Mott (charge transfer) insulator. The doping-induced insulator-to-superconductor transition has been widely observed in cuprates, which provides important information for understanding the superconductivity mechanism. In the iron-based superconductors, howeve...
متن کامل