K. Kliemt

Field-tuned quasiparticles and electronic structure in heavy-fermion YbNi4P2

Will Broad, Owen Moulding, Takaki Muramatsu +7

We study the Fermi surface topology and quasiparticle properties in the heavy fermion compound YbNi4P2 at high magnetic fields using quantum oscillation measurements. We observe a…

Photoemission insights into lanthanide-based crystals

Dmitry Yu. Usachov, Georg Poelchen, Vasily S. Stolyarov +3

The interplay of strongly localized 4 $f$ electrons with itinerant spd-valence states gives rise to a wide range of correlated phenomena and properties that place lanthanide materia…

cond-mat.mtrl-sci2026

Giant thermopower changes related to the resistivity maximum and colossal magnetoresistance in EuCd2P2

Judith Grafenhorst, Sarah Krebber, Kristin Kliemt +3

We present the thermopower of EuCd2P2, a material which exhibits a large resistivity peak with significant magnetic field dependence in the temperature range of 10-25 K. In the sam…

Single crystal growth and properties of Au- and Ge-substituted EuPd $_{2}$ Si $_{2}$

Michelle Ocker, Robert Möller, Marius Peters +7

We report on the single crystal growth of Eu(Pd $_{1 - x}$ Au $_{x}$ ) $_{2}$ Si $_{2}$ , $0 < x \leq 0.2$ , from a levitating Eu-rich melt using the Czochralski method. Our structural analysis of th…

Acoustic signatures of the field-induced electronic-topological transitions in YbNi $_{4}$ P $_{2}$

E. -O. Eljaouhari, B. V. Schwarze, K. Kliemt +6

We investigated the magnetoelastic properties of an YbNi $_{4}$ P $_{2}$ single crystal at low temperatures under magnetic fields directed along the crystallographic [001] axis. We report…

Growth-Controlled Twinning and Magnetic Anisotropy in CeSb $_{2}$

Jan T. Weber, Kristin Kliemt, Sergey L. Bud'ko +2

Cerium diantimonide (CeSb $_{2}$ ) is a layered heavy-fermion Kondo lattice material that hosts complex magnetism and pressure-induced superconductivity. The interpretation of its in-p…

Competing magnetic order in EuPd $_{3}$ Si $_{2}$

Michelle Ocker, Franziska Walther, Nour Maraytta +4

Single crystals of EuPd $_{3}$ Si $_{2}$ were grown using a high-temperature EuPd-flux method. The material was structurally and chemically characterized by single-crystal x-ray diffracti…

Symmetric versus antisymmetric strain tuning of the valence transition in Yb(In $_{1 - x}$ Ag $_{x}$ )Cu $_{4}$

Caitlin I. O'Neil, Michelle Ocker, Kristin Kliemt +2

Similar to transitions in a range of correlated quantum materials, the valence transition exhibits a strong coupling to the crystal lattice, rendering it highly sensitive to stress…

Electron Spin Resonance of Eu on triangular layers in EuT2P2 (T =Mn, Zn, Cd)

Jörg Sichelschmidt, Pierre Chailloleau, Sarah Krebber +3

We report on the electron spin resonance (ESR) of Eu $^{2 +}$ in Eu $T_{2}$ P $_{2}$ ( $T$ =Mn, Zn, Cd) single crystals. The temperature dependencies of ESR linewidth and resonance shift…

Towards a critical endpoint in the valence fluctuating Eu(Rh $_{1 - x}$ Co $_{x}$ ) $_{2}$ Si $_{2}$ system

Franziska Walther, Michelle Ocker, Alexej Kraiker +4

We report on the successful single crystal growth of pure EuRh $_{2}$ Si $_{2}$ and of Eu(Rh $_{1 - x}$ Co $_{x}$ ) $_{2}$ Si $_{2}$ with $x \leq 0.23$ by the flux method. Through Co substitution, E…

cond-mat.str-el2025★ 1 cited

Robust Magnetic Polaron Percolation in the Antiferromagnetic CMR System EuCd $_{2}$ P $_{2}$

