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Ultrasound Evidence for a Low-Temperature Anomaly Inside the Superconducting State of 4Hb-TaS
Yongwei Li, Dmitri V. Efremov, Paul Leask +7
We report low-temperature ultrasound measurements on single crystals of the layered van der Waals superconductor 4Hb-TaS. Specific heat and ac magnetic susceptibility show a sh…
Electron-doping dependence of the anisotropic superconductivity in BaFeNiAs
Zhaosheng Wang, Tao Xie, E. Kampert +8
The upper critical field () in superconducting BaFeNiAs single crystals has been determined by magnetotransport measurements down to 0.6 K over the whole…
Optical Conductivity Evidence of Clean-Limit Superconductivity in LiFeAs
R. P. S. M. Lobo, G. Chanda, A. V. Pronin +4
We measured the optical conductivity of superconducting LiFeAs. In the superconducting state, the formation of the condensate leads to a spectral-weight loss and yields a penetrati…
Optical study of superconducting PrCuO with
G. Chanda, R. P. S. M. Lobo, E. Schachinger +3
Superconducting PrCuO, (PCO) films with structure and a of 27 K have been investigated by various optical methods in a wide frequency (7 - 5500…
Optical study of superconducting Ga-rich layers in silicon
T. Fischer, A. V. Pronin, R. Skrotzki +6
We performed phase-sensitive terahertz (0.12 - 1.2 THz) transmission measurements of Ga-enriched layers in silicon. Below the superconducting transition, T_{c} = 6.7 K, we find cle…
Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
F. Weickert, M. Nicklas, W. Schnelle +3
We present the first study of codoped iron-arsenide superconductors of the 122 family (Sr/Ba)_(1-x)K_xFe_(2-y)Co_yAs_2 with the purpose to increase the upper critical field H_c2 co…
Upper critical magnetic field in Ba_0.68K_0.32Fe_2As_2 and Ba(Fe_0.93Co_0.07)_2As_2
V. A. Gasparov, L. Drigo, A. Audouard +6
We report measurements of the temperature dependence of the radio-frequency magnetic penetration depth in Ba_0.68K_0.32Fe_2As_2 and Ba(Fe_0.93Co_0.07)_2As_2 single crystals in puls…
Damping of dHvA oscillations and vortex-lattice disorder in the peak-effect region of strong type-II superconductors
A. Maniv, T. Maniv, V. Zhuravlev +6
The phenomenon of magnetic quantum oscillations in the superconducting state poses several questions that still defy satisfactory answers. A key controversial issue concerns the ad…