From quantum matter to high-temperature superconductivity in copper oxides

Keimer, B.; Kivelson, Steven A.; Norman, M. R.; Uchida, S.; Zaanen, Jan

doi:10.1038/nature14165

Cited by 2,166 publications

(2,123 citation statements)

References 155 publications

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“…A standard four-probe configuration, using spot-welded contacts, was used to measure the c axis electrical resistivity with an LR700 Resistance Bridge. Two different cryostats were used to control temperature and magnetic field: a 4 He cryostat for temperature measurements from 300 to 1.2 K and a 3 He cryostat for temperatures from 10 down to 0.3 K and for magnetic fields up to 5 Tesla. …”

Section: Methodsmentioning

confidence: 99%

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Controlling superconductivity by tunable quantum critical points

et al. 2015

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The heavy fermion compound CeRhIn 5 is a rare example where a quantum critical point, hidden by a dome of superconductivity, has been explicitly revealed and found to have a local nature. The lack of additional examples of local types of quantum critical points associated with superconductivity, however, has made it difficult to unravel the role of quantum fluctuations in forming Cooper pairs. Here, we show the precise control of superconductivity by tunable quantum critical points in CeRhIn 5 . Slight tin-substitution for indium in CeRhIn 5 shifts its antiferromagnetic quantum critical point from 2.3 GPa to 1.3 GPa and induces a residual impurity scattering 300 times larger than that of pure CeRhIn 5 , which should be sufficient to preclude superconductivity. Nevertheless, superconductivity occurs at the quantum critical point of the tin-doped metal. These results underline that fluctuations from the antiferromagnetic quantum criticality promote unconventional superconductivity in CeRhIn 5 .

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Section: Methodsmentioning

confidence: 99%

“…Unconventional superconductivity is a potential ordered quantum state that subsumes entropy generated by the proliferation of fluctuations emanating from the quantum critical point (QCP) [3][4][5] . In this case, the spectrum of associated quantum fluctuations determines the structure of the superconducting (SC) gap [6][7][8][9] .…”

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confidence: 99%

Controlling superconductivity by tunable quantum critical points

et al. 2015

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“…In solids, superconductivity arising from Cooper pairing with long-range phase coherence is the archetype of quantum condensation. Indeed, the insights and advances in quantum matter arising from the study of superconductivity are unparalleled 14 . The notion of condensation extends beyond the domain of superconductivity to other bosonic excitations, including magnons, excitons and exciton-polaritons [70][71][72] .…”

Section: Creating Macroscopic Quantum Coherencementioning

confidence: 99%

“…For example, experiments in high magnetic fields H offer innate advantages for addressing and settling some of the most pressing questions in high-T c superconductivity: a problem that has eluded a thorough theoretical explanation 14 . Unresolved issues include the nature of the electronic state at T > T c from which superconductivity emerges, the character of the ground state as T→0 in the absence of superconductivity, and the origin of the quantum critical point (QCP): a zero-temperature phase transition where pressure or doping serve as tuning parameters (Fig.…”

Section: Why Properties On Demand?mentioning

confidence: 99%

Towards properties on demand in quantum materials

2017

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Q uantum materials are on the ascent. This term embodies a vast portfolio of compounds and phenomena where ramifications of quantum mechanics are demonstrably real. Quantum materials are in the vanguard of contemporary physics in part because these systems afford an exceptional venue to uncover the many roles of symmetry, topology, dimensionality and strong correlations in macroscopic observables. Here we set out to explore the ways and means of creating new states of matter in quantum materials and manipulating their phases via external stimuli. Practical control of these properties is a precondition for exploiting quantum advantages in new photonic, electronic and energy technologies, a task of significant societal impact 1 . We will primarily focus on the following classes of quantum materials: transition metal oxides, Fe-and Cu-based high-T c superconductors, van der Waals semiconductors, topological insulators and Weyl semimetals, and, finally, graphene.The properties of quantum materials are anomalously sensitive to external stimuli. In these systems, interactions associated with spin, charge, lattice and orbital degrees of freedom are commonly on par with the electronic kinetic energy. A rather fragile balance between coexisting and competing ground states can be readily shifted via external stimuli, leading to a raft of quantum phases and transitions between them 2,3 . Furthermore, certain classes of driven quantum states (Fig. 1a and Box 1) are explicit products of coherent interaction between light and matter 4-6 . Alternatively, the properties of quantum materials can be pre-programmed by directly manipulating the electronic wavefunction and the attendant Berry phase that give rise to the anomalous velocity of electrons in a solid [7][8][9] . These complementary avenues of controls mean that investigations no longer need to be reduced to merely observing (in contrast, for example, to astrophysics). Instead, it is now feasible to attain, in a predictable fashion, 'properties on demand' by steering a quantum material towards a desirable ground, metastable or transient state. The past decade has witnessed an explosion in the field of quantum materials, headlined by the predictions and discoveries of novel Landau-symmetry-broken phases in correlated electron systems, topological phases in systems with strong spin-orbit coupling, and ultra-manipulable materials platforms based on two-dimensional van der Waals crystals. Discovering pathways to experimentally realize quantum phases of matter and exert control over their properties is a central goal of modern condensed-matter physics, which holds promise for a new generation of electronic/photonic devices with currently inaccessible and likely unimaginable functionalities. In this Review, we describe emerging strategies for selectively perturbing microscopic interaction parameters, which can be used to transform materials into a desired quantum state. Particular emphasis will be placed on recent successes to tailor electronic interaction parameters through th...

