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Stock, Chris; Cowley, R. A.; Buyers, W. J. L.; Frost, Christopher; Taylor, J. W.; Peets, Darren C.; Liang, Ruixing; Bonn, D. A.; Hardy, W. N.

doi:10.1103/physrevb.82.174505

Cited by 48 publications

(68 citation statements)

References 102 publications

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“…[31,32] The results for CeCoIn 5 differ from excitations observed in dimer quantum magnets (namely TlCuCl 3 and PHCC) where the ground state is a singlet and the first excited state is a triplet. [33,34] The ∆S z =±1 modes have equal intensity and the ∆S z =0 mode (the central peak) is strongest.…”

Section: Though Other Theories Have Been Proposed (Ref 30)mentioning

confidence: 39%

Magnetic Field Splitting of the Spin Resonance inCeCoIn5

et al. 2012

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Neutron scattering in strong magnetic fields is used to show the spin-resonance in superconducting CeCoIn5 (Tc=2.3 K) is a doublet. The underdamped resonance (hΓ=0.069 ± 0.019 meV) Zeeman splits into two modes at E±=hΩ0 ±gµBµ0H with g=0.96 ± 0.05. A linear extrapolation of the lower peak reaches zero energy at 11.2 ± 0.5 T, near the critical field for the incommensurate "Q-phase" (Ref. 1) indicating that the Q-phase is a bose condensate of spin excitons.PACS numbers: 75.40. Gb, 74.70.Tx, 75.50.Cc The presence of an underdamped resonance peak in the neutron scattering response has proven to be a strong indication of unconventional superconductivity where magnetism and electronic properties are strongly coupled. [2,3] Spin resonances have been reported in a series of heavy fermion, cuprate and iron based superconductors and have been associated with the gap function undergoing a change in sign (∆(q + Q 0 ) = −∆(q)). Therefore, neutron scattering can be used to probe the electronic superconducting gap symmetry.It is to be expected that applied magnetic fields, which suppress the superconducting order parameter, should have a strong effect on the spin resonance. Such effects have been difficult to pursue in the cuprates and iron based superconductors where chemical doping is required and resonance energies are high.[4] CeCoIn 5 is, however, particularly well suited owing to the stoichiometric nature of the compound and the accessible field and energy scales.CeCoIn 5 displays an unconventional superconducting phase at ambient pressures and at temperatures below 2.3 K with a gap characterized by d-wave symmetry. [5][6][7][8] The structure is layered tetragonal with magnetic Ce 3+ ions in Ce-In(1) planes stacked along the c-axis and separated by a Co-In(2) network.[9] Despite the two-dimensional magnetic network, the Fermi surface is characterized by three dimensional sheets. [10-12] However, the superconductivity does reflect the underlying lamellar structure with a critical field of ∼12 T for fields applied with the a − b plane and significantly lower ∼5 T for fields applied along c at temperatures below 0.1 K. [13][14][15][16] Neutron scattering [Ref. 17] shows the normal state has overdamped magnetic excitations peaked near Q 0 =(1/2,1/2,1/2) indicative of antiferromagnetic interactions between Ce 3+ ions both within the a − b plane and along c. The commensurate magnetic spin response differs from non-superconducting, though metallic, CeRhIn 5 which displays a magnetic Bragg peak at the incommensurate point Q=(1/2,1/2,0.297) with a spiral magnetic structure.[18] On entering the superconducting phase in CeCoIn 5 , an underdamped resonance peak at hΩ 0 =0.60 meV develops gathering spectral weight from low-energies. These results indicated a strong coupling between f-electron d-wave superconductivity and magnetism. A similar result and analysis has been applied to the heavy fermion superconductor CeCu 2 Si 2 where a spin resonance has also been observed in the superconducting phase. [19] While no magnetic Bragg p...

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Section: Though Other Theories Have Been Proposed (Ref 30)mentioning

confidence: 39%

Magnetic Field Splitting of the Spin Resonance inCeCoIn5

et al. 2012

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“…The local moments in the Nd-and Pr-doped samples disappear in the cT phase , indicating that the Fe 2+ ions go through a spin-state transition by taking on the low-spin state in the cT phase. Inelastic neutron scattering experiments on CaFe 2 As 2 also reveal vanishing spin excitations in the cT phase (Soh et al, 2013), Large symbols: estimates of doping-dependent energy scale at which magnetic spectral weight falls below half that of the AF state based on inelastic neutron scattering studies of various cuprates (Stock et al, 2010a). Small gray symbols: pseudogap energy from various electronic spectroscopies .…”

