Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba 1-xK xFe 2As 2: Evidence of a phase transition inside the antiferromagnetic phase
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Contributors
Abstract
The electrical resistivity ρ of the iron-arsenide superconductor Ba 1-xK xFe 2As 2 was measured in applied pressures up to 2.6 GPa for four underdoped samples, with x0.16, 0.18, 0.19, and 0.21. The antiferromagnetic ordering temperature T N, detected as a sharp anomaly in ρ(T), decreases linearly with pressure. At pressures above P1.0 GPa, a second sharp anomaly is detected at a lower temperature T 0, which rises with pressure. We attribute this second anomaly to the onset of a phase that causes a reconstruction of the Fermi surface. The new phase expands with increasing x and it competes with superconductivity. We discuss the possibility that a second spin-density wave orders at T 0, with a Q vector distinct from that of the spin-density wave that sets in at T N.
Details
Original language | English |
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Article number | 140502 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 86 |
Issue number | 14 |
Publication status | Published - 18 Oct 2012 |
Peer-reviewed | Yes |
Externally published | Yes |