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16 papers · 1 filter
Intrinsic ferromagnetic impurity phases in SmFeAsO1-xFx detected by muSR
S. Sanna, R. De Renzi, G. Lamura +6
We report about muSR measurements on SmFeAsO1-xFx which helped us to identify the signature of diluted ferromagnetic inclusions, ubiquitous in the iron pnictides. These impurities…
Two energy gaps and Fermi surface 'arcs' in NbSe2
S. V. Borisenko, A. A. Kordyuk, V. B. Zabolotnyy +9
Using angle-resolved photoemission spectroscopy (ARPES), we report on the direct observation of the energy gap in 2H-NbSe2 caused by the charge-density waves (CDW). The gap opens i…
Interplay of Rare Earth and Iron magnetism in RFeAsO with R = La, Ce, Pr, and Sm: A muon spin relaxation study and symmetry analysis
H. Maeter, H. Luetkens, Yu. G. Pashkevich +11
We report zero field muon spin relaxation (muSR) measurements on RFeAsO with R = La, Ce, Pr, and Sm. We study the interaction of the FeAs and R (rare earth) electronic systems in t…
Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2 - parent compound for an iron arsenic high temperature superconductor
Chang Liu, Takeshi Kondo, Ni Ni +9
We use angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of CaFe2As2 - parent compound of a pnictide superconductor. We find that the structural…
Momentum-resolved superconducting gap in the bulk of BaKFeAs from combined ARPES and SR measurements
D. V. Evtushinsky, D. S. Inosov, V. B. Zabolotnyy +15
Here we present a calculation of the temperature-dependent London penetration depth, , in BaKFeAs (BKFA) on the basis of the electronic band structure […
Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
Takeshi Kondo, Rustem Khasanov, Tsunehiro Takeuchi +2
A pairing gap and coherence are the two hallmarks of superconductivity. In a classical BCS superconductor they are established simultaneously at Tc. In the cuprates, however, an en…