Khasanov, R., Kondo, Takeshi, Strässle, S., Heron, D. O. G., Kaminski, A., Keller, H., ...
We report on measurements of the in-plane magnetic penetration \lambda_{ab} in the optimally doped cuprate superconductor (BiPb)_2(SrLa)_2CuO_6+\delta (OP Bi2201) by means of muon-spin rotation...
Khasanov, R., Conder, K., Pomjakushina, E., Amato, A., Baines, C., Bukowski, Z., ...
The in-plane magnetic penetration depth \lambda_{ab} of the iron selenide superconductor with the nominal composition FeSe_0.85 was studied by means of muon-spin rotation. The measurements of...
Strong coupling between magnetic and structural order parameters in SrFe2As2 (2008)
Jesche, A., Caroca-Canales, N., Rosner, H., Borrmann, H., Ormeci, A., Kasinathan, D., ...
X-ray and Neutron diffraction as well as muon spin relaxation and M\"ossbauer experiments performed on SrFe$_2$As$_2$ polycrystalls confirm a sharp first order transition at $T_0 = 205$,K...
Origins of large critical temperature variations in single layer cuprates (2008)
Palczewski, A. D., Kondo, T., Khasanov, R., Kolesnikov, N. N., Timonina, A. V., Rotenberg, E., ...
We study the electronic structures of two single layer superconducting cuprates, Tl$_2$Ba$_2$CuO$_{6+\delta}$ (Tl2201) and (Bi$_{1.35}$Pb$_{0.85}$)(Sr$_{1.47}$La$_{0.38}$)CuO$_{6+\delta}$ (Bi2201)...
Electronic phase diagram of the LaO1-xFxFeAs superconductor (2008)
Luetkens, H., Kraken, M., Litterst, F. J., Dellmann, T., Klingeler, R., ...
Recently high-temperature superconductivity has been discovered in ironpnictides providing a new class of unconventional superconductors4,5,6. Similar as in the unconventional superconductors...
Khasanov, R., Kondo, Takeshi, Strässle, S., Heron, D. O. G., Kaminski, A., Keller, H., ...
The in-plane magnetic penetration depth \lambda_{ab} in optimally doped (BiPb)_2(SrLa)_2CuO_{6+\delta} (OP Bi2201) was studied by means of muon-spin rotation. The measurements of \lambda_{ab}^{-2}(T)...
Analysis of $\mu$SR line shapes in the vortex state of type-II superconductors (2008)
Maisuradze, A., Khasanov, R., Shengelaya, A., Keller, H.
A detailed analysis of muon-spin rotation ($\mu$SR) spectra in the vortex state of type-II superconductors using different theoretical models is presented. Analytical approximations of the London and...
Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study (2008)
Luetkens, H., Klingeler, R., Hess, C., Litterst, F. J., Kraken, M., ...
We present a detailed study on the magnetic order in the undoped mother compound LaOFeAs of the recently discovered Fe-based superconductor LaO$_{1-x}$F$_x$FeAs. In particular, we present local probe...
Luetkens, H., Khasanov, R., Amato, A., Klingeler, R., Hellmann, I., ...
We present zero field and transverse field \muSR experiments on the recently discovered electron doped Fe-based superconductor LaO_{1-x}F_xFeAs. The zero field experiments on underdoped (x=0.075) and...
Khasanov, R., Shengelaya, A., Maisuradze, A., Di Castro, D., Savić, I. M., Weyeneth, S., ...
We report on measurements of the in-plane magnetic penetration depth \lambda_{ab} in the infinite-layer electron-doped high-temperature cuprate superconductor Sr_0.9La_0.1CuO_2 by means of muon-spin...
Direct observation of a Fermi surface and superconducting gap in LuNi2B2C (2008)
Starowicz, P., Liu, C., Khasanov, R., Kondo, T., Samolyuk, G., Gardenghi, D., ...
We measured the Fermi surface (FS), band dispersion and superconducting gap in LuNi2B2C using Angle Resolved Photoemission Spectroscopy. Experimental data were compared with the tight-binding version...
