Microscopic investigation of electronic inhomogeneity induced by substitutions in a quantum critical metal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CeCoIn</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>

Sakai, Hironori; Ronning, F.; Zhu, Jian‐Xin; Wakeham, N.; Yaśuoka, Hiroshi; Tokunaga, Y.; Kambe, S.; Bauer, E. D.; Thompson, J. D.

doi:10.1103/physrevb.92.121105

Cited by 23 publications

(37 citation statements)

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“…Indeed, the significance of the spatial coherence of the electronic state at around the impurity has been argued in a recent nuclear-quadrupole-resonance investigation of the Sn-and Cd-doped CeCoIn 5 . 42) 4.2 AFM quantum criticality in CeCo 1−x Ni x In 5 Here, we also discuss the nature of the NFL anomalies in CeCo 1−x Ni x In 5 . In pure CeCoIn 5 , the existence of the AFM-QCP at ∼ H c2 is inferred from the − ln T divergence in C p /T 19) and the weak T -linear increase in M/B with decreasing temperature.…”

Section: Relationship Between the Doped Ionic Position And Thementioning

confidence: 99%

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

et al. 2016

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The effect of off-plane impurity on superconductivity and non-Fermi-liquid (NFL) behavior in the layered heavyfermion compound CeCo 1−x Ni x In 5 is investigated by specific heat, magnetization, and electrical resistivity measurements. These measurements reveal that the superconducting (SC) transition temperature T c monotonically decreases from 2.3 K (x = 0) to 0.8 K (x = 0.20) with increasing x, and then the SC order disappears above x = 0.25. At the same time, the Ni substitution yields the NFL behavior at zero field for x = 0.25, characterized by the − ln T divergence in specific heat divided by temperature, C p /T , and magnetic susceptibility, M/B. The NFL behavior in magnetic fields for x = 0.25 is quite similar to that seen at around the SC upper critical field in pure CeCoIn 5 , suggesting that both compounds are governed by the same antiferromagnetic quantum criticality. The resemblance of the doping effect on the SC order among Ni-, Sn-, and Pt-substituted CeCoIn 5 supports the argument that the doped carriers are primarily responsible for the breakdown of the SC order. The present investigation further reveals the quantitative differences in the trends of the suppression of superconductivity between Ce(Co,Ni)In 5 and the other alloys, such as the rates of decrease in T c , dT c /dx, and specific heat jump at T c , d(∆C p /T c )/dx. We suggest that the occupied positions of the doped ions play an important role in the origin of these differences.

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Section: Relationship Between the Doped Ionic Position And Thementioning

confidence: 99%

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

et al. 2016

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“…Many experiments have suggested that the SC gap symmetry is d x 2 −y 2 -wave [15][16][17] and a few percents of the nonmagnetic 19] for the In site induce antiferromagnetic (AFM) ordering with suppression of the superconductivity, indicating that CeCoIn 5 is located near the AFM quantum critical point. However, the nature of pair-breaking effect of chemical substitutions in CeCoIn 5 remains controversial [20,21].The motivation of the present measurements is to check whether the NQR measurement is possible for the epitaxial film sample, and to investigate the magnetic and SC properties of the epitaxial film sample microscopically if NQR signals can be observed. In epitaxial films, the 2 strain due to the mismatch between the substrate and the films in general leads to some inhomogeneity in the electric field distribution, and thus the NQR studies will provide important information on the electronic properties and the pair-breaking effect of such inhomogeneity.…”

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confidence: 99%

“…In the substitution systems of Cd (hole doping) [CeCo(In 1−x Cd x ) 5 ], the superconductivity is destroyed at the critical concentration of x = 1.7% and long-range AFM ordering appears. 1% Cd-doping induces the small satellite structure in the 115 In-NQR spectrum [21,33,34], and largely modifies the spin-fluctuation properties in the normal state near the impurity sites.In Sn-doing (electron doping), ν Q of the main peak at the In(1) site decreases similarly to our film sample but the 1/T 1 drastically decreases by enhanced p-f hybridization due to the additional 5p electron of Sn atoms [21]. In these doping, impurities on CeCoIn 5 not only scatter the conduction electrons, but also modify their c-f hybridization [20,21].…”

mentioning

confidence: 99%

“…1% Cd-doping induces the small satellite structure in the 115 In-NQR spectrum [21,33,34], and largely modifies the spin-fluctuation properties in the normal state near the impurity sites.…”

