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Kondo coherence versus superradiance in THz radiation-driven heavy-fermion systems
Chia-Jung Yang, Michael Woerner, Oliver Stockert +4
In strongly correlated systems such as heavy-fermion materials, the coherent superposition of localized and mobile spin states leads to the formation of Kondo resonant states, whic…
Terahertz Conductivity of Heavy-fermion Systems from Time-resolved Spectroscopy
Chia-Jung Yang, Shovon Pal, Farzaneh Zamani +6
The Drude model describes the free-electron conduction in simple metals, governed by the freedom that the mobile electrons have within the material. In strongly correlated systems,…
Evolution of the partially frustrated magnetic order in CePdNiAl
Zita Huesges, Stefan Lucas, Sarah Wunderlich +8
We report on a single-crystal neutron diffraction study of the evolution of the antiferromagnetic order in the heavy-fermion compound CePdNiAl which exhibits partial ge…
Entropy evolution in the magnetic phases of partially frustrated CePdAl
Stefan Lucas, Kai Grube, Chien-Lung Huang +8
In the heavy-fermion metal CePdAl long-range antiferromagnetic order coexists with geometric frustration of one third of the Ce moments. At low temperatures the Kondo effect tends…
CePdAl - a Kondo lattice with partial frustration
Veronika Fritsch, Stefan Lucas, Zita Huesges +10
Magnetic frustration, which is well-defined in insulating systems with localized magnetic moments, yields exotic ground states like spin ices, spin glasses, or spin liquids. In met…
Signature of frustrated moments in quantum critical CePdNiAl
Akito Sakai, Stefan Lucas, Philipp Gegenwart +3
CePdAl with Ce moments forming a distorted kagomé network is one of the scarce materials exhibiting Kondo physics and magnetic frustration simultaneously. As a result, antifer…
Anomalous Microwave Surface Resistance of CeCu6
Daniel Hafner, Martin Dressel, Oliver Stockert +3
We present surface resistance measurements of the archetypical heavy-fermion compound CeCu6 for frequencies between 3.7 and 18 GHz and temperatures from 1.2 to 6 K. The measurement…
Approaching quantum criticality in a partially geometrically frustrated heavy-fermion metal
V. Fritsch, N. Bagrets, G. Goll +5
Quantum phase transitions have captured the interest of a large community in condensed-matter and atom physics research. The common feature of these very different material classes…
Magnetic properties of single-crystalline CeCuGa3
Devang A. Joshi, P. Burger, P. Adelmann +7
The magnetic behavior of single-crystalline CeCuGa3 has been investigated. The compound forms in a tetragonal BaAl4-type structure consisting of rare-earth planes separated by Cu-G…
Strongly Anisotropic Magnetic Phase Diagram of CeAu2Ge2
V. Fritsch, P. Pfundstein, P. Schweiss +3
CeAu2Ge2 single crystals (tetragonal ThCr2Si2 structure) have been grown in Au-Ge flux (AGF) as well as in Sn flux (SF). X-ray powder-diffraction and EDX measurements indicate that…
Magnetic Blue Phase in the Chiral Itinerant Magnet MnSi
A. Hamann, D. Lamago, Th. Wolf +2
Chiral nematic liquid crystals sometimes form blue phases characterized by spirals twisting in different directions. By combining model calculations with neutron-scattering experim…
Complex magneto-elastic properties in the frustrated kagome-staircase compounds (CoNi)VO
Q. Zhang, W. Knafo, P. Adelmann +6
High resolution heat capacity and thermal expansion experiments performed on single crystalline kagome-staircase compounds (CoNi)VO are presented. The paren…
Soft x-ray magnetic circular dichroism of LaCoO, LaCeCoO, and LaSrCoO films: Evidence for Co valency-dependent magnetism and magnetic anisotropy
M. Merz, P. Nagel, C. Pinta +7
Epitaxial thin films of undoped LaCoO\@, of electron-doped LaCeCoO\@, and of hole-doped LaSrCoO\@ exhibit ferromagnetic order with…
Resistivity of MnFeSi single crystals: Evidence for quantum critical behavior
C. Meingast, Q. Zhang, Th. Wolf +6
Resistivity measurements have been made on MnFeSi single crystals between 2 and 300K for = 0, 0.05, 0.08, 0.12 and 0.15. Fe doping is found to depress the magnetic…
Critical Scaling of the Magnetization and Magnetostriction in the Weak Itinerant Ferromagnet UIr
W. Knafo, C. Meingast, S. Sakarya +5
The weak itinerant ferromagnet UIr is studied by magnetization and magnetostriction measurements. Critical behavior, which surprisingly extends up to several Tesla, is observed at…
High Resolution Photoemission Study on Low-T_K Ce Systems: Kondo Resonance, Crystal Field Structures, and their Temperature Dependence
D. Ehm, S. H"ufner, F. Reinert +5
We present a high-resolution photoemission study on the strongly correlated Ce-compounds CeCu_6, CeCu_2Si_2, CeRu_2Si_2, CeNi_2Ge_2, and CeSi_2. Using a normalization procedure bas…
Signature of Electronic Correlations in the Optical Conductivity of the Doped Semiconductor Si:P
Marco Hering, Marc Scheffler, Martin Dressel +1
Electronic transport in highly doped but still insulating silicon at low temperatures is dominated by hopping between localized states; it serves as a model system of a disordered…
Fermi-liquid instabilities at magnetic quantum phase transitions
Hilbert v. Löhneysen, Achim Rosch, Matthias Vojta +1
This review discusses instabilities of the Fermi-liquid state of conduction electrons in metals with particular emphasis on magnetic quantum critical points. Both the existing theo…
Suppression of ferromagnetism in CeSi_1.81 under temperature and pressure
S. Drotziger, C. Pfleiderer, M. Uhlarz +4
We have studied the pressure dependence of the magnetization of single crystalline CeSi_1.81. At ambient pressure ferromagnetism develops below T_C = 9.5 Below ~ 5 K an additional…
Magnetic order and transport in the heavy-fermion system CeCu_{6-x}Au_x
H. v. Löhneysen, A. Neubert, A. Schröder +5
We report on extensive elastic neutron scattering to determine the wave vector of the magnetic order in CeCu_{6-x}Au_x single crystals for x > 0.1. For all values of x investigated…