Synthesis and Bulk Properties of Oxychloride Superconductor Ca2-xNaxCuO2Cl2 (2007)
Zhigadlo, N. D., Karpinski, J., Weyeneth, S., Khasanov, R., Katrych, S., Wagli, P., ...
Polycrystalline samples and submillimeter size single crystals of Na-doped Ca2CuO2Cl2 have been synthesized under high pressure. A series of experiments showed that the Na content depends not only on...
Khasanov, R., Shengelaya, A., Maisuradze, A., Di Castro, D., Escamilla, R., Keller, H.
The results of the muon-spin rotation experiments on BCS superconductors NbB_2+x (x = 0.2, 0.34) are reported. Both samples, studied in the present work, exhibit rather broad transitions to the...
Oxygen isotope effect on superconductivity and magnetism in Y_1-xPr_xBa_2Cu_3O_7-\delta (2007)
Khasanov, R., Shengelaya, A., Di Castro, D., Morenzoni, E., Maisuradze, A., Savić, I. M., ...
Oxygen isotope (^{16}O/^{18}O) effects (OIE's) on the superconducting transition (T_c), the spin-glass ordering (T_g), and the antiferromagnetic ordering (T_N) temperatures were studied for...
Khasanov, R., Strässle, S., Conder, K., Pomjakushina, E., Bussmann-Holder, A., Keller, H.
The oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the zero-temperature superconducting energy gap \Delta_0 was studied for a series of Y_{1-x}Pr_xBa_2Cu_3O_{7-\delta} samples (0.0\leq x\leq0.45)....
Universal observation of multiple order parameters in cuprate superconductors (2007)
Khasanov, R., Strässle, S., Di Castro, D., Masui, T., Miyasaka, S., Tajima, S., ...
The temperature dependence of the London penetration depth \lambda was measured for an untwined single crystal of YBa_2Cu_3O_{7-\delta} along the three principal crystallographic directions (a, b,...
Morenzoni, E., Luetkens, H., Prokscha, T., Suter, A., Vongtragool, S., Galli, F., ...
We have performed depth dependent muon spin rotation/relaxation studies of the dynamics of single layer films of {\it Au}Fe and {\it Cu}Mn spin glasses as a function of thickness and of its behavior...
Formation of hydrogen impurity states in silicon and insulators at low implantation energies (2007)
Prokscha, T., Morenzoni, E., Eshchenko, D. G., Garifianov, N., Glueckler, H., Khasanov, R., ...
The formation of hydrogen-like muonium (Mu) has been studied as a function of implantation energy in intrinsic Si, thin films of condensed van der Waals gases (N2, Ne, Ar, Xe), fused and crystalline...
s-wave symmetry along the c-axis and s+d in-plane superconductivity in bulk YBa_2Cu_4O_8 (2007)
Khasanov, R., Shengelaya, A., Bussmann-Holder, A., Karpinski, J., Keller, H., Müller, K. A.
To clarify the order parameter symmetry of cuprates, the magnetic penetration depth $\lambda$ was measured along the crystallographic directions $a$, $b$, and $c$ in single crystals of...
Khasanov, R., Zhigadlo, N. D., Karpinski, J., Keller, H.
A study of the in-plane magnetic penetration depth \lambda_ab in a series of the cuprate superconductors Ca_2-xNa_xCuO_2Cl_2 (Na-CCOC) with Na content x=0.11, 0.12, 0.15, 0.18, and 0.19 is reported....
Bishop, A. R., Conradson, S. D., Bussmann-Holder, A., Dolgov, O., Keller, H., Khasanov, R., ...
In a recent letter [1] Pilgram, Rice and Sigrist (PRS) propose to perform oxygen isotope dependent conductivity measurements along the c-axis of the cuprate superconductor BSSCO. In Raman isotope...
Khasanov, R., Shengelaya, A., Di Castro, D, Eshchenko, D. G., Savich, I. M., Conder, K., ...
The magnetic field dependence of the oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic field penetration depth \lambda_{ab} was studied in the hole-doped high-temperature cuprate...
Mixed order parameter symmetries in cuprate superconductors (2006)
Bussmann-Holder, A., Khasanov, R., Shengelaya, A., Maisuradze, A., La Mattina, F., Keller, H., ...
