An investigation of binary system Fe-Se

Jain, Bina; Singh, A. K.; Chandra, K.

doi:10.1088/0305-4608/8/12/021

Cited by 19 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Samples quenched from above 455 °C contain significant fractions of three-phases (not possible for equilibrium conditions in a binary system). This is consistent with the proposal in the old literature that iron-rich, hexagonal δ-FeSe, stable at high temperatures, converts to tetragonal FeSe on cooling 8 . Thus we assign 455 °C as the upper limit of temperature stability for β-FeSe.…”

Section: Resultssupporting

confidence: 93%

See 1 more Smart Citation

Extreme sensitivity of superconductivity to stoichiometry inFe1+δSe

et al. 2009

View full text Add to dashboard Cite

The recently discovered iron arsenide superconductors appear to display a universal set of characteristic features, including proximity to a magnetically ordered state and robustness of the superconductivity in the presence of disorder. Here we show that superconductivity in Fe 1+␦ Se, which can be considered the parent compound of the superconducting arsenide family, is destroyed by very small changes in stoichiometry. Further, we show that nonsuperconducting Fe 1+␦ Se is not magnetically ordered down to 5 K. These results suggest that robust superconductivity and immediate instability against an ordered magnetic state should not be considered as intrinsic characteristics of iron-based superconducting systems.

show abstract

Section: Resultssupporting

confidence: 93%

“…This is consistent with the proposal in the old literature that iron-rich hexagonal ␦-FeSe, stable at high temperatures, converts to tetragonal FeSe on cooling. 8 Thus we assign 455°C as the upper limit of temperature stability for ␤-FeSe. This agrees well with the reported decomposition temperature of 457°C.…”

Section: Resultsmentioning

confidence: 99%

Extreme sensitivity of superconductivity to stoichiometry inFe1+δSe

et al. 2009

View full text Add to dashboard Cite

show abstract

“…According to the phase diagram assessed by Okamoto [6], tetragonal FeSe is stable up to 457 °C and decomposes peritectically into α-Fe and hexagonal FeSe above this temperature. Since the reaction temperature was lower than this transition point, it is unlikely that the tetragonal FeSe has formed by reaction between α-Fe and hexagonal FeSe during cooling, as it is the case in processes involving reaction at T > 457 °C [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Methodsmentioning

confidence: 99%

“…So far, most reported preparation conditions involve sealing in evacuated quartz ampoules, heating most often well above the temperature, below which tetragonal FeSe is stable, followed or not by annealing at 300 °C ≤ T ≤ 460 °C [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In some cases, several heat treatments are performed, requiring re-sealing in new evacuated ampoules [14][15][16][17][18][19][20][21][22]. Although this processing route usually results in good samples, it is time and resources consuming, because the silica tubes are generally broken and disposed of at the end of each heat treatment, and thus not optimized for potential large-scale production.…”

Section: Introductionmentioning

confidence: 99%

A simple method for preparing superconducting FeSe pellets without sealing in evacuated silica tubes

Grivel

2017

Ceramics International

View full text Add to dashboard Cite

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

show abstract

“…Iron-based superconductors belong to pnictides or chalcogenides and these compounds have been already investigated in the past [3][4][5]. The simplest superconductor of this class belongs to the iron-selenium system, as it is simple binary system [6].…”

Section: Introductionmentioning

confidence: 99%

Mössbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe

Błachowski

Ruebenbauer

Żukrowski

et al. 2010

Journal of Alloys and Compounds

View full text Add to dashboard Cite

a b s t r a c tSuperconducting FeSe has been investigated by measurements of the magnetic susceptibility versus temperature and Mössbauer spectroscopy at various temperatures including strong external magnetic fields applied to the absorber. It was found that isomer shift exhibits sharply defined increase at about 105 K leading to the lowering of the electron density on iron nucleus by 0.02 electron a.u. −3 . Above jump in the electron density is correlated with the transition from the P4/nmm to the Cmma structure, while decreasing temperature. Mössbauer measurements in the external magnetic field and for temperatures below transition to the superconducting state revealed null magnetic moment on iron atoms. Hence, the compound exhibits either Pauli paramagnetism or diamagnetic behavior. The principal component of the electric field gradient on the iron nucleus was found as negative on the iron site.

show abstract

An investigation of binary system Fe-Se

Cited by 19 publications

References 11 publications

Extreme sensitivity of superconductivity to stoichiometry inFe1+δSe

Extreme sensitivity of superconductivity to stoichiometry inFe1+δSe

A simple method for preparing superconducting FeSe pellets without sealing in evacuated silica tubes

Mössbauer spectroscopy evidence for the lack of iron magnetic moment in superconducting FeSe

Contact Info

Product

Resources

About