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Jesche, Anton; Förster, Tobias; Spehling, J.; Souza, M. de; Gumeniuk, Roman; Luetkens, H.; Goltz, Til; Krellner, C.; Lang, Murong; Sichelschmidt, J.; Klauß, H.‐H.; Geibel, C.

doi:10.1103/physrevb.86.019903

Cited by 23 publications

(35 citation statements)

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“…Different from CeFe 1−x Co x AsO and GdFe 1−y Co y AsO, superconductivity was only observed around x = 0.3 in CeFeAs 1−x P x O, which seems to coexist with ferromagnetism of Ce below 4 K. 25 The magnetic order of Ce persists up to x = 0.9 in CeFeAs 1−x P x O, but it changes from an AFM-to a FMtype order while the SDW transition of Fe is suppressed around x ≃ 0.3. [23][24][25] In contrast, the AFM order of Ceions is remarkably robust against Fe/Co substitution. Its ordering temperature T Ce N increases with x while suppressing the SDW transition of Fe, followed by a nearly unchanged value.…”

Section: E Phase Diagram and Discussionmentioning

confidence: 87%

“…22 Recent studies demonstrated that a ferromagnetic (FM) state of Ce 4f electrons, separating the AFM state from the PM heavy fermion state, develops in the intermediate doping region in CeFeAs 1−x P x O. [23][24][25] Moreover, the Co-end compounds, namely ReCoP nO, demonstrate rich magnetic properties attributed to the interactions between the 3d and 4f electrons. For example, CeCoAsO and CeCoPO exhibit an enhanced Sommerfeld coefficient of 200 mJ/mol-K 2 , and their Co-ions undergo a FM transition at T Co C = 75 K. 26,27 LaCoAsO and LaCoPO are itinerant ferromagnets with a Curie temperature of T Co C = 50 K and 60 K, respectively.…”

Section: K)mentioning

confidence: 99%

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Tunable interplay between3dand4felectrons in Co-doped iron pnictides

et al. 2013

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We study the interplay of 3d and 4f electrons in the iron pnictides CeFe1−xCoxAsO and GdFe1−yCoyAsO, which correspond to two very different cases of 4f -magnetic moment. Both CeFeAsO and GdFeAsO undergo a spin-density-wave (SDW) transition associated with Fe 3d electrons at high temperatures, which is rapidly suppressed by Fe/Co substitution. Superconductivity appears in a narrow doping range: 0.05 < x < 0.2 for CeFe1−xCoxAsO and 0.05 < y < 0.25 for GdFe1−yCoyAsO, showing a maximum transition temperature Tsc of about 13.5 K for Ce and 19 K for Gd. In both compounds, the 4f -electrons form an antiferromagnetic (AFM) order at low temperatures over the entire doping range and Co 3d electrons are ferromagnetically ordered on the Co-rich side; the Curie temperature reaches T Co C ≈ 75 K at x = 1 and y = 1. In the Ce-compounds, the Néel temperature T Ce N increases upon suppressing the SDW transition of Fe and then remains nearly unchanged with further increasing Co concentration up to x ≃ 0.8 (T Ce N ≈ 4 K). Furthermore, evidence of Co-induced polarization on Ce-moments is observed on the Co-rich side. In the Gd-compounds, the two magnetic species of Gd and Co are coupled antiferromagnetically to give rise to ferrimagnetic behavior in the magnetic susceptibility on the Co-rich side. For 0.7 ≤ y < 1.0, the system undergoes a possible magnetic reorientation below the Néel temperature of Gd (T Gd N ). Our results suggest that the effects of both electron hybridizations and magnetic exchange coupling between the 3d-4f electrons give rise to a rich phase diagram in the rare-earth iron pnictides. PACS number(s): 74.70. Xa,71.20.Eh,75.20.Hr

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Section: E Phase Diagram and Discussionmentioning

confidence: 87%

Section: K)mentioning

confidence: 99%

Tunable interplay between3dand4felectrons in Co-doped iron pnictides

et al. 2013

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“…Examples include some heavy fermion superconductors [24][25][26][27][28][29][30][31][32] , Ruthenatelayered cuprates [33][34][35][36][37][38] , Eu(Fe 1−y Co y ) 2 (As 1−x P x ) 2 39-44 , and CeFe(As 1−y P y )(O 1−x F x ) [45][46][47][48] . Layered superconductors are typically composed of alternating superconducting and blocking layers 1,2,49,50 .…”

Section: 267mentioning

confidence: 99%

Coexistence of ferromagnetism and superconductivity inCeO0.3F0.7BiS2

et al. 2014

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Bulk magnetization, transport and neutron scattering measurements were performed to investigate the electronic and magnetic properties of a polycrystalline sample of the newly discovered ferromagnetic superconductor, CeO0.3F0.7BiS2. Ferromagnetism develops below TF M = 6.54(8) K and superconductivity is found to coexist with the ferromagnetic state below TSC ∼ 4.5 K. Inelastic neutron scattering measurements reveal a very weakly dispersive magnetic excitation at 1.8 meV that can be explained by an Ising-like spin Hamiltonian. Under application of an external magnetic field, the direction of the magnetic moment changes from the c-axis to the ab-plane and the 1.8 meV excitation splits into two modes. A possible mechanism for the unusual magnetism and its relation to superconductivity is discussed.

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“…1 Evidence for a magnetic quantum phase transition was shown in CeFeAs 1−x P x O, where the AFM state is separated from the PM heavy fermion state, and a ferromagnetic order develops in the intermediate doping region. [11][12][13] These indicate that the 1111-type iron pnictides may provide a representative system to study the interplay of 4f and 3d electrons, and their emergent properties. A systematic study of the interplay between 4f and 3d electrons would help elucidate the nature of superconductivity and magnetism in iron pnictides.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 Elemental substitutions in CeFeAsO, e.g., Fe/Co or As/P, may induce superconductivity while suppressing the magnetic order of Fe-3d electrons. [11][12][13][14][15] On the other hand, CeFePO is a paramagnetic (PM) heavy fermion metal. 1 Evidence for a magnetic quantum phase transition was shown in CeFeAs 1−x P x O, where the AFM state is separated from the PM heavy fermion state, and a ferromagnetic order develops in the intermediate doping region.…”

Section: Introductionmentioning

confidence: 99%