期刊
PHYSICAL REVIEW B
卷 86, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.140502
关键词
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资金
- Canada Research Chair
- CIFAR
- NSERC
- CFI
- FQRNT
- DOE-Basic Energy Sciences [DE-AC02-07CH11358]
- NSFC
- MOST of China [2011CBA00100]
The electrical resistivity. of the iron-arsenide superconductor Ba1-xKxFe2As2 was measured in applied pressures up to 2.6 GPa for four underdoped samples, with x similar or equal to 0.16, 0.18, 0.19, and 0.21. The antiferromagnetic ordering temperature T-N, detected as a sharp anomaly in rho(T), decreases linearly with pressure. At pressures above P similar or equal to 1.0 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.
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