Scientific Commons: Ch Niedermayer

We present a muon spin rotation (μSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2−xCoxAs₂ with x = 0.08, 0.20 and 0.25 (Tc = 9, 25 and 20 K)...

Muon spin rotation study of magnetism and superconductivity in BaFe2−xCoxAs₂ and Pr1−xSrxFeAsO (2009)

Bernhard, Christian, Drew, Alan J., Schulz, Leander, Malik, Vivek Kumar, Rössle, Matthias, Niedermayer, Ch., ...

We present a muon spin rotation (μSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2−xCoxAs₂ with x = 0.08, 0.20 and 0.25 (Tc = 9, 25 and 20 K)...

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba1-xKxFe₂As₂ (2009)

Park, J. T., Inosov, D. S., Niedermayer, Ch., Sun, G. L., Haug, D., Christensen, N. B., ...

Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba1-xKxFe₂As₂ by means of x-ray powder diffraction, neutron scattering, muon-spin rotation (µSR), and...

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba1-xKxFe₂As₂ (2009)

Park, J. T., Inosov, D. S., Niedermayer, Ch., Sun, G. L., Haug, D., Christensen, N. B., ...

Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba1-xKxFe₂As₂ by means of x-ray powder diffraction, neutron scattering, muon-spin rotation (µSR), and...

Magnetic ordering in electronically phase separated Sr/O co-doped La(2-x)Sr(x)CuO(4+y) (2009)

Udby, L., Andersen, N. H., Chou, F. C., Christensen, N. B., Emery, S. B., Lefmann, K., ...

We present results of magnetic neutron diffraction experiments on the co-doped super-oxygenated La(2-x)Sr(x)CuO(4+y) (LSCO+O) system with x=0.09. The spin-density wave has been studied and we find...

Suppression of the structural phase transition and lattice softening in slightly underdoped Ba(1-x)K(x)Fe2As2 with electronic phase separation (2009)

Inosov, D. S., Leineweber, A., Yang, Xiaoping, Park, J. T., Christensen, N. B., Dinnebier, R., ...

We present x-ray powder diffraction (XRPD) and neutron diffraction measurements on the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe2As2, Tc = 32K. Below the magnetic transition...

Momentum-resolved superconducting gap in the bulk of Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ from combined ARPES and $\mu$SR measurements (2009)

Evtushinsky, D. V., Inosov, D. S., Zabolotnyy, V. B., Viazovska, M. S., Khasanov, R., Amato, A., ...

Here we present a calculation of the temperature-dependent London penetration depth, $\lambda(T)$, in Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ (BKFA) on the basis of the electronic band structure [1,2] and...

Magnetic-field-enhanced incommensurate magnetism in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45) (2009)

Haug, D., Hinkov, V., Suchaneck, A., Inosov, D. S., Christensen, N. B., Niedermayer, Ch., ...

We present a neutron-scattering study of the static and dynamic spin correlations in the underdoped high-temperature superconductor YBa(2)Cu(3)O(6.45) in magnetic fields up to 15 T. The field...

Field-induced soft-mode quantum phase transition in La$_{1.855}$Sr$_{0.145}$CuO$_{4}$ (2009)

Chang, J., Christensen, N. B., Niedermayer, Ch., Lefmann, K., Roennow, H. M., McMorrow, D. F., ...

Inelastic neutron-scattering experiments on the high-temperature superconductor La$_{1.855}$Sr$_{0.145}$CuO$_{4}$ reveal a magnetic excitation gap $\Delta$ that decreases continuously upon...

Muon spin rotation study of magnetism and superconductivity in BaFe2-xCoxAs2 and Pr1-xSrxFeAsO (2009)

Bernhard, C., Drew, A. J., Schulz, L., Malik, V. K., Roessle, M., Niedermayer, Ch., ...

We present a muon spin rotation (\muSR) study of the magnetic and superconducting properties of single crystals of electron-doped BaFe2-xCoxAs2 with x=0.08, 0.20, and 0.25 (Tc=9, 25 and 20K) and of...

Two-gap superconductivity in Ba_{1-x}K_xFe_2As_2 inferred from investigations of the magnetic penetration depth (2009)

Khasanov, R., Amato, A., Luetkens, H., Niedermayer, Ch., Sun, G. L., ...

Using muon-spin rotation, we studied the anisotropy of the magnetic-field penetration depth \gamma_\lambda=\lambda_c/\lambda_ab in an extensively characterized sample of superconducting...

Electronic phase separation in the slightly underdoped iron pnictide superconductor Ba(1-x)K(x)Fe(2)As(2) (2008)

Park, J. T., Inosov, D. S., Niedermayer, Ch., Sun, G. L., Haug, D., Christensen, N. B., ...

Here we present a combined study of the slightly underdoped novel pnictide superconductor Ba(1-x)K(x)Fe(2)As(2) by means of X-ray powder diffraction, neutron scattering, muon spin rotation (muSR),...

Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2 (2008)

Schulze, T. F., Bruehwiler, M., Haefliger, P. S., Kazakov, S. M., Niedermayer, Ch., Mattenberger, K., ...

