Mott-Driven BEC-BCS Crossover in a Doped Spin Liquid Candidate 
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Suzuki, Y.; Wakamatsu, Kodai; Ibuka, Jun; Ôike, Hiroshi; Fujii, Toshitsugu; Miyagawa, Kazuya; Taniguchi, Hiromi; Kanoda, K.

doi:10.1103/physrevx.12.011016

Cited by 21 publications

(20 citation statements)

References 56 publications

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“…The possible occurrence of the peak of the speed of sound has also been discussed in the density-induced BEC-BCS crossover with the finite-range interaction [25]. We note that the carrier-density-induced BEC-BCS crossover has been realized in strongly correlated electron systems recently [26][27][28][29].…”

Section: Introductionmentioning

confidence: 72%

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

et al. 2023

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We discuss the hadron–quark crossover accompanied by the formation of Cooper triples (three-body counterpart of Cooper pairs) by analogy with the Bose–Einstein condensate to Bardeen–Cooper–Schrieffer crossover in two-component fermionic systems. Such a crossover is different from a phase transition, which often involves symmetry breaking. We calculate the in-medium three-body energy from the three-body T-matrix with a phenomenological three-body force characterizing a bound hadronic state in vacuum. With increasing density, the hadronic bound-state pole smoothly undergoes a crossover toward the Cooper triple phase where the in-medium three-body clusters coexist with the quark Fermi sea. The relation to the quarkyonic matter model can also be found in a natural manner.

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Section: Introductionmentioning

confidence: 72%

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

et al. 2023

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“…This limit also known as BCS limit. Detailed studies of the transition of one material from BEC into BCS under high pressure can be found elsewhere [36].…”

Section: Fermi Temperature Tfmentioning

confidence: 99%

Electron–phonon coupling constant and BCS ratios in LaH_10−y doped with magnetic rare-earth element

Talantsev¹

2022

Supercond. Sci. Technol.

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Stoichiometric near-room temperature superconductors (NRTS) (for instance, H3S and LaH10) exhibit a high ground state upper critical field, B c2(0) > 100 T, such that the magnetic phase diagram in these materials cannot be measured in non-destructive experiments. However, Semenok et al. (2022 arXiv2203.06500) proposed the idea of exploring the full magnetic phase diagram in NRTS samples, in which superconducting order parameter is suppressed by magnetic element doping. If the element is uniformly distributed in the material, then the theory of electron-phonon mediated superconductivity predicts the suppression of the order parameter in a three-dimensional s-wave superconductor. Semenok et al. (arXiv2203.06500) experimentally proved this idea for LaH10 by substituting lanthanum with the magnetic rare earth neodymium. As a result, the transition temperature in La1-xNdxH10 (x = 0.09) was suppressed to T c ~ 120 K, and the upper critical field decreases to B c2(T=41 K) = 55 T. While the exact hydrogen content should be further established in the (La1-xNdx)H10-y (x = 0.09) (because similar T c suppression was observed in hydrogen deficient LaH10-y samples reported by Drozdov et al (2019 Nature 569 528)), a significant part of the full magnetic phase diagram for (La1-xNdx)H10-y (x = 0.09) sample was measured. Here we analyzed the reported (Semenok et al (2022 arXiv2203.06500)) magnetoresistance data for La1-xNdxH10 (x=0.09) compressed at P = 180 GPa and deduced: (a) Debye temperature, Tθ = 1156 ± 6 K, (b) the electron-phonon coupling constant, λe-ph = 1.65 ± 0.01; (c) the ground state superconducting energy gap, Δ(0) = 20.2 ± 1.3 meV; (d) the gap-to-transition temperature ratio, 2Δ(0)/kBTc = 4.0 ± 0.2; and (e) the relative jump in specific heat at transition temperature, ΔC/γT c = 1.68 ± 0.15. The deduced values indicate that La1-xNdxH10 (x = 0.09; P = 180 GPa) is a moderately strongly coupled s-wave superconductor.

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“…A plausible explanation is that the AM state originates from broadening of the SIT 10 , 19 , 20 . An existence of such a broadened critical ground state, a so-called quantum critical phase, has attracted much attention in heavy fermion compounds and organic magnets 23 , 24 . To verify this scenario, the QCP must be found inside the broadened critical state.…”

Section: Introductionmentioning

confidence: 99%

Broadened quantum critical ground state in a disordered superconducting thin film

Ienaga,

Tamoto,

Yoda

et al. 2024

Nat Commun

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A superconductor-insulator transition (SIT) in two dimensions is a prototypical quantum phase transition (QPT) with a clear quantum critical point (QCP) at zero temperature (T = 0). The SIT is induced by a field B and observed in disordered thin films. In some of weakly disordered or crystalline thin films, however, an anomalous metallic (AM) ground state emerges over a wide B range between the superconducting and insulating phases. It remains a fundamental open question how the QPT picture of the SIT is modified when the AM state appears. Here we present measurements of the Nernst effect N, which has great sensitivity to the fluctuations of the superconducting order parameter. From a thorough contour map of N in the B-T plane, we found a thermal-to-quantum crossover line of the superconducting fluctuations, a so-called ghost-temperature line associated with the QPT, as well as a ghost-field line associated with a thermal transition. The QCP is identified as a T = 0 intercept of the ghost-temperature line inside the AM state, which verifies that the AM state is a broadened critical state of the SIT.

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Mott-Driven BEC-BCS Crossover in a Doped Spin Liquid Candidate κ−(BEDT−TTF)4Hg2.89

Cited by 21 publications

References 56 publications

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

Electron–phonon coupling constant and BCS ratios in LaH_10−y doped with magnetic rare-earth element

Broadened quantum critical ground state in a disordered superconducting thin film

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Mott-Driven BEC-BCS Crossover in a Doped Spin Liquid Candidate κ−(BEDT−TTF)4Hg2.89

Cited by 21 publications

References 56 publications

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

Density-Induced Hadron–Quark Crossover via the Formation of Cooper Triples

Electron–phonon coupling constant and BCS ratios in LaH10−y doped with magnetic rare-earth element

Broadened quantum critical ground state in a disordered superconducting thin film

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Electron–phonon coupling constant and BCS ratios in LaH_10−y doped with magnetic rare-earth element