Marvin Kopp, Charu Garg, Sarah Krebber +16

Antiferromagnetic EuCd $_{2}$ P $_{2}$ has attracted considerable attention due to its unconventional (magneto)transport properties. At a temperature $T_{peak}$ significantly above th…

Electronic structure dimensionality of the quantum-critical ferromagnet YbNi $_{4}$ P $_{2}$

J. Dai, A. Antezak, W. Broad +15

YbNi $_{4}$ P $_{2}$ is the first known ferromagnetic metal showing a second-order quantum phase transition. Current theoretical understanding rules out second order ferromagnetic quantum…

cond-mat.supr-con2025

Odd-parity superconductivity underpinned by antiferromagnetism in heavy fermion metal YbRh $_{2}$ Si $_{2}$

Lev V. Levitin, Jan Knapp, Petra Knappová +13

Topological superconductors are essential elements of the periodic table of topological quantum matter. However, the relevant odd-parity spin-triplet superconductors are rare. We r…

Single crystal growth and physical characterization to fine tune YbIn1-xTxCu4 (T = Au, Ag) towards the critical endpoint of the valence transition

Michelle Ocker, Bereket Ghebretinsae, Jan-Niklas Zimmermann +6

Pure as well as Ag- and Au-substituted YbInCu $_{4}$ single crystals were structurally and chemically characterized and investigated by means of heat capacity, magnetization, resistiv…

Magnetic frustration and weak Mn magnetic ordering in EuMn $_{2}$ P $_{2}$

Sarah Krebber, Jörg Sichelschmidt, Pierre Chailloleau +8

We report on the electron spin resonance (ESR), heat capacity, magnetization, nuclear magnetic resonance (NMR), magnetic circular and linear dichroism (XMCD, XMLD), as well as the…

Magnetic Phase Diagram of YbRh\textsubscript{2}Si\textsubscript{2}: the Influence of Hyperfine Interactions

Jan Knapp, Lev V. Levitin, Jan Nyeki +6

We report the determination of the magnetic phase diagram of the heavy fermion metal YbRh\textsubscript{2}Si\textsubscript{2} in magnetic fields up to 70\,mT applied perpendicular…

Discovery of an intrinsic non-Hermitian phase transition in a bulk condensed-matter system

Jingwen Li, Michael Turaev, Masakazu Matsubara +5

Across regular phase transitions, systems remain in thermal equilibrium. However, when a system is driven far from equilibrium, non-Hermitian phase transitions may arise where the…

The electronic structure of EuPd $_{2}$ Si $_{2}$ in the vicinity of the critical endpoint

O. Fedchenko, Y. -J. Song, O. Tkach +10

Hard X-ray angle-resolved photoemission spectroscopy reveals significant alterations in the valence band states of EuPd $_{2}$ Si $_{2}$ at a temperature $T_{V}$ , where the Eu ions undergo…

Physical properties of the ferromagnetic quantum critical system YbNi $_{4}$ (P $_{1 - x}$ As $_{x}$ ) $_{2}$

Kristin Kliemt, Jacintha Banda, Pavlo Khanenko +6

We report on single crystal growth and physical properties of the quantum critical Kondo-lattice system YbNi $_{4}$ (P $_{1 - x}$ As $_{x}$ ) $_{2}$ with $0 \leq x \leq 1$ which hosts a ferromagn…

Chemical pressure due to impurities in trigonal compounds Eu $T_{2} P n_{2}$ ( $T =$ Cd, Zn; $P n =$ P, As, Sb)

Kristin Kliemt

This work provides a review of crystal growth, crystal structure, compositional details, magnetism, thermodynamic, and transport behavior in the family of the trigonal intermetalli…

cond-mat.mtrl-sci2024

Controlling 4f antiferromagnetic dynamics via itinerant electronic susceptibility

Sang-Eun Lee, Yoav William Windsor, Daniela Zahn +10

Optical manipulation of magnetism holds promise for future ultrafast spintronics, especially with lanthanides and their huge, localized 4f magnetic moments. These moments interact…