Volume 127, Number 5, September 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 October 2019|
Quantum ferromagnetic transition in clean Dirac metals
1 Institute for Physical Science and Technology, University of Maryland - College Park, MD 20742, USA
2 Department of Physics and Institute of Theoretical Science, University of Oregon - Eugene, OR 97403, USA
3 Materials Science Institute, University of Oregon - Eugene, OR 97403, USA
Received: 13 September 2019
Accepted: 16 September 2019
The ferromagnetic quantum phase transition in clean metals with a negligible spin-orbit interaction is known to be first order due to a coupling of the magnetization to soft fermionic particle-hole excitations. A spin-orbit interaction gives these excitations a mass, suggesting the existence of a ferromagnetic quantum-critical point in metals with a strong spin-orbit interaction. We show that this expectation is not borne out in a large class of materials with a Dirac spectrum, since the chirality degree of freedom leads to new soft modes that again render the transition first order.
PACS: 71.10.-w – Theories and models of many-electron systems / 73.43.Nq – Quantum phase transitions / 71.70.Ej – Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
© EPLA, 2019
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