Publications (57)
Observation of two independent skyrmion phases in a chiral magnetic material
A. Chacon, L. Heinen, M. Halder +7
Magnetic materials can host skyrmions, which are topologically non-trivial spin textures. In chiral magnets with cubic lattice symmetry, all previously-observed skyrmion phases req…
Weak crystallization of fluctuating skyrmion textures in MnSi
J. Kindervater, I. Stasinopoulos, A. Bauer +8
We report an experimental study of the emergence of non-trivial topological winding and long-range order across the paramagnetic to skyrmion lattice transition in the transition me…
Ultra-high vacuum compatible preparation chain for intermetallic compounds
A. Bauer, G. Benka, A. Regnat +2
We report the development of a versatile material preparation chain for intermetallic compounds that focuses on the realization of a high-purity growth environment. The preparation…
Exploring the Time Domain with the Palomar-QUEST Sky Survey
A. Mahabal, S. G. Djorgovski, M. J. Graham +16
Exploration of the time variability on the sky over a broad range of flux levels and wavelengths is rapidly becoming a new frontier of astronomical research. We describe here brief…
Emergent electrodynamics of skyrmions in a chiral magnet
T. Schulz, R. Ritz, A. Bauer +7
When an electron moves in a smoothly varying non-collinear magnetic structure, its spin-orientation adapts constantly, thereby inducing forces that act on both the magnetic structu…
A unified diagrammatic approach to topological fixed point models
A. Bauer, J. Eisert, C. Wille
We introduce a systematic mathematical language for describing fixed point models and apply it to the study to topological phases of matter. The framework is reminiscent of state-s…
Magnetic properties of the noncentrosymmetric tetragonal antiferromagnet EuPtSi
A. Bauer, A. Senyshyn, R. Bozhanova +6
We report a comprehensive study of single crystals of the noncentrosymmetric rare-earth compound EuPtSi grown by the optical floating-zone technique. Measurements of the magn…
Present criteria for prophylactic ICD implantation: Insights from the EU-CERT-ICD (Comparative Effectiveness Research to Assess the Use of Primary ProphylacTic Implantable Cardioverter Defibrillators in EUrope) project
M. Zabel, S. Schlögl, A. Lubinski +45
BACKGROUND. The clinical effectiveness of primary prevention implantable cardioverter defibrillator (ICD) therapy is under debate. It is urgently needed to better identify patients…
Formation of a topological non-Fermi liquid in MnSi
R. Ritz, M. Halder, M. Wagner +3
Fermi liquid theory provides a remarkably powerful framework for the description of the conduction electrons in metals and their ordering phenomena, such as superconductivity, ferr…
Multidomain Skyrmion Lattice State in CuOSeO
S. L. Zhang, A. Bauer, D. M. Burn +7
Magnetic skyrmions in chiral magnets are nanoscale, topologically-protected magnetization swirls that are promising candidates for spintronics memory carriers. Therefore, observing…
Golden gravitational lensing systems from the Sloan Lens ACS Survey. I. SDSS J1538+5817: one lens for two sources
C. Grillo, T. Eichner, S. Seitz +4
We present a lensing and photometric study of the exceptional system SDSS J1538+5817, identified by the SLACS survey. The lens is a luminous elliptical at redshift z=0.143. Using H…
De Haas-van Alphen effect and Fermi surface properties of single crystal CrB2
M. Brasse, L. Chioncel, J. Kunes +7
We report the angular dependence of three distinct de Haas-van Alphen (dHvA) frequencies of the torque magnetization in the itinerant antiferromagnet CrB2 at temperatures down to 0…
Lifetime Widths of Surface States on Magnetic Lanthanide Metals
A. Bauer, D. Wegner, G. Kaindl
Low-temperature scanning tunneling spectroscopy is used to study electronic structure and dynamics of d-like surface states of trivalent lanthanide metals from La to Lu. The magnet…
Influence of the magneto-volume effect on the transient reflectivity of MnSi
J. Kalin, S. Sievers, H. Füser +4
The magneto-volume effect is a well-established yet frequently overlooked phenomenon in magnetic materials that may affect a wide range of physical properties. Our study explores t…
