The deliberate insertion of magnetic Mn dopants in the Fe sites of the optimally doped SmFeAsO_0.88F _0.12 iron-based superconductor can modify in a controlled way its electronic properties. The resulting phase diagram was investigated across a wide range of manganese contents (x) by means of muon-spin spectroscopy (μSR), both in zero and in transverse fields, to probe the magnetic and the superconducting order, respectively. The pure superconducting phase (at x < 0.03) is replaced by a crossover region at intermediate Mn values (0.03 x < 0.08), where superconductivity coexists with static magnetic order. After completely suppressing superconductivity for x = 0.08, a further increase in Mn content reinforces the natural tendency towards antiferromagnetic correlations among the magnetic Mn ions. The sharp drop of T c and the induced magnetic order in the presence of magnetic disorder/dopants, such as Mn, are both consistent with a recent theoretical model of unconventional superconductors (M. N. Gastiasoro et al., Phys. Rev. Lett. 117, 257002 (2016)), which includes correlation-enhanced RKKY couplings between the impurity moments.

Role of magnetic dopants in the phase diagram of Sm 1111 pnictides: The case of Mn / Lamura, G.; Shiroka, T.; Bordignon, Sara; Sanna, S.; Moroni, M.; DE RENZI, Roberto; Carretta, P.; Biswas, P. K.; Caglieris, F.; Putti, M.; Wurmehl, S.; Singh, S. J.; Shimoyama, J.; Gastiasoro, M. N.; Andersen, B. M.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 94:21(2016), pp. 214517-1-214517-9. [10.1103/PhysRevB.94.214517]

Role of magnetic dopants in the phase diagram of Sm 1111 pnictides: The case of Mn

BORDIGNON, Sara;DE RENZI, Roberto;
2016-01-01

Abstract

The deliberate insertion of magnetic Mn dopants in the Fe sites of the optimally doped SmFeAsO_0.88F _0.12 iron-based superconductor can modify in a controlled way its electronic properties. The resulting phase diagram was investigated across a wide range of manganese contents (x) by means of muon-spin spectroscopy (μSR), both in zero and in transverse fields, to probe the magnetic and the superconducting order, respectively. The pure superconducting phase (at x < 0.03) is replaced by a crossover region at intermediate Mn values (0.03 x < 0.08), where superconductivity coexists with static magnetic order. After completely suppressing superconductivity for x = 0.08, a further increase in Mn content reinforces the natural tendency towards antiferromagnetic correlations among the magnetic Mn ions. The sharp drop of T c and the induced magnetic order in the presence of magnetic disorder/dopants, such as Mn, are both consistent with a recent theoretical model of unconventional superconductors (M. N. Gastiasoro et al., Phys. Rev. Lett. 117, 257002 (2016)), which includes correlation-enhanced RKKY couplings between the impurity moments.
2016
Role of magnetic dopants in the phase diagram of Sm 1111 pnictides: The case of Mn / Lamura, G.; Shiroka, T.; Bordignon, Sara; Sanna, S.; Moroni, M.; DE RENZI, Roberto; Carretta, P.; Biswas, P. K.; Caglieris, F.; Putti, M.; Wurmehl, S.; Singh, S. J.; Shimoyama, J.; Gastiasoro, M. N.; Andersen, B. M.. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 94:21(2016), pp. 214517-1-214517-9. [10.1103/PhysRevB.94.214517]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2820266
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