Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5

Kawasaki, Shinji; T, Oka; Sorime, Akira; Kogame, Yuji; Uemoto, Kazuhiro; Matano, Kazuaki; Guo, Jing; Cai, Shengbao; Sun, Liling; Sarrao, J. L.; Thompson, J. D.; 鄭, 国慶

doi:10.1038/s42005-020-00418-x

Cited by 11 publications

(4 citation statements)

References 76 publications

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“…In unconventional superconductors with line nodes in the gap function, impurity scattering can bring about a finite density of states. In fact, when the residual density of states is quite large, the temperature dependence of 1/T 1 similar to our result was observed [45].…”

Section: Band Calculationssupporting

confidence: 91%

Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure

Matano,

Ogura,

Fountainea

et al. 2021

Preprint

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We report the 11 B nuclear magnetic resonance (NMR) measurements on non-centrosymmetric superconductors NbRh 2 B 2 (superconducting transition temperature T c = 7.8 K) and TaRh 2 B 2 (T c = 5.9 K) with a chiral crystal structure. The nuclear spin-lattice relaxation rate 1/T 1 shows no coherence peak below T c , which suggests unconventional nature of the superconductivity. In the normal state, 1/T 1 T increases with decreasing temperature T at low temperatures below T = 200 K for TaRh 2 B 2 and T = 15 K for NbRh 2 B 2 , while the Knight shift remains constant. These results suggest the presence of antiferromagnetic spin fluctuations in both compounds. The stronger spin fluctuations in TaRh 2 B 2 compared to NbRh 2 B 2 is discussed in the context of spin-orbit coupling.

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Section: Band Calculationssupporting

confidence: 91%

Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure

Matano,

Ogura,

Fountainea

et al. 2021

Preprint

Self Cite

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“…Evidence for a Kondo-breakdown type of quantum criticality has been found in a few heavy-fermion materials, notably CeCu 6-x Au x 12 , YbRh 2 Si 2 13,14 , and CeRhIn 5 ; 15,16 whereas, a phase diagram like that in Fig. 1a appears in CeIn 3 17 , Co-doped YbRh 2 Si 2 18 and Ir-doped CeRhIn 5 19,20 . Among examples representative of Fig.…”

mentioning

confidence: 80%

Evidence for charge delocalization crossover in the quantum critical superconductor CeRhIn5

Wang,

Park,

Kim

et al. 2023

Nat Commun

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The nature of charge degrees-of-freedom distinguishes scenarios for interpreting the character of a second order magnetic transition at zero temperature, that is, a magnetic quantum critical point (QCP). Heavy-fermion systems are prototypes of this paradigm, and in those, the relevant question is where, relative to a magnetic QCP, does the Kondo effect delocalize their f-electron degrees-of-freedom. Herein, we use pressure-dependent Hall measurements to identify a finite-temperature scale Eloc that signals a crossover from f-localized to f-delocalized character. As a function of pressure, Eloc(P) extrapolates smoothly to zero temperature at the antiferromagnetic QCP of CeRhIn5 where its Fermi surface reconstructs, hallmarks of Kondo-breakdown criticality that generates critical magnetic and charge fluctuations. In 4.4% Sn-doped CeRhIn5, however, Eloc(P) extrapolates into its magnetically ordered phase and is decoupled from the pressure-induced magnetic QCP, which implies a spin-density-wave (SDW) type of criticality that produces only critical fluctuations of the SDW order parameter. Our results demonstrate the importance of experimentally determining Eloc to characterize quantum criticality and the associated consequences for understanding the pairing mechanism of superconductivity that reaches a maximum Tc in both materials at their respective magnetic QCP.

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“…Evidence for a Kondo-breakdown type of quantum criticality has been found in a few heavy-fermion materials, notably CeCu6-xAux 12 , YbRh2Si2 13,14 , and CeRhIn5 15,16 ; whereas, a phase diagram like that in Fig. 1a appears in CeIn3 17 , Co-doped YbRh2Si2 18 and Ir-doped CeRhIn5 19,20 . Among examples representative of Fig.…”

mentioning

confidence: 85%

Analysing Capacity Factors for Urban Sustainability Transformations : The ‘Eco-capital Suwon’ in South Korea

Kang¹

2021

kieae

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The nature of charge degrees-of-freedom distinguishes scenarios for interpreting the character of a second order magnetic transition at zero temperature, that is, a magnetic quantum critical point (QCP). Heavy-fermion systems are prototypes of this paradigm, and in those, the relevant question is where, relative to a magnetic QCP, does the Kondo effect delocalize their f-electron degrees-of-freedom. Herein, we use pressure-dependent Hall measurements to identify a finite-temperature scale Eloc that signals a crossover from f-localized to f-delocalized character. As a function of pressure, Eloc(P) extrapolates smoothly to zero temperature at the antiferromagnetic QCP of CeRhIn5 where its Fermi surface reconstructs, hallmarks of Kondo-breakdown criticality that generates critical magnetic and charge fluctuations. In 4.4% Sn-doped CeRhIn5, however, Eloc(P) extrapolates into its magnetically ordered phase and is decoupled from the pressureinduced magnetic QCP, which implies a spin-density-wave (SDW) type of criticality that produces only critical fluctuations of the SDW order parameter. Our results demonstrate the importance of experimentally determining Eloc to characterize quantum criticality and the associated consequences for understanding the pairing mechanism of superconductivity that reaches a maximum Tc in both materials at their respective magnetic QCP.

show abstract

Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5

Cited by 11 publications

References 76 publications

Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure

Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure

Evidence for charge delocalization crossover in the quantum critical superconductor CeRhIn5

Analysing Capacity Factors for Urban Sustainability Transformations : The ‘Eco-capital Suwon’ in South Korea

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