The recent observation of an inflection point in the temperature dependence of the in-plane magnetic field dependence (lambda_ab) is investigated within a two-band model with coupled order parameters...
Real and marginal isotope effects in cuprate superconductors (2006)
Bishop, A. R., Bussmann-Holder, A., Dolgov, O. V., Furrer, A., Kamimura, H., Keller, H., ...
We critically review recent and earlier results on isotope effects in cuprate superconductors and emphasize that the sample preparation and the isotope exchange and back exchange are crucial in...
Coexistence of superconductivity and incoherence in quasi 1D chains (2006)
Khasanov, R., Kondo, T., Schmalian, J., Kazakov, S. M., Zhigadlo, N. D., Karpinski, J., ...
The dimensionality of a correlated many-body system has a large impact on its electronic properties. When electrons are confined to one-dimensional chains of atoms their behavior is very different...
Kondo, T., Khasanov, R., Karpinski, J., Kazakov, S. M., Zhigadlo, N. D., Ohta, T., ...
We use microprobe Angle-Resolved Photoemission Spectroscopy (muARPES) to separately investigate the electronic properties of CuO2 planes and CuO chains in the high temperature superconductor,...
Khasanov, R., Shengelaya, A., Conder, K., Morenzoni, E., Savić, I. M., Karpinski, J., ...
The oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic penetration depth \lambda_{ab}(0) in optimally-doped YBa_2Cu_3O_{7-\delta} and La_{1.85}Sr_{0.15}CuO_4, and in slightly...
Evidence for complex order parameter in La_{1.83}Sr_{0.17}CuO_4 (2006)
Khasanov, R., Shengelaya, A., Maisuradze, A., La Mattina, F., Bussmann-Holder, A., Keller, H., ...
The in-plane magnetic field penetration depth (\lambda_{ab}) in single-crystal La_{1.83}Sr_{0.17}CuO_4 was investigated by means of the muon-spin rotation (\muSR) technique. The temperature...
Khasanov, R., Häfliger, P. S., Shitsevalova, N., Dukhnenko, A., Keller, H.
Measurements of the transition temperature T_c, the second critical filed H_{c2} and the magnetic penetration depth \lambda under hydrostatic pressure (up to 9.2 kbar) in the YB_6 superconductor were...
Landau, I. L., Khasanov, R., Togano, K., Keller, H.
We present temperature dependences of the upper critical magnetic field and the Ginzburg-Landau parameter for a ternary boride superconductor Li_2Pd_3B obtained from magnetization measurements. A...
Muon-spin-rotation measurements of the penetration depth in Li_2Pd_3B (2006)
Khasanov, R., Landau, I. L., Baines, C., La Mattina, F., Maisuradze, A., Togano, K., ...
Measurements of the magnetic field penetration depth $\lambda$ in the ternary boride superconductor Li$_2$Pd$_3$B ($T_c\simeq7.3$ K) have been carried out by means of muon-spin rotation ($\mu$SR)....
Anomalous electron-phonon coupling probed on the surface of ZrB$_{12}$ superconductor (2005)
Khasanov, R., Di Castro, D., Belogolovskii, M., Paderno, Yu., Filippov, V., Brütsch, R., ...
Magnetization measurements under hydrostatic pressure up to 10.5 kbar in zirconium dodecaboride ZrB$_{12}$ superconductor ($T_c\simeq6.0$ K at $p=0$) were carried out. A negative pressure effect on...
Suter, A., Morenzoni, E., Garifianov, N., Khasanov, R., Kirk, E., Luetkens, H., ...
Implanting fully polarized low energy muons on the nanometer scale beneath the surface of a superconductor in the Meissner state enabled us to probe the evanescent magnetic field profile B(z)(0
Schneider, T., Khasanov, R., Di Castro, D., Keller, H., Kim, Mun-Seog, Jung, C. U., ...
We present and analyze field cooled magnetization data, revealing for 0
Shengelaya, A., Khasanov, R., Eshchenko, D. G., Di Castro, D., Savic, I. M., Park, M. S., ...
Muon spin rotation (mSR) measurements of the in-plane penetration depth lambda_ab have been performed in the electron-doped infinite layer high-Tc superconductor (HTS) Sr0.9La0.1CuO2. Absence of the...