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Magnetic and superconducting properties of a heavy-fermion CeCoIn5 epitaxial film probed by nuclear quadrupole resonance

et al. 2017

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Since the progress in the fabrication techniques of thin-films of exotic materials such as strongly correlated heavy-fermion compounds, microscopic studies of the magnetic and electronic properties inside the films have been needed. Herein, we report the first observation of 115 In nuclear quadrupole resonance (NQR) in an epitaxial film of the heavy-fermion superconductor CeCoIn5, for which the microscopic field gradient within the unit cell as well as magnetic and superconducting properties at zero field are evaluated. We find that the nuclear spin-lattice relaxation rate in the film is in excellent agreement with that of bulk crystals, whereas the NQR spectra show noticeable shifts and significant broadening indicating a change in the electric-field distribution inside the film. The analysis implies a displacement of In layers in the film, which however does not affect the magnetic fluctuations and superconducting pairing. This implies that inhomogeneity of the electronic field gradient in the film sample causes no pair breaking effect.Recently developed thin-film fabrication techniques, such as molecular beam epitaxy (MBE) and pulsed laser deposition, can be used to fabricate films consisting of not only simple substances but also multi-element materials. In thin-films, it is expected that the electronic states can be manipulated by effects that are difficult to achieve in bulk systems, such as two-dimensionality [1][2][3][4], surface states [5, 6], and proximity effects between the sample and the substrate [7]. Recently, epitaxial thin film and superlattice samples of heavy-fermion (HF) CeM In 5 (M = Co, Rh) have been fabricated. The superlattices consisting of CeM In 5 / normal-metal YbM In 5 have attracted interest for their anomalous features such as enhancement of the anisotropy of the superconducting (SC) upper critical field (H c2 ) [8][9][10] Although such attractive phenomena have been reported, unfortunately the experimental techniques to study the physical properties of film samples are quite limited. For example, neutron scattering experiments, which clarify magnetic properties decisively, usually require a huge volume of the sample, typically around the order of 1 cm 3 . Specific-heat and thermal-conductivity measurements, which are powerful tools to determine the SC gap structure, are also difficult since the huge contribution from the substrate masks the small contribution arising from the film sample.Nuclear quadrupole resonance (NQR) and nuclear magnetic resonance (NMR) are quite suitable measurements for film samples, if the material includes the NMR/NQR possible nuclei, because the measurements can detect the electronic state in only the film. In NMR/NQR experiments, the small sample volume reduces the signal intensity but the large surface area partially compensates the loss of signal intensity because NMR/NQR measurements mainly detect the surface region with several microns of depth. In addition, the experiments are able to select interesting block layers of the superlattice samples and ...

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A Quenched Disorder in the Quantum‐Critical Superconductor CeCoIn₅

Jung,

Jang,

Kim

et al. 2023

Advanced Science

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Emergent inhomogeneous electronic phases in metallic quantum systems are crucial for understanding high‐Tc superconductivity and other novel quantum states. In particular, spin droplets introduced by nonmagnetic dopants in quantum‐critical superconductors (QCSs) can lead to a novel magnetic state in superconducting phases. However, the role of disorders caused by nonmagnetic dopants in quantum‐critical regimes and their precise relation with superconductivity remain unclear. Here, the systematic evolution of a strong correlation between superconductive intertwined electronic phases and antiferromagnetism in Cd‐doped CeCoIn5 is presented by measuring current–voltage characteristics under an external pressure. In the low‐pressure coexisting regime where antiferromagnetic (AFM) and superconducting (SC) orders coexist, the critical current (Ic) is gradually suppressed by the increasing magnetic field, as in conventional type‐II superconductors. At pressures higher than the critical pressure where the AFM order disappears, Ic remarkably shows a sudden spike near the irreversible magnetic field. In addition, at high pressures far from the critical pressure point, the peak effect is not suppressed, but remains robust over the whole superconducting region. These results indicate that magnetic islands are protected around dopant sites despite being suppressed by the increasingly correlated effects under pressure, providing a new perspective on the role of quenched disorders in QCSs.

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Microscopic investigation of electronic inhomogeneity induced by substitutions in a quantum critical metalCeCoIn5

Cited by 23 publications

References 48 publications

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

Magnetic and superconducting properties of a heavy-fermion CeCoIn5 epitaxial film probed by nuclear quadrupole resonance

A Quenched Disorder in the Quantum‐Critical Superconductor CeCoIn₅

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Microscopic investigation of electronic inhomogeneity induced by substitutions in a quantum critical metalCeCoIn5

Cited by 23 publications

References 48 publications

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo1−xNixIn5

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo1−xNixIn5

Magnetic and superconducting properties of a heavy-fermion CeCoIn5 epitaxial film probed by nuclear quadrupole resonance

A Quenched Disorder in the Quantum‐Critical Superconductor CeCoIn5

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Product

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Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

A Quenched Disorder in the Quantum‐Critical Superconductor CeCoIn₅