A superconducting-to-magnetic transition is reported for LaFeAsO 0.89 F 0.11 where a per-thousand amount of Mn impurities is dispersed. By employing local spectroscopic techniques like muon spin rotation (μSR) 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.

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.

Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase diagram of iron-based superconductors / Hammerath, F; Bonfa', P; Sanna, S; Prando, G; De Renzi, R; Kobayashi, Y; Sato, M; Carretta, P. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 89:13(2014), p. 134503. [10.1103/PhysRevB.89.134503]

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

Bonfa' P;
2014

Abstract

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.
2014
89
13
134503
Poisoning effect of Mn in LaFe1-xMnxAsO0.89F0.11: Unveiling a quantum critical point in the phase diagram of iron-based superconductors / Hammerath, F; Bonfa', P; Sanna, S; Prando, G; De Renzi, R; Kobayashi, Y; Sato, M; Carretta, P. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 89:13(2014), p. 134503. [10.1103/PhysRevB.89.134503]
Hammerath, F; Bonfa', P; Sanna, S; Prando, G; De Renzi, R; Kobayashi, Y; Sato, M; Carretta, P
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1369441
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