Field-induced magnetic transitions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Ca</mml:mi><mml:mn>10</mml:mn></mml:msub><mml:mo>(</mml:mo><mml:msub><mml:mi>Pt</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>8</mml:mn></mml:msub><mml:mo>)</mml:mo><mml:mo>(</mml:mo><mml:mo>(</mml:mo><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Pt</mml:mi><mml:mi>x</mml:mi></mml:ms

Watson, M. D.; McCollam, A.; Blake, S. F.; Vignolles, David; Drigo, L.; Mazin, I. I.; Guterding, Daniel; Jeschke, Harald O.; Valentí, Roser; Ni, N.; Cava, R. J.; Coldea, A. I.

doi:10.1103/physrevb.89.205136

Cited by 19 publications

(18 citation statements)

References 43 publications

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“…There are additional indications that the anisotropy of the superconducting gap increases toward the edges of the superconducting dome as compared to the optimal doping [10]. While direct measurements of the superconducting order parameter remain scarce, it has already been suggested that iron-platinum arsenides could share the same pairing mechanism with other iron-based superconductors, mediated by the AFM spin fluctuations [5,29]. A verification of this hypothesis would require the knowledge of the spin-fluctuation spectrum and the order-parameter symmetry in these new compounds, which we address in the present work.…”

Section: Introductionmentioning

confidence: 97%

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic(CaFe1−xPtxAs)10Pt3

et al. 2015

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Using a combination of muon-spin relaxation (μSR), inelastic neutron scattering (INS), and nuclear magnetic resonance (NMR), we investigated the novel iron-based superconductor with a triclinic crystal structure (CaFe 1−x Pt x As) 10 Pt 3 As 8 (T c = 13 K), containing platinum-arsenide intermediary layers. The temperature dependence of the superfluid density obtained from the μSR relaxation-rate measurements indicates the presence of two superconducting gaps, 1 2 . According to our INS measurements, commensurate spin fluctuations are centered at the (π, 0) wave vector, like in most other iron arsenides. Their intensity remains unchanged across T c , indicating the absence of a spin resonance typical for many Fe-based superconductors. Instead, we observed a peak in the spin-excitation spectrum around ω 0 = 7 meV at the same wave vector, which persists above T c and is characterized by the ratio ω 0 /k B T c ≈ 6.2, which is significantly higher than typical values for the magnetic resonant modes in iron pnictides (∼ 4.3). The temperature dependence of magnetic intensity at 7 meV revealed an anomaly around T * = 45 K related to the disappearance of this new mode. A suppression of the spin-lattice relaxation rate, 1/T 1 T , observed by NMR immediately below T * without any notable subsequent anomaly at T c , indicates that T * could mark the onset of a pseudogap in (CaFe 1−x Pt x As) 10 Pt 3 As 8 , which is likely associated with the emergence of preformed Cooper pairs.

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Section: Introductionmentioning

confidence: 97%

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic(CaFe1−xPtxAs)10Pt3

et al. 2015

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“…(2) Since torque τ is the angular derivative of free energy F, we get [35][36][37][38] Here, we have…”

Section: -36mentioning

confidence: 99%

Spin-flop transition and magnetic phase diagram inCaCo2As2revealed by torque measurements

Zhang¹,

Nadeem²,

Xiao³

et al. 2015

Phys. Rev. B

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The magnetic properties of CaCo2As2 single crystal was systematically studied by using dc magnetization and magnetic torque measurements. A paramagnetic to antiferromagnetic transition occurs at TN = 74 K with Co spins being aligned parallel to the c axis. For H c, a field-induced spin-flop transition was observed below TN and a magnetic transition from antiferromagnetic to paramagnetic was inferred from the detailed analysis of magnetization and magnetic torque. Finally, we summarize the magnetic phase diagram of CaCo2As2 based on our results in the H-T plane.

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“…77, we estimate the value of the spin flop field B SF as B SF = 2√KΔ/M, where K is the magnetocrystalline anisotropy energy, Δ=2.4 meV/f.u. is the energy difference between ferromagnetic and zigzag antiferromagnetic states, and M is the Ni magnetic moment.…”

Section: F Density Functional Theory Determination Of Exchange Intermentioning

confidence: 99%

Zigzag antiferromagnetic quantum ground state in monoclinic honeycomb lattice antimonatesA3Ni2SbO6(A=<

et al. 2015

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We present a comprehensive experimental and theoretical study of the electronic and magnetic properties of two quasi-two-dimensional (2D) honeycomb-lattice monoclinic compounds A 3 Ni 2 SbO 6 (A=Li, Na). Magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic (AFM) long range order at low temperatures with Néel temperatures ~ 14 and 16 K for Li 3 Ni 2 SbO 6 and Na 3 Ni 2 SbO 6 , respectively. The effective magnetic moments of 4.3  B /f.u. (Li 3 Ni 2 SbO 6 ) and 4.4  B /f.u. (Na 3 Ni 2 SbO 6 ) indicate that Ni 2+ is in a high-spin configuration (S=1). The temperature dependence of the inverse magnetic susceptibility follows the Curie-Weiss law in the high-temperature region and shows positive values of the Weiss temperature ~ 8 K (Li 3 Ni 2 SbO 6 ) and ~12 K (Na 3 Ni 2 SbO 6 ) pointing to the presence of nonnegligible ferromagnetic interactions, although the system orders AFM at low temperatures. In addition, the magnetization curves reveal a field-induced (spin-flop type) transition below T N that can be related to the magnetocrystalline anisotropy in these systems. These observations are in agreement with density functional theory calculations, which show that both antiferromagnetic and ferromagnetic intralayer spin exchange couplings between Ni 2+ ions are present in the honeycomb planes supporting a zigzag antiferromagnetic ground state. Based on our experimental measurements and theoretical calculations we propose magnetic phase diagrams for the two compounds. 75.30.Kz; 75.10.Dg; 75.30.Gw; 75.30.Et

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Field-induced magnetic transitions inCa10(Pt3As8)((Fe1−xPtx

Cited by 19 publications

References 43 publications

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic(CaFe1−xPtxAs)10Pt3

Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic(CaFe1−xPtxAs)10Pt3

Spin-flop transition and magnetic phase diagram inCaCo2As2revealed by torque measurements

Zigzag antiferromagnetic quantum ground state in monoclinic honeycomb lattice antimonatesA3Ni2SbO6(A=<

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