Pressure effects on the superconducting properties of YBa_2Cu_4O_8 (2005)
Khasanov, R., Schneider, T., Keller, H.
Measurements of the magnetization under high hydrostatic pressure (up to 10.2 kbar) in YBa_2Cu_4O_8 were carried out. From the scaling analysis of the magnetization data the pressure induced shifts...
Schneider, T., Khasanov, R., Karpinski, J., Kazakov, S. M., Keller, H.
The effect of the magnetic field on the critical behavior of RbOs2O6 is investigated. We present and analyze magnetization data, revealing remarkable consistency with a magnetic field induced finye...
Coexistence and coupling of superconductivity and magnetism in thin film structures (2005)
Drew, A J, Lee, S L, Charalambous, D, Potenza, A, Marrows, C, Luetkens, H, ...
Superconducting and magnetic order are usually mutually exclusive, and are found to coexist in relatively few materials. We have obtained direct evidence for a spin-density wave (SDW) coexisting with...
Surface dynamics of a thin polystyrene film probed by low-energy muons (2005)
Pratt, FL, Lancaster, T, Brooks, ML, Blundell, SJ, Prokscha, T, Morenzoni, E, ...
Study of pressure effect on the magnetic penetration depth in MgB$_2$ (2004)
Di Castro, D., Khasanov, R., Grimaldi, C., Karpinski, J., Kazakov, S. M., Keller, H.
A study of the pressure effect on the magnetic penetration depth $\lambda$ in polycrystalline MgB$_{2}$ was performed by measuring the temperature dependence of the magnetization under an applied...
Study of the magnetic penetration depth in RbOs_2O_6 (2004)
Khasanov, R., Eshchenko, D. G., Di Castro, D., Shengelaya, A., La Mattina, F., Maisuradze, A., ...
Measurements of the magnetic field penetration depth \lambda in the pyrochlore superconductor RbOs_2O_6 (T_c\simeq6.3 K) were carried out by means of the muon-spin-rotation (\muSR) technique. At low...
Evidence for charged critical behavior in the pyrochlore superconductor RbOs2O6 (2004)
Schneider, T., Khasanov, R., Keller, H.
We analyze magnetic penetration depth data of the recently discovered superconducting pyrochlore oxide RbOs2O6. Our results strongly suggest that in RbOs2O6 charged critical fuctuations dominate the...
Evidence for charged critical fluctuations in underdoped Y-123 (2004)
Schneider, T., Khasanov, R., Conder, K., Pomjakushina, E., Bruetsch, R., Keller, H.
We report and analyze in-plane penetration depth measurements in YBa2Cu3O7-x taken close to the critical temperature Tc. In underdoped YBa2Cu3O6:59 we find consistent evidence for charged critical...
Pressure effect on the in-plane magnetic penetration depth in YBa_2Cu_4O_8 (2004)
Khasanov, R., Karpinski, J., Keller, H.
We report a study of the pressure effect (PE) on the in-plane magnetic field penetration depth lambda_{ab} in YBa_2Cu_4O_8 by means of Meissner fraction measurements. A pronounced PE on...
Anisotropy and internal field distribution of MgB2 in the mixed state at low temperatures (2004)
Angst, M., Di Castro, D., Eshchenko, D. G., Khasanov, R., Kohout, S., Savic, I. M., ...
Magnetization and muon spin relaxation on MgB2 were measured as a function of field at 2 K. Both indicate an inverse-squared penetration depth strongly decreasing with increasing field H below about...
Khasanov, R., Eshchenko, D. G., Karpinski, J., Kazakov, S. M., Zhigadlo, N. D., Brütsch, R., ...
We report magnetization measurements under high hydrostatic pressure in the newly discovered pyrochlore superconductor RbOs_2O_6 (T_c\simeq6.3K at p=0). A pronounced and {\it positive} pressure...
Oxygen-isotope effect on the in-plane penetration depth in cuprate superconductors (2004)
Khasanov, R., Shengelaya, A., Morenzoni, E., Conder, K., Savić, I. M., Keller, H.
