Long- to short-range magnetic order in fluorine-doped CeFeAsO

Shiroka, T.; Lamura, G.; Sanna, Samuele; Prando, Giacomo; Renzi, R. De; Tropeano, M.; Cimberle, M. R.; Martinelli, A.; Bernini, C.; Palenzona, A.; Fittipaldi, R.; Vecchione, A.; Carretta, P.; Siri, A. S.; Putti, M.

doi:10.1103/physrevb.84.195123

Cited by 36 publications

(81 citation statements)

References 40 publications

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“…A similar asymmetry behavior has been observed also in other systems, including spin chains with bond-and site disorder, 32,33 or in iron-based superconductors at intermediate F doping. 34 In all these cases, the high sensitivity of µSR to chemical modifications emphasizes the delicate nature of the (originally) homogeneous magnetic order which, nevertheless, does not evolve to a different type of magnetic structure. In fact, also our high-pressure µSR measurements on Na 2 IrO 3 reveal that the nature of the magnetic ground state remains virtually the same, although the magnetic ordering temperature increases significantly with pressure, at a rate of 1.6 K/GPa.…”

Section: Discussionmentioning

confidence: 99%

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

et al. 2018

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The low-temperature magnetic properties of polycrystalline Na 2 IrO 3 , a candidate material for the realization of a quantum spin-liquid state, were investigated by means of muon-spin relaxation and nuclear magnetic resonance methods under chemical and hydrostatic pressure. The Li-for-Na chemical substitution promotes an inhomogeneous magnetic order, whereas hydrostatic pressure (up to 3.9 GPa) results in an enhancement of the ordering temperature T N . In the first case, the inhomogeneous magnetic order suggests either short-or long-range correlations of broadly distributed j = ½ Ir 4+ magnetic moments, reflecting local disorder. The increase of T N under applied pressure points at an increased strength of three dimensional interactions arising from interlayer compression.

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Section: Discussionmentioning

confidence: 99%

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

et al. 2018

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“…Accordingly, one has V m ≃ 100 % and it must be assumed that the interstitial regions between the different magnetic domains are superconducting since dc magnetometry confirms that a bulk fraction of the sample contributes to the diamagnetic shielding. Such fine intertwining of different order parameters was detected in SmFeAsO 1−x F x [99,100,101], in CeFeAsO 1−x F x [94,53], in CeFe 1−x Co x AsO [55].…”

Section: Electronic Phase Diagram and The Coexistence Between Magnetimentioning

confidence: 94%

“…In these cases, one useful way to distinguish among the two scenarios is to perform a longitudinal-field (LF) scan. Only in the case of a static distribution of local fields the application of a strong enough magnetic field allows one to quench the spin-depolarization and to estimate the width of the static distribution (see [53] for example).…”

Section: And the Whole Second Term In Eq 2 Vanishes Leading Tomentioning

confidence: 99%

A view from inside iron-based superconductors

Carretta¹,

Renzi²,

Prando³

et al. 2013

Phys. Scr.

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Abstract. Muon spin spectroscopy is one of the most powerful tools to investigate the microscopic properties of superconductors. In this manuscript, an overview on some of the main achievements obtained by this technique in the iron-based superconductors (IBS) are presented. It is shown how the muons allow to probe the whole phase diagram of IBS, from the magnetic to the superconducting phase, and their sensitivity to unravel the modifications of the magnetic and the superconducting order parameters, as the phase diagram is spanned either by charge doping, by an external pressure or by introducing magnetic and non-magnetic impurities. Moreover, it is highlighted that the muons are unique probes for the study of the nanoscopic coexistence between magnetism and superconductivity taking place at the crossover between the two ground-states.

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“…Considering this and the rather similar oscillating fractions α in a powder and in a mosaic sample, one can attempt an evaluation of the magnetic fraction V M as a function of doping and temperature by means of V M (T ) = 3 /2 (1 − a L ) × 100%. 42 The resulting V M (T ) values for the pristine and Ca-substituted EuFe 2 As 2 samples are shown in Fig. 13.…”

Section: F Muon-spin Relaxationmentioning

confidence: 99%

Magnetic phase diagram of Ca-substituted EuFe2As2

et al. 2018

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The simultaneous presence of a Fe-related spin-density wave and antiferromagnetic order of Eu 2+ moments ranks EuFe 2 As 2 among the most interesting parent compounds of iron-based pnictide superconductors. Here we explore the consequences of the dilution of Eu 2+ magnetic lattice through on-site Ca substitution. By employing macro-and microscopic techniques, including electrical transport and magnetometry, as well as muon-spin spectroscopy, we study the evolution of Eu magnetic order in both the weak and strong dilution regimes, achieved for Ca concentration x(Ca) = 0.12 and 0.43, respectively. We demonstrate the localized character of the Eu antiferromagnetism mediated via RKKY interactions, in contrast with the largely itinerant nature of Fe magnetic interactions. Our results suggest a weak coupling between the Fe and Eu magnetic sublattices and a rapid decrease of the Eu magnetic interaction strength upon Ca substitution. The latter is confirmed both by the depression of the ordering temperature of the Eu 2+ moments, T N , and the decrease of magnetic volume fraction with increasing x(Ca). We establish that, similarly to the EuFe 2 As 2 parent compound, the investigated Ca-doped compounds have a twinned structure and undergo a permanent detwinning upon applying an external magnetic field. arXiv:1805.03896v2 [cond-mat.mtrl-sci]

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Long- to short-range magnetic order in fluorine-doped CeFeAsO

Cited by 36 publications

References 40 publications

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

Chemical and hydrostatic-pressure effects on the Kitaev honeycomb material Na2IrO3

A view from inside iron-based superconductors

Magnetic phase diagram of Ca-substituted EuFe2As2

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