Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase diagram of iron-based superconductors

被引：30

作者：

Hammerath, F. ^{[1
,2
]}

Bonfa, P. ^{[3
,4
]}

Sanna, S. ^{[1
,2
]}

Prando, G. ^{[1
,2
]}

De Renzi, R. ^{[3
,4
]}

Kobayashi, Y. ^{[5
]}

Sato, M. ^{[5
]}

Carretta, P. ^{[1
,2
]}

机构：

[1] Univ Pavia, Dipartimento Fis, I-27100 Pavia, Italy

[2] Unita CNISM Pavia, I-27100 Pavia, Italy

[3] Dipartimento Fis, I-43124 Parma, Italy

[4] Unita CNISM Parma, I-43124 Parma, Italy

[5] Nagoya Univ, Dept Phys, Div Mat Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 89卷 / 13期

关键词：

RELAXATION; TC;

D O I：

10.1103/PhysRevB.89.134503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A superconducting-to-magnetic transition is reported for LaFeAsO0.89F0.11 where a per-thousand amount of Mn impurities is dispersed. By employing local spectroscopic techniques like muon spin rotation (mu SR) and nuclear quadrupole resonance (NQR) on compounds with Mn contents ranging from x = 0.025% to x = 0.75 %, we find that the electronic properties are extremely sensitive to the Mn impurities. In fact, a small amount of Mn as low as 0.2% suppresses superconductivity completely. Static magnetism, involving the FeAs planes, is observed to arise for x > 0.1% and becomes further enhanced upon increasing Mn substitution. Also a progressive increase of low-energy spin fluctuations, leading to an enhancement of the NQR spin-lattice relaxation rate T-1(-1), is observed upon Mn substitution. The analysis of T-1(-1) for the sample closest to the crossover between superconductivity and magnetism (x = 0.2%) points toward the presence of an antiferromagnetic quantum critical point around that doping level.

引用

页数：10

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