Pressure-induced magnetic transition and volume collapse in FeAs superconductors: An orbital-selective Mott scenario
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Contributors
Abstract
Motivated by pressure experiments on café2As2, we propose a scenario based on local-moment physics to explain the simultaneous disappearance of magnetism, reduction of the unit cell volume, and decrease in resistivity. In this scenario, the low-pressure magnetic phase derives from Fe moments, which become screened in the paramagnetic high-pressure phase. The quantum phase transition can be described as an orbital-selective Mott transition, which is rendered first order by coupling to the lattice, in analogy to a Kondo volume collapse. Spin-fluctuation driven superconductivity competes with antiferromagnetism and may be stabilized at low temperatures in the highpressure phase. The ideas are illustrated by a suitable mean-field analysis of an Anderson lattice model.
Details
Original language | English |
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Article number | 055064 |
Journal | New journal of physics |
Volume | 11 |
Publication status | Published - 29 May 2009 |
Peer-reviewed | Yes |
Externally published | Yes |