160 citations · 1.4k across the 30 of their papers we have counts for
25 papers · 1 filter
Nodal line resonance generating the giant anomalous Hall effect of CoSnS
F. Schilberth, M. -C. Jiang, S. Minami +11
Giant anomalous Hall effect (AHE) and magneto-optical activity can emerge in magnets with topologically non-trivial degeneracies. However, identifying the specific band structure f…
Sub-gap optical response across the structural phase transition in van der Waals layered α-RuCl
S. Reschke, F. Mayr, S. Widmann +7
We report magnetic, thermodynamic, thermal expansion, and on detailed optical experiments on the layered compound -RuCl focusing on the THz and sub-gap optical response acro…
Electronic and phonon excitations in α-RuCl
S. Reschke, F. Mayr, Zhe Wang +3
We report on THz, infrared reflectivity and transmission experiments for wave numbers from 10 to 8000 cm ( 1 meV - 1 eV) and for temperatures from 5 to 295 K on the Ki…
Excitations and relaxation dynamics in multiferroic GeV4S8 studied by THz and dielectric spectroscopy
S. Reschke, Zhe Wang, F. Mayr +4
We report on THz time-domain spectroscopy on multiferroic GeV4S8, which undergoes orbital ordering at a Jahn-Teller transition at 30.5 K and exhibits antiferromagnetic order below…
Electromagnons, magnons, and phonons in EuHoMnO
Zhenyu Chen, M. Schmidt, Zhe Wang +5
Here we present a detailed study of the THz and FIR response of the mixed perovskite manganite system EuHoMnO for holmium concentrations x = 0.1 and 0.3. We compare…
Spin-orbiton and quantum criticality in FeSc2S4
L. Mittelstädt, M. Schmidt, Zhe Wang +7
In FeSc2S4 spin-orbital exchange competes with strong spin-orbit coupling, suppressing long-range spin and orbital order and, hence, this material represents one of the rare exampl…
Infrared phonons and specific heat in Ba3Cr2O8
Zhe Wang, M. Schmidt, A. Günther +7
We report on the phonon spectrum of Ba3Cr2O8 determined by infrared spectroscopy, and on specific heat measurements across the Jahn-Teller transition in magnetic fields up to 9 T.…
Wüstite: Electric, thermodynamic and optical properties of FeO
F. Schrettle, Ch. Kant, P. Lunkenheimer +3
We report on a systematic optical investigation of wüstite. In addition, the sample under consideration, Fe0.93O, has been characterized in detail by electrical transport, dielectr…
Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8
Zhe Wang, M. Schmidt, A. Günther +10
We report on the magnetic and phononic excitation spectrum of Sr3Cr2O8 determined by THz and infrared (IR) spectroscopy, and electron spin resonance (ESR) measurements across the J…
Optical phonons, spin correlations, and spin-phonon coupling in the frustrated pyrochlore magnets CdCr2O4 and ZnCr2O4
Ch. Kant, J. Deisenhofer, T. Rudolf +7
We report on infrared, Raman, magnetic susceptibility, and specific heat measurements on CdCr2O4 and ZnCr2O4 single crystals. We estimate the nearest-neighbor and next-nearest neig…
Far-infrared optical excitations in multiferroic TbMnO_3
M. Schmidt, Ch. Kant, T. Rudolf +5
We provide a detailed study of the reflectivity of multiferroic TbMnO_3 for wave numbers from 40 cm^{-1} to 1000 cm^{-1} and temperatures 5 K < T < 300 K. Excitations are studied f…
Optical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations
Ch. Kant, T. Rudolf, F. Schrettle +5
The reflectivity of single-crystalline CoO has been studied by optical spectroscopy for wave numbers ranging from 100 to 28,000\wn and for temperatures 8 325 K\@. A splitti…
Optical properties of ZnCr2Se4 - Spin-phonon coupling and electronic d-d-like excitations
T. Rudolf, Ch. Kant, F. Mayr +4
We studied the optical properties of antiferromagnetic ZnCr2Se4 by infrared spectroscopy up to 28,000 cm-1 and for temperatures from 5 to 295 K. At the magnetic phase transition at…
Broadband dielectric response of CaCu3Ti4O12: From dc to the electronic transition regime
Ch. Kant, T. Rudolf, F. Mayr +4
We report on phonon properties and electronic transitions in CaCu3Ti4O12, a material which reveals a colossal dielectric constant at room temperature without any ferroelectric tran…
Polar phonons and spin-phonon coupling in HgCr2S4 and CdCr2S4
T. Rudolf, Ch. Kant, F. Mayr +3
Polar phonons of HgCr2S4 and CdCr2S4 are studied by far-infrared spectroscopy as a function of temperature and external magnetic field. Eigenfrequencies, damping constants, effecti…
Magnetic-order induced phonon splitting in MnO from far-infrared spectroscopy
T. Rudolf, Ch. Kant, F. Mayr +1
Detailed far-infrared spectra of the optical phonons are reported for antiferromagnetic MnO. Eigenfrequencies, phonon damping and effective plasma frequencies are studied as a func…
Spin-phonon coupling in antiferromagnetic chromium spinels
T. Rudolf, Ch. Kant, F. Mayr +3
The temperature dependence of eigenfrequencies and intensities of the IR active modes has been investigated for the antiferromagnetic chromium spinel compounds CdCr2O4, ZnCr2O4, Zn…
Spin-phonon coupling in ZnCr2Se4
T. Rudolf, Ch. Kant, F. Mayr +3
Spin-phonon coupling and magnetodielectric effects of ZnCr2Se4 were investigated by means of infrared (IR) spectroscopy as a function of temperature and magnetic field. ZnCr2Se4 is…
Coupling of phonons and electromagnons in GdMnO_3
A. Pimenov, T. Rudolf, F. Mayr +3
The infrared and Terahertz properties of GdMnO_3 have been investigated as function of temperature and magnetic field, with special emphasis on the phase boundary between the incom…
Spin-driven Phonon Splitting in Bond-frustrated ZnCr2S4
J. Hemberger, T. Rudolf, H. -A. Krug von Nidda +4
Utilizing magnetic susceptibility, specific heat, thermal expansion and IR spectroscopy we provide experimental evidence that the two subsequent antiferromagnetic transitions in Zn…
Dynamic conductivity of semiconducting manganites approaching the metal-insulator transition
P. Lunkenheimer, F. Mayr, A. Loidl
We report the frequency-dependent conductivity of the manganite system La1-xSrxMnO3 (x <= 0.2) when approaching the metal-insulator transition from the insulating side. Results fro…
Unusual Non-Fermi Liquid Behavior of CeLaNiGe Analyzed in a Single Impurity Anderson Model with Crystal Field Effects
E. -W. Scheidt, F. Mayr, U. Killer +6
CeNiGe exhibits unusual non-Fermi liquid behavior with the largest ever recorded value of the electronic specific heat JKmol without showin…
Phonon anomalies and charge dynamics in Fe_{1-x}Cu_{x}Cr_{2}S_{4} single crystals
T. Rudolf, K. Pucher, F. Mayr +5
A detailed investigation of phonon excitations and charge carrier dynamics in single crystals of Fe_{1-x}Cu_{x}Cr_{2}S_{4} (x = 0, 0.2, 0.4, 0.5) has been performed by using infrar…
Polaronic excitations in CMR manganite films
Ch. Hartinger, F. Mayr, A. Loidl +1
In the colossal magnetoresistance manganites polarons have been proposed as the charge carrier state which localizes across the metal-insulator transition. The character of the pol…