Superconducting EuFe2(As0.82P0.18)2 single crystals are investigated by
infrared spectroscopy in a wide frequency range. Below Tc=28K a superconducting
gap forms at 2\Delta_{0} = 9.5 meV = 3.8 k_B T_c causing the reflectivity to
sharply rise to unity at low frequency. In the range of the gap the optical
conductivity can be perfectly described by BCS theory with an $s$-wave gap and
no nodes. From our analysis of the temperature dependent conductivity and
spectral weight at T>T_c, we deduce an increased interband coupling between
hole- and electron-sheets on the Fermi surface when $T$ approaches T_c

Chanda, G.

Dressel, M.

Gegenwart, P.

Jeevan, H. S.

Wu, D.

English

arXiv

D. Wu

G. Chanda

H. S. Jeevan

P. Gegenwart

M. Dressel

Crossref

Physical Review B

Optical investigations of chemically pressurized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">EuFe</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>: An<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:math>-wave superconductor with strong interband interactions

Superconducting EuFe2(As0.82P0.18)(2) single crystals are investigated by broad-band infrared spectroscopy. Below T-c = 28 K, a superconducting gap forms at 2 Delta(0) = 9.5 meV = 3.7k(B)T(c), causing the reflectivity to sharply rise to unity at low frequency. In the range of the gap, the optical conductivity can be perfectly described by BCS theory with an s-wave gap and no nodes. From our analysis of the temperature-dependent conductivity and spectral weight at T > T-c, we deduce an increased interband coupling between hole and electron sheets on the Fermi surface when T approaches T-c.Alexander von Humboldt Foundation; DFG [SPP1458

Jeevan, Hirale S.

Gegenwart, Philipp

Dressel, Martin

GRO.publications (Univ. Göttingen)

Optical investigations of chemically pressurized EuFe2(As1-xPx)(2): An s-wave superconductor with strong interband interactions

OPUS Augsburg

Optical investigations of chemically pressurized EuFe2(As1−xPx)2: an s-wave superconductor with strong interband interactions