R. Beck

We investigated magnetic vortices in two stoichiometric LiFeAs samples by means of scanning tunneling microscopy and spectroscopy. The vortices were revealed by measuring the local…

cond-mat.supr-con2016★ 6 cited

Defect states in LiFeAs as seen by low temperature scanning tunneling microscopy and spectroscopy

R. Schlegel, P. K. Nag, D. Baumann +4

We present a microscopic investigation of frequently observed impurity-induced states in stoichiometric LiFeAs using low temperature scanning tunneling microscopy and spectroscopy…

cond-mat.supr-con2016★ 4 cited

Combined resistivity and Hall effect study on NaFe $_{1 - x}$ Rh $_{x}$ As single crystals

Frank Steckel, Robert Beck, Maria Roslova +5

Electrical transport measurements are used to study the Rh-doped NaFeAs superconductor series with a focus on the tetragonal phase. The resistivity curvature has an anomalous tempe…

cond-mat.supr-con2015★ 19 cited

Unusual temperature evolution of superconductivity in LiFeAs

P. K. Nag, R. Schlegel, D. Baumann +5

We have performed temperature dependent tunneling spectroscopy on an impurity-free surface area of a LiFeAs single crystal. Our data reveal a highly unusual temperature evolution o…

cond-mat.supr-con2015★ 21 cited

Crystal growth and the electronic phase diagram of the 4 $d$ doped Na $_{1 - δ}$ Fe $_{1 - x}$ Rh $_{x}$ As in comparison with 3 $d$ doped Na $_{1 - δ}$ Fe $_{1 - x}$ Co $_{x}$ As

Frank Steckel, Maria Roslova, Robert Beck +13

Single crystals of Na $_{1 - δ}$ Fe $_{1 - x}$ T $_{x}$ As with T = Co, Rh have been grown using a self-flux technique. The crystals were thoroughly characterized by powder X-ray diffraction,…

cond-mat.supr-con2014★ 14 cited

Anomalous High-Energy Electronic Interaction in Iron-Based Superconductor

D. V. Evtushinsky, A. N. Yaresko, V. B. Zabolotnyy +11

Strong electron interactions in solids increase effective mass, and shrink the electronic bands [1]. One of the most unique and robust experimental facts about iron-based supercond…

cond-mat.supr-con2003★ 17 cited

Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-δfilms:k-selectivity and the shape of the superconductor

A. Sharoni, G. Leibovitch, A. Kohen +4

Tunneling spectroscopy of epitaxial (100) oriented \chem{YBa_2Cu_3O_{7-δ}} films was performed using an STM at 4.2 K. On atomically smooth areas, tunneling spectra revealing clear…

Absence of hexagonal to square structural transition in LiFeAs vortex matter