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“…1,2) A striking feature in these materials is that, in several cases, physical properties that deviate from the conventional Fermi-liquid theory (i.e., non-Fermi liquid properties) also appear when the AFM transition is tuned to zero temperature (T ), suggesting the existence of an AFM quantum critical point (QCP). Although it is widely believed that quantum-critical fluctuations originating from the QCP are closely related to the superconductivity through unconventional pairing mechanisms, 3,4) it remains unclear whether the QCP actually exists inside the superconducting dome.…”

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confidence: 99%

Impact of Disorder on the Superconducting Phase Diagram in BaFe₂(As₁₋_xP_x)₂

et al. 2017

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In many classes of unconventional superconductors, the question of whether the superconductivity is enhanced by the quantum-critical fluctuations on the verge of an ordered phase remains elusive. One of the most direct ways of addressing this issue is to investigate how the superconducting dome traces a shift of the ordered phase. Here, we study how the phase diagram of the iron-based superconductor BaFe 2 (As 1−x P x ) 2 changes with disorder via electron irradiation, which keeps the carrier concentrations intact. With increasing disorder, we find that the magneto-structural transition is suppressed, indicating that the critical concentration is shifted to the lower side. Although the superconducting transition temperature T c is depressed at high concentrations (x 0.28), it shows an initial increase at lower x. This implies that the superconducting dome tracks the shift of the antiferromagnetic phase, supporting the view of the crucial role played by quantum-critical fluctuations in enhancing superconductivity in this iron-based high-T c family.In strongly correlated electron systems such as heavy fermions, cuprates, and organic materials, superconductivity often emerges when the antiferromagnetic (AFM) order is suppressed through control parameters such as pressure and chemical composition. 1,2) A striking feature in these materials is that, in several cases, physical properties that deviate from the conventional Fermi-liquid theory (i.e., non-Fermi liquid properties) also appear when the AFM transition is tuned to zero temperature (T ), suggesting the existence of an AFM quantum critical point (QCP). Although it is widely believed that quantum-critical fluctuations originating from the QCP are closely related to the superconductivity through unconventional pairing mechanisms, 3,4) it remains unclear whether the QCP actually exists inside the superconducting dome. The recently discovered iron pnictides 5) also exhibit superconductivity in the vicinity of AFM order accompanying tetragonal-to-orthorhombic structural transitions. 6) These magneto-structural transitions can be suppressed by pressure or chemical substitution, 7) but the quantum criticality is often avoided by a first-order transition in several systems. 6) Among the iron pnictides, Phosphorus(P)-substituted BaFe 2 As 2 is a particularly clean system, and moreover, is unique in the fact that there is growing evidence for the existence of a QCP inside the superconducting dome near the optimal composition. 8-13) Although a QCP located at the maximum T c naturally leads to the consideration that the quantum-critical fluctuations help to enhance superconductivity, there has been no direct evidence against a scenario that it is just a coincidence. A direct test to address this issue is to investigate how the superconducting dome traces when the AFM phase is shifted. However, it has been quite challenging to perform such experiments without changing the carrier numbers or bandwidth, whose effects on the QCP and superconductivity are nontrivial. In fact, ...

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From quantum matter to high-temperature superconductivity in copper oxides

Cited by 2,166 publications

References 155 publications

Controlling superconductivity by tunable quantum critical points

Controlling superconductivity by tunable quantum critical points

Towards properties on demand in quantum materials

Impact of Disorder on the Superconducting Phase Diagram in BaFe₂(As₁₋_xP_x)₂

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From quantum matter to high-temperature superconductivity in copper oxides

Cited by 2,166 publications

References 155 publications

Controlling superconductivity by tunable quantum critical points

Controlling superconductivity by tunable quantum critical points

Towards properties on demand in quantum materials

Impact of Disorder on the Superconducting Phase Diagram in BaFe2(As1−xPx)2

Contact Info

Product

Resources

About

Impact of Disorder on the Superconducting Phase Diagram in BaFe₂(As₁₋_xP_x)₂