Response of the skyrmion lattice in MnSi to cubic magnetocrystalline anisotropies
T. Adams, M. Garst, A. Bauer +2
We report high-precision small angle neutron scattering of the orientation of the skyrmion lattice in a spherical sample of MnSi under systematic changes of the magnetic field dire…
Kinetic small angle neutron scattering of the Skyrmion lattice in MnSi
S. Mühlbauer, J. Kindervater, T. Adams +3
We report a kinetic small angle neutron scattering study of the skyrmion lattice (SL) in MnSi. Induced by an oscillatory tilting of the magnetic field direction, the elasticity and…
Evolution of magneto-crystalline anisotropies in MnFeSi and MnCoSi as inferred from small-angle neutron scattering and bulk properties
J. Kindervater, T. Adams, A. Bauer +12
We report a comprehensive small-angle neutron scattering~(SANS) study of MnFeSi at zero magnetic field. To delineate changes of magneto-crystalline anisotropies (MCAs…
Matching coefficients for alpha_s and m_b to O(alpha_s^2) in the MSSM
A. Bauer, L. Mihaila, J. Salomon
We compute the exact two-loop matching coefficients for the strong coupling constant alpha_s and the bottom-quark mass m_b within the Minimal Supersymmetric Standard Model (MSSM),…
The Palomar-Quest Digital Synoptic Sky Survey
S. G. Djorgovski, C. Baltay, A. A. Mahabal +10
We describe briefly the Palomar-Quest (PQ) digital synoptic sky survey, including its parameters, data processing, status, and plans. Exploration of the time domain is now the cent…
Long-range crystalline nature of the skyrmion lattice in MnSi
T. Adams, S. Mühlbauer, C. Pfleiderer +9
We report small angle neutron scattering of the skyrmion lattice in MnSi using an experimental set-up that minimizes the effects of demagnetizing fields and double scattering. Unde…
Giant generic topological Hall resistivity of MnSi under pressure
R. Ritz, M. Halder, C. Franz +5
We report detailed low temperature magnetotransport and magnetization measurements in MnSi under pressures up to . Tracking the role of sample quality, pressure…
Dynamical defects in rotating magnetic skyrmion lattices
S. Pöllath, J. Wild, L. Heinen +9
The chiral magnet CuOSeO hosts a skyrmion lattice, that may be equivalently described as a superposition of plane waves or lattice of particle-like topological objects.…
Band structure of helimagnons in MnSi resolved by inelastic neutron scattering
M. Kugler, G. Brandl, J. Waizner +8
A magnetic helix realizes a one-dimensional magnetic crystal with a period given by the pitch length . Its spin-wave excitations -- the helimagnons -- experience Bragg scatte…
Nearby Supernova Factory Observations of SN 2006D: On Sporadic Carbon Signatures in Early Type Ia Supernova Spectra
The Nearby Supernova Factory, :, R. C. Thomas +27
We present four spectra of the Type Ia supernova (SN Ia) 2006D extending from -7 to +13 days with respect to B-band maximum. The spectra include the strongest signature of unburned…
Galaxy And Mass Assembly (GAMA): Galaxy environments and star formation rate variations
D. B. Wijesinghe, A. M. Hopkins, S. Brough +23
We present a detailed investigation into the effects of galaxy environment on their star formation rates (SFR) using galaxies observed in the Galaxy and Mass Assembly Survey (GAMA)…
Canted antiferromagnetism in phase-pure CuMnSb
A. Regnat, A. Bauer, A. Senyshyn +8
We report the low-temperature properties of phase-pure single crystals of the half-Heusler compound CuMnSb grown by means of optical float-zoning. The magnetization, specific heat,…
Uniaxial pressure dependence of magnetic order in MnSi
A. Chacon, A. Bauer, T. Adams +5
We report comprehensive small angle neutron scattering (SANS) measurements complemented by ac susceptibility data of the helical order, conical phase and skyrmion lattice phase (SL…
Galaxy And Mass Assembly (GAMA) Blended Spectra Catalog: Strong Galaxy-Galaxy Lens and Occulting Galaxy Pair Candidates
B. W. Holwerda, I. K. Baldry, M. Alpaslan +13
We present the catalogue of blended galaxy spectra from the Galaxy And Mass Assembly (GAMA) survey. These are cases where light from two galaxies are significantly detected in a si…
Time Domain Explorations With Digital Sky Surveys