Section: G Electronic Nematic Phase and Neutron Scattering Experimenmentioning

confidence: 99%

Antiferromagnetic order and spin dynamics in iron-based superconductors

2015

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High-transition temperature (high-Tc) superconductivity in the iron pnictides/chalcogenides emerges from the suppression of the static antiferromagnetic order in their parent compounds, similar to copper oxides superconductors. This raises a fundamental question concerning the role of magnetism in the superconductivity of these materials. Neutron scattering, a powerful probe to study the magnetic order and spin dynamics, plays an essential role in determining the relationship between magnetism and superconductivity in high-Tc superconductors. The rapid development of modern neutron time-of-flight spectrometers allows a direct determination of the spin dynamical properties of iron-based superconductors throughout the entire Brillouin zone. In this review, we present an overview of the neutron scattering results on iron-based superconductors, focusing on the evolution of spin excitation spectra as a function of electron/hole-doping and isoelectronic substitution. We compare spin dynamical properties of iron-based superconductors with those of copper oxide and heavy fermion superconductors, and discuss the common features of spin excitations in these three families of unconventional superconductors and their relationship with superconductivity.

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“…44 shows the loss of low-energy spectral weight in highly overdoped LSCO compared to LBCO with x = 1/8. Stock and workers [78] were the first to address this trend. Looking over all available data, they attempted to identify, for each sample, the energy at which the magnetic spectral weight falls to half of that for the antiferromagnet.…”

Section: Magnetic Spectral Weightmentioning

confidence: 99%

“…3 FIGURE 45. Energy scale at which magnetic spectral weight falls below half that of the antiferromagnetic parent, evaluated from neutron scattering results on a number of cuprate superconductors by Stock et al [78]. The dots are from [86].…”

Section: -Magnon Raman Scatteringmentioning

confidence: 99%

Spins, stripes, and superconductivity in hole-doped cuprates

Tranquada¹

2013

AIP Conference Proceedings

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Abstract. One of the major themes in correlated electron physics over the last quarter century has been the problem of high-temperature superconductivity in hole-doped copper-oxide compounds. Fundamental to this problem is the competition between antiferromagnetic spin correlations, a symptom of strong Coulomb interactions, and the kinetic energy of the doped carriers, which favors delocalization. After discussing some of the early challenges in the field, I describe the experimental picture provided by a variety of spectroscopic and transport techniques. Then I turn to the technique of neutron scattering, and discuss how it is used to determine spin correlations, especially in model systems of quantum magnetism. Neutron scattering and complementary techniques have determined the extent to which antiferromagnetic spin correlations survive in the cuprate superconductors. One experimental case involves the ordering of spin and charge stripes. I first consider related measurements on model compounds, such as La 2−x Sr x NiO 4+δ , and then discuss the case of La 2−x Ba x CuO 4 . In the latter system, recent transport studies have demonstrated that quasi-two-dimensional superconductivity coexists with the stripe order, but with frustrated phase order between the layers. This has led to new concepts for the coexistence of spin order and superconductivity. While the relevance of stripe correlations to high-temperature superconductivity remains a subject of controversy, there is no question that stripes are an intriguing example of electron matter that results from strong correlations.Keywords: superconductivity, antiferromagnetism, charge order, stripes, cuprates, nickelates, neutron scattering PACS: 78.70.Nx OPENING REMARKSCuprate superconductivity is a fascinating field, with an enormous literature. There have been a great many measurements done on a wide variety of cuprate families. There are numerous theoretical perspectives on the nature of these materials and on the mechanism of superconductivity.I approach this topic not as an unbiased outside observer, but as a participant who has been around from the beginning. My purpose here is not to present a balanced review of all work and perspectives in the field, as there would be too much to cover. Instead, I will present one story about hole-doped cuprates, based largely on experiment and especially on neutron scattering studies. Since one of the main advantages of neutrons is their ability to follow dynamic antiferromagnetic spin correlations, it should come as no surprise that they will play a key role in the story.I have tried to cite sufficient references (especially review articles) so that the curious reader can find further information and potentially a starting point in searching the broader literature. I have not attempted to cite all relevant work, as that would have been

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Effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconductingYBa2Cu3O6.5

Cited by 48 publications

References 102 publications

Magnetic Field Splitting of the Spin Resonance inCeCoIn5

Magnetic Field Splitting of the Spin Resonance inCeCoIn5

Antiferromagnetic order and spin dynamics in iron-based superconductors

Spins, stripes, and superconductivity in hole-doped cuprates

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