Muon-spin rotation (muSR) studies of the oxygen isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic field penetration depth lambda_{ab} in cuprate high-temperature superconductors (HTS) are...
Khasanov, R., Schneider, T., Karpinski, J., Keller, H.
We explore the combined pressure and finite-size effects on the in-plane penetration depth \lambda_{ab} in YBa_2Cu_4O_8. Even though this cuprate is stoichiometric the finite-size scaling analysis of...
Direct observation of non-local effects in a superconductor (2003)
Suter, A., Morenzoni, E., Khasanov, R., Luetkens, H., Prokscha, T., Garifianov, N.
We have used the technique of low energy muon spin rotation to measure the local magnetic field profile B(z) beneath the surface of a lead film maintained in the Meissner state (z depth from the...
Khasanov, R., Shengelaya, A., Morenzoni, E., Angst, M., Conder, K., Savić, I. M., ...
We report site-selective oxygen isotope ($^{16}$O/$^{18}$O) effect (OIE) measurements on the in-plane penetration depth $\lambda_{ab} $ in underdoped Y$_{0.6}$Pr$_{0.4}$Ba$_2$Cu$_3$O$_{7-\delta}$,...
Absence of a boron isotope effect in the magnetic penetration depth of MgB$_{2}$ (2003)
Di Castro, D., Angst, M., Eshchenko, D. G., Khasanov, R., Roos, J., Savić, I. M., ...
The magnetic penetration depth $\lambda(0)$ in polycrystalline MgB$_{2}$ for different boron isotopes ($^{10}$B/$^{11}$B) was investigated by transverse field muon spin rotation. No boron isotope...
Khasanov, R., Eshchenko, D. G., Luetkens, H., Morenzoni, E., Prokscha, T., Suter, A., ...
We report the first direct observation of the oxygen-isotope ($^{16}$O/$^{18}$O) effect on the in-plane penetration depth $\lambda_{ab}$ in a nearly optimally doped YBa$_2$Cu$_3$O$_{7-\delta}$ film...
Relevance of electron-lattice coupling in cuprates superconductors (2003)
Schneider, T., Khasanov, R., Conder, K., Keller, H.
We study the oxygen isotope (^{16}O,^{18}O) and finite size effects in Y_{1-x}Pr_{x}Ba_{2}Cu_{3}O_{7-\delta} by in-plane penetration depth (\lambda _{ab}) measurements. A significant change of the...
Vortex motion in type II superconductors probed by muon spin rotation and SANS (2003)
Forgan, E M, Charalambous, D, Kealey, P G, King, P J C, Khasanov, R, Amato, A
Drew, A J, Lee, S L, Divakar, U K, Charalambous, D, Potenza, A, Marrows, C, ...
We have obtained direct evidence for the coexistence of a spin density wave (SDW) with bulk superconductivity in the SC layer in a FM/SC/FM bilayer. The enhancement of the SDW amplitude in the...
On the effect of heterovalent substitutions in ruthenocuprates (2002)
Klamut, P. W., Dabrowski, B., Mini, S. M., Maxwell, M., Mais, J., Felner, I., ...
We discuss the properties of superconducting derivatives of the RuSr2GdCu2O8 (1212-type) ruthenocuprate, for which heterovalent doping has been achieved through partial substitution of Cu ions into...
Khasanov, R., Shengelaya, A., Conder, K., Morenzoni, E., Savić, I. M., Keller, H.
The oxygen-isotope (^16O/^18O) effect (OIE) on the in-plane penetration depth $\lambda_{ab} (0)$ in underdoped Y_{1-x}Pr_xBa_2Cu_3O_{7-delta} was studied by muon-spin rotation. A pronounced OIE on...
Magnetic Properties of RuSr2RECu2O8 (RE=Gd, Eu) and Ru1-xSr2GdCu2+xO8-y Superconductors (2001)
Klamut, P. W., Dabrowski, B., Mini, S. M., Maxwell, M., Kolesnik, S., Mais, M., ...
Synthesis in 1% oxygen at 930C leads to non-superconducting RuSr2GdCu2O8 in which superconductivity subsequently can be induced with oxygen annealings without observable stoichiometric changes....