A. A. Mahabal, S. G. Djorgovski, M. J. Graham +17
One of the new frontiers of astronomical research is the exploration of time variability on the sky at different wavelengths and flux levels. We have carried out a pilot project us…
Nearby Supernova Factory Observations of SN 2005gj: Another Type Ia Supernova in a Massive Circumstellar Envelope
The Nearby Supernova Factory Collaboration, G. Aldering, P. Antilogus +24
We report Nearby Supernova Factory observations of SN 2005gj, the second confirmed case of a "hybrid" Type Ia/IIn supernova. Our early-phase photometry of SN 2005gj shows that the…
Imaging and manipulation of skyrmion lattice domains in Cu2OSeO3
S. L. Zhang, A. Bauer, H. Berger +3
Nanoscale chiral skyrmions in noncentrosymmetric helimagnets are promising binary state variables in high-density, low-energy nonvolatile memory. Skyrmions are ubiquitous as an ord…
Long-range magnetic order in CePdAl enabled by orthorhombic deformation
M. Stekiel, P. Äermák, C. Franz +13
We investigate the effect of structural deformation on the magnetic properties of orthorhombic CePdAl in relation to its tetragonal polymorph. Utilizing x-ray and neutron diffr…
Entropy-limited topological protection of skyrmions
J. Wild, T. N. G. Meier, S. Pöllath +11
Magnetic skyrmions are topologically protected whirls that decay through singular magnetic configurations known as Bloch points. We have used Lorentz transmission electron microsco…
Spin Transfer Torques in MnSi at Ultra-low Current Densities
F. Jonietz, S. Mühlbauer, C. Pfleiderer +10
Spin manipulation using electric currents is one of the most promising directions in the field of spintronics. We used neutron scattering to observe the influence of an electric cu…
Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
T. Adams, A. Chacon, M. Wagner +6
We report a long-wavelength helimagnetic superstructure in bulk samples of the ferrimagnetic insulator Cu2OSeO3. The magnetic phase diagram associated with the helimagnetic modulat…
Linearly polarized GHz magnetization dynamics of spin helix modes in the ferrimagnetic insulator CuOSeO
I. Stasinopoulos, S. Weichselbaumer, A. Bauer +5
Linear dichroism -- the polarization dependent absorption of electromagnetic waves -- is routinely exploited in applications as diverse as structure determination of DNA or polariz…
Electronic Structure and Dynamics of Quantum-Well States in thin Yb-Metal Films
D. Wegner, A. Bauer, G. Kaindl
Quantum-well states above the Fermi energy in thin Yb(111)-metal films deposited on a W(110) single crystal were studied by low-temperature scanning tunneling spectroscopy. These s…
Low spin wave damping in the insulating chiral magnet CuOSeO
I. Stasinopoulos, S. Weichselbaumer, A. Bauer +6
Chiral magnets with topologically nontrivial spin order such as Skyrmions have generated enormous interest in both fundamental and applied sciences. We report broadband microwave s…
Real-Space and Reciprocal-Space Berry Phases in the Hall Effect of MnFeSi
C. Franz, F. Freimuth, A. Bauer +8
We report an experimental and computational study of the Hall effect in MnFeSi, as complemented by measurements in MnCoSi, when helimagn…
SPOKES: an End-to-End Simulation Facility for Spectroscopic Cosmological Surveys
B. Nord, A. Amara, A. Refregier +15
The nature of dark matter, dark energy and large-scale gravity pose some of the most pressing questions in cosmology today. These fundamental questions require highly precise measu…
Magnetic phase diagram of MnSi inferred from magnetization and ac susceptibility
A. Bauer, C. Pfleiderer
We report simultaneous measurements of the magnetization and the ac susceptibility across the magnetic phase diagram of single-crystal MnSi. In our study we explore the importance…
Bistability in superconducting rings containing an inhomogeneous Josephson junction
M. Gaass, S. Nadj-Perge, Z. RadoviÄ +4
We investigate the magnetic response of a superconducting Nb ring containing a ferromagnetic PdNi Josephson junction and a tunnel junction in parallel. A doubling of the switching…
Topological magnon band structure of emergent Landau levels in a skyrmion lattice
T. Weber, D. M. Fobes, J. Waizner +16