In this study an extended low energy phase diagram for NaxCoO2 is experimentally established with emphasis on the high x range. It is based on systematic heat capacity studies on both polycrystalline...

Coexistence of static magnetism and superconductivity in SmFeAsO1-xFx as revealed by muon spin rotation (2008)

Drew, A. J., Niedermayer, Ch., Baker, P. J., Pratt, F. L., Blundell, S. J., Lancaster, T., ...

The recent observation of superconductivity with critical temperatures up to 55 K in the FeAs based pnictide compounds marks the first discovery of a non copper-oxide based layered high-Tc...

Flux pinning and phase separation in oxygen rich La2-xSrxCuO4+y system (2008)

Mohottala, Hashini E., Wells, B. O., Budnick, J. I., Hines, W. A., Niedermayer, Ch., Chou, F. C.

We have studied the magnetic characteristics of a series of super-oxygenated La2-xSrxCuO4+y samples. As shown in previous work, these samples spontaneously phase separate into an oxygen rich...

Tuning competing orders in La2-xSrxCuO4 cuprate superconductors by the application of an external magnetic field (2008)

Chang, J., Niedermayer, Ch., Gilardi, R., Christensen, N. B., Ronnow, H. M., McMorrow, D. F., ...

We report the results of a combined muon-spin rotation and neutron-scattering study on La2-xSrxCuO4 in the vicinity of the so-called 1/8 anomaly. Application of a magnetic field drives the system...

Muon-spin rotation study of magnetism in NaxCoO₂ single crystals with 0.78 ≼ x ≼ 0.97 (2007)

Bernhard, Christian, Niedermayer, Ch., Drew, Alan, Khaliullin, G., Bayrakci, S., Strempfer, J., ...

By muon spin rotation we investigated the magnetic properties of a series of highly Na-doped NaxCoO₂ single crystals with 0.78(1) ≼ x ≼ 0.97(1). Our data provide evidence for an intrinsically...

Muon-spin rotation study of magnetism in NaxCoO₂ single crystals with 0.78 ≼ x ≼ 0.97 (2007)

Bernhard, Christian, Niedermayer, Ch., Drew, Alan, Khaliullin, G., Bayrakci, S., Strempfer, J., ...

By muon spin rotation we investigated the magnetic properties of a series of highly Na-doped NaxCoO₂ single crystals with 0.78(1) ≼ x ≼ 0.97(1). Our data provide evidence for an intrinsically...

Tuning competing orders in La2-xSrxCuO4 cuprate superconductors by the application of an external magnetic field (2007)

Chang, J., Niedermayer, Ch., Gilardi, R., Christensen, N. B., Ronnow, H. M., McMorrow, D. F., ...

We report the results of a combined muon spin rotation and neutron scattering study on La2-xSrxCuO4 in the vicinity of the so-called 1/8-anomaly. Application of a magnetic field drives the system...

Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped superconductor La$_{1.895}$Sr$_{0.105}$CuO$_{4}$ (2007)

Chang, J., Schnyder, A. P., Gilardi, R., Ronnow, H. M., Pailhes, S., Christensen, N. B., ...

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La$_{1.895}$Sr$_{0.105}$CuO$_{4}$ (LSCO). In zero field, the temperature dependence of the...

Doping induced magnetic clusters and Co spin state transition in Na_xCoO_2 with 0.78 (2007)

Bernhard, C., Niedermayer, Ch., Drew, A., Khaliullin, G., Bayrakci, S., Strempfer, J., ...

By muon spin rotation we investigated the magnetic properties of a series of highly Na doped NaxCoO2 single crystals with 0.78(1)

Magnetic-field-induced spin excitations and renormalized spin gap of the underdoped La1.895Sr0.105CuO4 superconductor (2007)

Chang, J., Schnyder, A. P., Gilardi, R., Ronnow, H. M., Pailhes, S., Christensen, N. B., ...

High-resolution neutron inelastic scattering experiments in applied magnetic fields have been performed on La1.895Sr0.105CuO4 (LSCO). In zero field, the temperature dependence of the low-energy peak...

Multiple magnon modes and consequences for the Bose-Einstein condensed phase in BaCuSi2O6 (2007)

Ruegg, Ch., McMorrow, D. F., Normand, B., Ronnow, H. M., Sebastian, S. E., Fisher, I. R., ...

The compound BaCuSi2O6 is a quantum magnet with antiferromagnetic dimers of S=1/2 moments on a quasi-2D square lattice. We have investigated its spin dynamics by inelastic neutron scattering...

Quantum statistics of interacting dimer spin systems (2006)

Rüegg, Ch., Normand, Bruce, Matsumoto, M., Niedermayer, Ch., Furrer, A., Krämer, K. W., ...

The compound TlCuCl₃ represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic...

Quantum statistics of interacting dimer spin systems (2006)

Rüegg, Ch., Normand, Bruce, Matsumoto, M., Niedermayer, Ch., Furrer, A., Krämer, K. W., ...

