P
Philipp Gegenwart
Researcher at University of Augsburg
Publications - 362
Citations - 14781
Philipp Gegenwart is an academic researcher from University of Augsburg. The author has contributed to research in topics: Quantum critical point & Antiferromagnetism. The author has an hindex of 55, co-authored 338 publications receiving 12885 citations. Previous affiliations of Philipp Gegenwart include University of Göttingen & Augsburg College.
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Quantum criticality in heavy-fermion metals
TL;DR: In this paper, the authors summarize some of the basic issues, including the extent to which the quantum criticality in heavy-fermion metals goes beyond the standard theory of order-parameter fluctuations, the nature of the Kondo effect in the quantum-critical regime, the non-Fermi-liquid phenomena that accompany quantum criticalities and the interplay between quantum criticalness and unconventional superconductivity.
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The break-up of heavy electrons at a quantum critical point
J. Custers,Philipp Gegenwart,Heribert Wilhelm,K. Neumaier,Yoshifumi Tokiwa,O. Trovarelli,C. Geibel,Frank Steglich,Catherine Pépin,Piers Coleman +9 more
TL;DR: It is inferred that all ballistic motion of electrons vanishes at a QCP, forming a new class of conductor in which individual electrons decay into collective current-carrying motions of the electron fluid.
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Relevance of the Heisenberg-Kitaev model for the honeycomb lattice iridates A2IrO3.
Yogesh Singh,Yogesh Singh,Soham Manni,Johannes Reuther,Johannes Reuther,Tom Berlijn,Tom Berlijn,Ronny Thomale,Wei Ku,Wei Ku,Simon Trebst,Philipp Gegenwart +11 more
TL;DR: It is estimated that Na2 IrO3 is deep in a magnetically ordered regime, while Li2IrO3 appears to be close to a spin-liquid regime.
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Models and materials for generalized Kitaev magnetism.
Stephen M. Winter,Alexander A. Tsirlin,Maria Daghofer,Jeroen van den Brink,Yogesh Singh,Philipp Gegenwart,Roser Valentí +6 more
TL;DR: The mechanism proposed by Jackeli and Khaliullin to identify Kitaev materials based on spin-orbital dependent bond interactions is analyzed and a comprehensive overview of its implications in real materials is provided.
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YbRh 2 Si 2 : Pronounced Non-Fermi-Liquid Effects above a Low-Lying Magnetic Phase Transition
O. Trovarelli,C. Geibel,S. Mederle,C. Langhammer,F. M. Grosche,Philipp Gegenwart,Michael Lang,G. Sparn,Frank Steglich +8 more
TL;DR: In this article, the first observation of non-Fermi-liquid effects in a clean Yb compound at ambient pressure and zero magnetic field was reported, and the authors ascribe this NFL behavior to the presence of quasi-2D antiferromagnetic spin fluctuations related to a very weak magnetic phase transition at T(N) approximately 65 mK.