The motion of a spin excitation across topologically non-trivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charge…
Thermodynamic evidence of a second skyrmion lattice phase and tilted conical phase in Cu0SeO
M. Halder, A. Chacon, A. Bauer +7
Precision measurements of the magnetization and ac susceptibility of Cu0SeO are reported for magnetic fields along different crystallographic directions, focussing on the b…
Effects of impurities on Tamm-like lanthanide-metal surface states
D. Wegner, A. Bauer, G. Kaindl
The effects of isolated residual-gas adsorbates on the local electronic structure of the Dy(0001) surface were spatially mapped by scanning tunneling microscopy and spectroscopy at…
Resonant Elastic X-ray Scattering from the Skyrmion Lattice in CuOSeO
S. L. Zhang, A. Bauer, H. Berger +3
We report the study of the skyrmion state near the surface of CuOSeO using soft resonant elastic x-ray scattering (REXS) at the Cu edge. Within the lateral sampling a…
Observation of Coherent Helimagnons and Gilbert damping in an Itinerant Magnet
J. D. Koralek, D. Meier, J. P. Hinton +7
We study the magnetic excitations of itinerant helimagnets by applying time-resolved optical spectroscopy to Fe0.8Co0.2Si. Optically excited oscillations of the magnetization in th…
Incommensurate antiferromagnetic order in CePtAl
M. Stekiel, P. Cermak, C. Franz +9
We report a neutron diffraction study of single-crystal CePtAl complemented by measurements of the specific heat under applied magnetic field. Below =3 K CePtAl$_…
Spontaneous supercurrent induced by ferromagnetic pi-junctions
A. Bauer, J. Bentner, M. Aprili +4
We present magnetization measurements of mesoscopic superconducting niobium loops containing a ferromagnetic (PdNi) pi-junction. The loops are prepared on top of the active area of…
Surface-electronic structure of La(0001) and Lu(0001)
D. Wegner, A. Bauer, Yu. M. Koroteev +4
Most spectroscopic methods for studying the electronic structure of metal surfaces have the disadvantage that either only occupied or only unoccupied states can be probed, and the…
Symmetry breaking, slow relaxation dynamics, and topological defects at the field-induced helix reorientation in MnSi
A. Bauer, A. Chacon, M. Wagner +4
We report a study of the reorientation of the helimagnetic order in the archetypal cubic chiral magnet MnSi as a function of magnetic field direction. The reorientation process as…
Temporal decay of Neel order in the one-dimensional Fermi-Hubbard model
A. Bauer, F. Dorfner, F. Heidrich-Meisner
Motivated by recent experiments with ultra-cold quantum gases in optical lattices we study the decay of the staggered moment in the one-dimensional Fermi-Hubbard model starting fro…
H-ATLAS/GAMA: The nature and characteristics of optically red galaxies detected at submillimetre wavelengths
A. Dariush, S. Dib, S. Hony +39
We combine Herschel/SPIRE sub-millimeter (submm) observations with existing multi-wavelength data to investigate the characteristics of low redshift, optically red galaxies detecte…
A multi-wavelength exploration of the [CII]/IR ratio in H-ATLAS/GAMA galaxies out to z=0.2
E. Ibar, M. A. Lara-López, R. Herrera-Camus +23
We explore the behaviour of [CII]-157.74um forbidden fine-structure line observed in a sample of 28 galaxies selected from ~50deg^2 of the H-ATLAS survey. The sample is restricted…
The PAU Survey: Narrow-band image photometry
S. Serrano, E. Gaztañaga, F. J. Castander +22
PAUCam is an innovative optical narrow-band imager mounted at the William Herschel Telescope built for the Physics of the Accelerating Universe Survey (PAUS). Its set of 40 filters…
A Raman study of the temperature and magnetic field dependence of electronic and lattice properties in MnSi
H. -M. Eiter, P. Jaschke, R. Hackl +3
The temperature and magnetic field dependence of lattice and carrier excitations in MnSi is studied in detail using inelastic light scattering. The pure symmetry components of the…
Single crystal growth of CeTAl (T = Cu, Ag, Au, Pd and Pt)
C. Franz, A. Senyshyn, A. Regnat +8
We report single crystal growth of the series of CeTAl compounds with T = Cu, Ag, Au, Pd and Pt by means of optical float zoning. High crystalline quality was confirmed in a th…