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Start Over Author "U. Ahlheim" Journal zeitschrift f�r physik b condensed matter
4 results on '"U. Ahlheim"'

1. A new heavy-fermion superconductor: UNi2Al3

Author

A. Grauel, B. Seidel, U. Ahlheim, K. Petersen, Dariusz Kaczorowski, Stephan Thies, Frank Steglich, C. D. Bredl, Christoph Geibel, A. Mehner, and R. Helfrich

Subjects
Superconductivity, Materials science, Condensed matter physics, High Energy Physics::Lattice, Type-I superconductor, Heavy fermion superconductor, Condensed Matter Physics, Magnetic susceptibility, Electronic, Optical and Magnetic Materials, Electrical resistivity and conductivity, Magnet, General Materials Science, Anomaly (physics), Critical field
Abstract

Measurements of the resistivity, susceptibility and specific heat are reported which clearly show that the hexagonal compound UNi2Al3 is a heavy-fermion magnet belowT N=4.6 K and a heavy-fermion superconductor belowT c=1 K.

Published
1991
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2. Heavy-fermion superconductivity atT c =2K in the antiferromagnet UPd2Al3

Author

A. Grauel, M. Rau, Christoph Geibel, R. Helfrich, U. Ahlheim, Frank Steglich, Stephan Thies, R. Caspary, A. Böhm, C. Schank, G. Weber, C. D. Bredl, and H. Kitazawa

Subjects
Superconductivity, Physics, Paramagnetism, Condensed matter physics, Phase (matter), Heavy fermion, Antiferromagnetism, Condensed Matter::Strongly Correlated Electrons, General Materials Science, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Abstract

UPd2Al3 is a new heavy-fermion superconductor with a recordTc of 2 K. In addition, it shows a transition to long-range antiferromagnetic order atTN=14 K. Its Sommerfeld coefficient is reduced from γp=210mJ/K2 mole in the paramagnetic to γ0=150mJ/K2 mole in the antiferromagnetic phase.

Published
1991
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4. Upper critical magnetic fields of the heavy fermion superconductors CeCu2Si2, UPt3, and UBe13: Comparison between experiment and theory

Author

U. Rauchschwalbe, U. Ahlheim, D. Rainer, Frank Steglich, and J.J.M. Franse

Subjects
Superconductivity, Physics, Flux pumping, Condensed matter physics, Type-I superconductor, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Magnetic field, Condensed Matter::Superconductivity, Heavy fermion, General Materials Science, Crystallite, Single crystal, Type-II superconductor
Abstract

We report measurements of the upper critical magnetic field,Bc2(T), on single crystal and polycrystalline samples of the heavy-fermion superconductors CeCu2Si2, UPt3 and UBe13. Comparison is made with experimental results for a “conventional” superconductor (CeRu3Si2) and with results of the weak-coupling theory applied to both ans-wave superconductor in the “dirty-limit” and ap-wave superconductor. New anomalies are discovered to add to the unusualBc2(T) behavior.

Published
1985
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