2.5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- ETH ZurichCH630 papers
- Paul Scherrer InstituteCH136 papers
- École Polytechnique Fédérale de LausanneCH61 papers
- University of ZurichCH45 papers
- University of RegensburgDE44 papers
- Institute of PhysicsPL39 papers
- Centre National de la Recherche ScientifiqueFR37 papers
- Swiss Light Source37 papers
- Polish Academy of SciencesPL36 papers
- P.L. Kapitza Institute for Physical ProblemsRU26 papers
- National Institute for Materials ScienceJP25 papers
- University of GenevaCH23 papers
20 papers · 1 filter
Electrometry on charge traps with a single-electron transistor
Miha Furlan, Sergey V. Lotkhov
Background charge fluctuators are studied individually by means of a modified single-electron pump. Operation of the device in a feedback mode allows electrometric sensing of the c…
On the equilibrium magnetization of high-Tc superconductors below the irreversibility line
I. L. Landau, H. R. Ott
By scaling isothermal magnetization data measured at different temperatures in the mixed state of high-Tc superconductors, we show that in some cases the sample magnetization, meas…
Anisotropy of the superconducting state properties and phase diagram of MgB2 by torque magnetometry on single crystals
M. Angst, R. Puzniak, A. Wisniewski +6
The angular and temperature dependence of the upper critical field Hc2 in MgB2 was determined from torque magnetometry measurements on single crystals. The Hc2 anisotropy gamma_H w…
A low-dimensional spin S = 1/2 system at the quantum critical limit: Na2V2O7
J. L. Gavilano, D. Rau, S. Mushkolaj +3
We report the results of measurements of the dc-susceptibility and the 23Na-NMR response of Na2V2O7, a recently synthesized, non metallic low dimensional spin system. Our results i…
Independent determination of the two gaps by directional point-contact spectroscopy in MgB_2 single crystals
R. S. Gonnelli, D. Daghero, G. A. Ummarino +4
Directional point-contact spectroscopy measurements were performed for the first time in state-of-the-art MgB_2 single crystals. The selective suppression of the superconductivity…
Temperature dependence of the upper critical field of high-Tc superconductors from isothermal magnetization data. Application to polycrystalline samples and ceramics
I. L. Landau, H. R. Ott
Using a recently developed scaling procedure that allows to establish the temperature dependence of the normalized upper critical field from measurements of the equilibrium isother…
Phonon dispersion and lifetimes in MgB2
Abhay Shukla, Matteo Calandra, Matteo d'Astuto +9
We measure phonon dispersion and linewidth in a single crystal of MgB_2 along the Gamma-A, Gamma-M and A-L directions using inelastic X-Ray scattering. We use Density Functional Th…
Direct evidence for two-band superconductivity in MgB_2 single crystals from directional point-contact spectroscopy in magnetic fields
R. S. Gonnelli, D. Daghero, G. A. Ummarino +4
We present the results of the first directional point-contact spectroscopy experiments in high-quality MgB_2 single crystals. Due to the directionality of the current injection int…
Phase transition of the Si(111)-4x1-In surface reconstruction investigated by electron transport measurements
Takashi Uchihashi, Urs Ramsperger
We measure the electron conductivity of the surface states and the subsurface space charge layer originating from the Si(111)-4x1-In reconstruction as a function of temperature. Th…
MgB2 single crystals: high pressure growth and anisotropic properties
J. Karpinski, M. Angst, J. Jun +11
Single crystals of MgB2 with a size up to 1.5x0.9x0.2 mm3 have been grown with a high pressure cubic anvil technique. The crystal growth process is very peculiar and involves an in…
Holstein polarons in a strong electric field: delocalized and stretched states
Wei Zhang, Alexander O. Govorov, Sergio E. Ulloa
The coherent dynamics of a Holstein polaron in strong electric fields is considered under different regimes. Using analytical and numerical analysis, we show that even for small ho…
Comment on "Superconducting anisotropy and evidence for intrinsic pinning in single crystalline MgB2"
M. Angst, R. Puzniak, A. Wisniewski +3
In a recent paper [Phys. Rev. B 66, 012501 (2002)], torque data measured on a MgB2 single crystal in fields from 10 to 60 kOe at 10 K were presented. The authors obtained the aniso…
Temperature dependence of the upper critical field of type-II superconductors from isothermal magnetization data. Application to high temperature superconductors
I. L. Landau, H. R. Ott
Using the Ginzburg-Landau theory in very general terms, we develop a simple scaling procedure which allows to establish the temperature dependence of the upper critical field and t…
Magneto-optical reflectivity of superconducting MgB2 single crystals
A. Perucchi, L. Degiorgi, J. Jun +2
We present magneto-optical reflectivity results in the basal-plane of the hexagonal . The data were collected on a mosaic of single crystals with from…
Super-conducting critical fields and anisotropy of a MgB2 single crystal
G. K. Perkins, J. Moore, Y. Bugoslavsky +5
Despite the intense activity in the year since the discovery of superconductivity in MgB2, key parameters, in particular the upper and lower critical fields Hc2 and Hc1 and their a…
Disorder-induced Phase Transition of Vortex Matter in MgB2
M. Angst, R. Puzniak, A. Wisniewski +3
Measurements of single crystalline MgB2 with torque magnetometry in fields up to 90 kOe reveal a sharp peak in the irreversible torque at about 0.85 Hc2. In the region between peak…
Mixed state properties of superconducting MgB2 single crystals
M. Zehetmayer, M. Eisterer, H. W. Weber +4
We report on measurements of the magnetic moment in superconducting MgB2 single crystals. We find μ_0H_{c2}^c(0) = 3.2 T, μ_0H_{c2}^{ab}(0) = 14.5 T, γ= 4.6, μ_0H_c(0) = 0.28 T, an…
Electronic Structure and Charge Dynamics of Huesler Alloy Fe2TiSn Probed by Infrared and Optical Spectroscopy
S. V. Dordevic, D. N. Basov, A. Slebarski +2
We report on the electrodynamics of a Heusler alloy Fe2TiSn probed over four decades in energy: from the far infrared to the ultraviolet. Our results do not support the suggestion…
Temperature dependence and anisotropy of the bulk upper critical field H_c2 of MgB_2
A. V. Sologubenko, J. Jun, S. M. Kazakov +2
The bulk upper critical field H_{c2}(T) of superconducting MgB_2 and its anisotropy are established by analyzing experimental data on the temperature and magnetic field dependences…
Thermal conductivity of single crystalline MgB_2
A. V. Sologubenko, J. Jun, S. M. Kazakov +2
The ab-plane thermal conductivity of single-crystalline hexagonal MgB_2 has been measured as a function of magnetic field H with orientations both parallel and perpendicular to…