期刊
PHYSICAL REVIEW B
卷 85, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.140512
关键词
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资金
- ICAM
- NSF-DMR [0645461, 0955500, 0906953]
- NSF [OISE-0968226]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0645461] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [906953, 0955500, 844115] Funding Source: National Science Foundation
We analyze how disorder affects the transition temperature T-c of the s(+-) superconducting state in the iron pnictides. The conventional wisdom is that T-c should rapidly decrease with increasing inter-band nonmagnetic impurity scattering, but we show that this behavior holds only in the overdoped region of the phase diagram. In the underdoped regime, where superconductivity emerges from a pre-existing magnetic state, disorder gives rise to two competing effects: breaking of the Cooper pairs, which tends to reduce T-c, and suppression of the itinerant magnetic order, which tends to bring T-c up. We show that for a wide range of parameters the second effect wins; i.e., in the coexistence state T-c can increase with disorder. Our results provide an explanation for several recent experimental findings and lend additional support to s(+-) pairing in the iron pnictides.
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