A5027854211- Magnetic properties of thin films
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Topological Materials and Phenomena
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties of Alloys
- Organic and Molecular Conductors Research
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Magneto-Optical Properties and Applications
- Molecular spectroscopy and chirality
- Quantum and electron transport phenomena
- Electronic and Structural Properties of Oxides
- Thermal properties of materials
Helmholtz-Zentrum Dresden-Rossendorf
2022-2025
Observations of the anomalous Hall effect in RuO2 and MnTe have demonstrated unconventional time-reversal symmetry breaking electronic structure a recently identified new class compensated collinear magnets, dubbed altermagnets. While MnTe, signal accompanied by vanishing magnetization is observable at remanence, excluded for Néel vector pointing along zero-field [001] easy-axis. Guided analysis ab initio calculations, field-induced reorientation from easy-axis toward [110] hard-axis was...
Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi>CeRh</a:mi><a:mn>2</a:mn></a:msub><a:msub><a:mi>As</a:mi><a:mn>2</a:mn></a:msub></a:mrow></a:math> (<b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msub><b:mi>T</b:mi><b:mtext>c</b:mtext></b:msub><b:mo> </b:mo><b:mo>≈</b:mo><b:mn>0.31</b:mn></b:math> K)....
Recently, MnTe was established as an altermagnetic material that hosts spin-polarized electronic bands well anomalous transport effects like the Hall effect. In addition to these arising from altermagnetism, also other magnetoresistance effects. Here, we study manipulation of magnetic order by applied field and its impact on electrical resistivity. particular, establish which components anisotropic are present when is rotated within hexagonal basal plane. Our experimental results, in...
We report the magnetoelastic properties of a Ba$_2$CuGe$_2$O$_7$ single crystal at low temperatures under magnetic field applied along crystallographic [001] axis. Our results extend to temperature $H-T$ phase diagram determined for this compound by neutron scattering. Furthermore, we observe that specific elastic modes are better sensitive various transitions. In particular, an unusual coupling between in-plane transverse acoustic mode and cycloidal order field, which suggests novel...
Oscillations of conductance observed in strong magnetic fields are a striking manifestation the quantum dynamics charge carriers solids. The large carrier density typical metals sets scale oscillations both electrical and thermal conductivity, which characterize Fermi surface. In semimetals, transport at low-charge is expected to be phonon dominated, yet several experiments observe giant transport. This raises question whether there an overarching mechanism leading sizable that survives...
We report an extensive high-field study of atacamite <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mrow><a:msub><a:mrow><a:mi>Cu</a:mi></a:mrow><a:mrow><a:mn>2</a:mn></a:mrow></a:msub></a:mrow><a:mi>Cl</a:mi><a:msub><a:mrow><a:mo stretchy="false">(</a:mo><a:mrow><a:mi>OH</a:mi></a:mrow><a:mo stretchy="false">)</a:mo></a:mrow><a:mrow><a:mn>3</a:mn></a:mrow></a:msub></a:mrow></a:math>, a material realization quantum sawtooth chains with weak interchain...
We report on the temperature dependence of spatially modulated spin-polarization amplitude $\mathrm{\ensuremath{\Delta}}{K}_{\text{spin}}$, which is a hallmark superconducting Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. For that, we use $^{13}\mathrm{C}$ nuclear magnetic resonance (NMR) spectroscopy performed organic conductor ${\ensuremath{\beta}}^{\ensuremath{'}\ensuremath{'}}\text{\ensuremath{-}}{(\mathrm{ET})}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$....
Abstract The interface of common III‐V semiconductors InAs and GaSb can be utilized to realize a two‐dimensional (2D) topological insulator state. 2D electronic gas at this yield Hall quantization from coexisting electrons holes. This anomaly is determining factor in the fundamental origin state InAs/GaSb. Here, coexistence holes InAs/GaSb tied chemical sharpness interface. Magnetotransport, samples Mn‐doped cleaved wafers grown spatially inhomogeneous substrate temperature, studied. It...
The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state can emerge in superconductors for which the orbital critical field exceeds Pauli limit. Here, we present angular-resolved specific-heat data of quasi-two-dimensional organic superconductor $\kappa$-(ET)$_2$Cu(NCS)$_2$, with a focus on high fields regime FFLO transition. For an increasing out-of-plane tilt applied magnetic field, leads to increase contributions, found that nature superconducting transition changes from second first order and...
Observations of the anomalous Hall effect in RuO$_2$ and MnTe have demonstrated unconventional time-reversal symmetry breaking electronic structure a recently identified new class compensated collinear magnets, dubbed altermagnets. While signal accompanied by vanishing magnetization is observable at remanence, excluded for N\'eel vector pointing along zero-field [001] easy-axis. Guided analysis ab initio calculations, field-induced reorientation from easy-axis towards [110] hard-axis was...
Recently, MnTe was established as an altermagnetic material that hosts spin-polarized electronic bands well anomalous transport effects like the Hall effect. In addition to these arising from altermagnetism, also other magnetoresistance effects. Here, we study manipulation of magnetic order by applied field and its impact on electrical resistivity. particular, establish which components anisotropic are present when is rotated within hexagonal basal plane. Our experimental results, in...
Unconventional superconductivity in heavy-fermion systems appears often near magnetic quantum critical points (QCPs). This seems to be the case also for CeRh2As2 (Tc $\approx$ 0.31 K). shows two superconducting (SC) phases, SC1 and SC2, a field along c axis of tetragonal unit cell, but only phase is observed basal plane. Furthermore, another ordered state (phase-I) below T0 0.48 K whose nature still unclear: Thermodynamic measurements pointed non multipolar state, recent $\mu$SR NQR/NMR...
We report an extensive high-field study of atacamite Cu$_2$Cl(OH)$_3$, a material realization quantum sawtooth chains with weak interchain couplings, in continuous and pulsed magnetic fields up to 58 T. In particular, we have mapped the entropy landscape for as high 35 T identified field-induced critical point at 21.9(1) $\mathbf{H} \parallel c$ axis. The separates field regions without order, evidenced by our thermodynamic $^1$H nuclear resonance spectroscopy, but lies far below full...