The compound TlCuCl₃ represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic...

Multiple Magnon Modes and Consequences for the Bose-Einstein Condensed Phase in BaCuSi2O6 (2006)

Rüegg, Ch., McMorrow, D. F., Normand, B., Ronnow, H. M., Sebastian, S. E., Fisher, I. R., ...

The compound BaCuSi2O6 is a quantum magnet with antiferromagnetic dimers of S = 1/2 moments on a quasi-2D square lattice. We have investigated its spin dynamics by inelastic neutron scattering...

NaxCoO2: Enhanced low-energy excitations of electrons on a 2D triangular lattice (2006)

Brühwiler, M., Batlogg, B., Kazakov, S. M., Niedermayer, Ch., Karpinski, J.

To elucidate the low-energy excitation spectrum of correlated electrons on a 2D triangular lattice, we have studied the electrical resistance and specific heat down to 0.5 K and in magnetic fields up...

Quantum Statistics of Interacting Dimer Spin Systems (2005)

Rüegg, Ch., Normand, B., Matsumoto, M., Niedermayer, Ch., Furrer, A., Krämer, K. W., ...

The compound TlCuCl3 represents a model system of dimerized quantum spins with strong interdimer interactions. We investigate the triplet dispersion as a function of temperature by inelastic neutron...

Effect of two gaps on the flux lattice internal field distribution: evidence of two length scales from muSR in Mg1-xAlxB2 (2004)

Serventi, S., Allodi, G., De Renzi, R., Guidi, G., Romanò, L., Manfrinetti, P., ...

We have measured the transverse field muon spin precession in the flux lattice (FL) state of the two gap superconductor MgB2 and of the electron doped compounds Mg1-xAlxB2 in magnetic fields up to...

Muon-spin-relaxation study of the magnetic penetration depth in MgB2 (2001)

Niedermayer, Ch., Bernhard, C., Holden, T., Kremer, R. K., Ahn, K.

The magnetic vortex lattice (VL) of polycrystalline MgB2 has been investigated by transverse-field muon-spin-relaxation (TF-MuSR). The evolution of TF-MuSR depolarization rate, sigma, that is...

Anomalous peak in the superconducting condensate density of cuprate high T_{c} superconductors at a unique critical doping state (2000)

Bernhard, C., Tallon, J. L., Blasius, Th., Golnik, A., Niedermayer, Ch.

The doping dependence of the superconducting condensate density, n_{s}^{o}, has been studied by muon-spin-rotation for Y_{0.8}Ca_{0.2}Ba_{2}(Cu_{1-z}Zn_{z})_{3}O_{7-\delta} and...

Shallow level muonium centre in CdS (2000)

Gil, J M, Alberto, H V, Vilao, R C, Piroto Duarte, J, Mendes, P J, ...

High temperature trapping of muons in CuInSe2 and CuInS2 (2000)

Gil, J M, Alberto, H V, Vilao, R C, Piroto Duarte, J, Mendes, P J, ...

Evidence for a Two-stage Melting Transition of the Vortex Matter in Bi2Sr2Ca1Cu2O8+d Single Crystals obtained by Muon Spin Rotation (1999)

Blasius, T., Niedermayer, Ch., Tallon, J. L., Pooke, D. M., Golnik, A., Bernhard, C.

From muon spin rotation measurements on under- to overdoped Bi-2212 crystals we obtain evidence for a two-stage transition of the vortex matter as a function of temperature. The first transition is...

Coexistence of ferromagnetism and superconductivity in the hybrid ruthenate-cuprate compound RuSr_2GdCu_2O_8 studied by muon spin rotation (\mu SR) and DC-magnetization (1999)

Bernhard, C., Tallon, J. L., Niedermayer, Ch., Blasius, Th., Golnik, A., Brücher, E., ...

We have investigated the magnetic and the superconducting properties of the hybrid ruthenate-cuprate compound RuSr_{2}GdCu_{2}O_{8} by means of zero-field muon spin rotation- (ZF-$\mu $SR) and DC...

Comment on Muon Spin Rotation studied of Zn-substitution effects in high Tc cuprate superconductors (1998)

Bernhard, C, Tallon, J L, Bucci, C, De Renzi, R, Guidi, G, Williams, G V M, ...

A Muon Spin Rotation study of Zn- and Ni-impurity related magnetic moments in cuprate high-Tc superconductors (1998)

Bernhard, C, Niedermayer, Ch, Blasius, Th, Williams, G V M, De Renzi, R, Bucci, C, ...

muSR measurement of the superconducting condensate reduction induced by Zn in underdoped, optimally doped and overdoped YBCO (1997)

Bucci, C, De Renzi, R, Guidi, G, Bernhard, C, Niedermayer, Ch, Licci, F, ...

Suppression of the superconducting condensate in the high-Tc cuprates by Zn substitution and overdoping evidence for an unconventional pairing state (1996)

Bernhard, C, Tallon, J L, Bucci, C, De Renzi, R, Guidi, G, Williams, G V M, ...

Ch Niedermayer

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