Universal behavior in the Nernst effect of heavy fermion materials

Yang, Yi-feng

doi:10.1103/physrevresearch.2.033105

Cited by 3 publications

(3 citation statements)

References 62 publications

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“…The Nernst effect has a magnitude drastically exceeding what is expected for a multiband system. A large Nernst effect has been also discovered in some Bechgaard salts for fields oriented along the magic angles [5] and in some heavy-fermion compounds [21]. More interestingly, our results show that the Nernst effect in the organic metal α − (BEDT − TTF) 2 KHg(SCN) 4 has a very similar behavior and size compared to that in heavy-fermion superconductor CeCoIn 5 [22].…”

Section: Temperature Dependence Of the Nernst Effectsupporting

confidence: 73%

Giant angular Nernst Effect in the Organic Metal α-(BEDT-TT)2KHg(SCN)4

Krstovska¹,

Choi²,

Steven³

2023

Preprint

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We have detected a large Nernst effect in the CDW state of the multiband organic metal α−(BEDT−TT)2KHg(SCN)4. We find that there exists a significant gradient of charge relaxation processes that can generate a sizeable contribution adding especially to the transverse thermoelectric signal. Apart from the phonon drag, the energy relaxation processes governing the electron-phonon interactions and the momentum relaxation processes governing the charge mobility of the q1D group of carriers have a significant role in observing the large Nernst signal in the CDW state. The emphasised momentum relaxation dynamics in the low field CDW state is a clear indicator of a significant carrier mobility that can lead to the largest Nernst signal in this state. The momentum relaxation is reduced with increasing angle and magnetic field, i.e., in the high field CDW state which is reflected in the smaller Nernst effect amplitude. In this case only the phonon drag and electron-phonon interactions are contributing to the transverse thermoelectric signal. Our findings advance and change the previous observations on the complex properties of this organic metal.

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Section: Temperature Dependence Of the Nernst Effectsupporting

confidence: 73%

Giant angular Nernst Effect in the Organic Metal α-(BEDT-TT)2KHg(SCN)4

Krstovska¹,

Choi²,

Steven³

2023

Preprint

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“…Below the coherence temperature T * , the systems exhibit unusual two-fluid behavior [3,22]. This was first observed in La-doped CeCoIn 5 for the susceptibility and specific heat [23] and later extended to other physical properties in many heavy fermion compounds [16,17,[24][25][26][27][28][29][30][31][32]. The two fluids are a heavy electron fluid of the screened f moments and a spin liquid fluid formed of the unscreened ones [28].…”

Section: Two-fluid Phenomenologymentioning

confidence: 97%

“…f (T) may be viewed as an 'order parameter' measuring the f electron itinerancy, and the prefactor f 0 controls the effectiveness of the hybridization [28]. As shown in figure 3, the predicted universal scaling has been widely observed in the Knight shift anomaly [16] and the Nernst coefficient [17] in many heavy fermion compounds, and the Hall coefficient in some Cebased compounds [16,30] over a wide intermediate temperature range. This universality reflects a generic mechanism underlying the complicated heavy fermion physics.…”

Section: Two-fluid Phenomenologymentioning

confidence: 98%

An emerging global picture of heavy fermion physics

Yang¹

2022

J. Phys.: Condens. Matter

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Recent progresses using state-of-the-art experimental techniques have motivated a number of new insights on heavy fermion physics. This article gives a brief summary of the author's research along this direction. We discuss five major topics including: (1) Development of phase coherence and two-stage hybridization; (2) Two-fluid behavior and hidden universal scaling; (3) Quantum phase transitions and fractionalized heavy fermion liquid; (4) Quantum critical superconductivity; (5) Material-specific properties. These cover the most essential parts of heavy fermion physics and lead to an emerging global picture beyond conventional theories based on mean-field or local approximations.

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Giant Angular Nernst Effect in the Organic Metal α-(BEDT-TTF)2KHg(SCN)4

2023

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We have detected a large Nernst effect in the charge density wave state of the multiband organic metal α-(BEDT-TTF)2KHg(SCN)4. We find that apart from the phonon drag effect, the energy relaxation processes that govern the electron–phonon interactions and the momentum relaxation processes that determine the mobility of the q1D charge carriers have a significant role in observing the large Nernst signal in the CDW state in this organic metal. The emphasised momentum relaxation dynamics in the low field CDW state (CDW0) is a clear indicator of the presence of a significant carrier mobility that might be the main source for observation of the largest Nernst signal. The momentum relaxation is absent with increasing angle and magnetic field, i.e., in the high-field CDW state (CDWx) as evident from the much smaller Nernst effect amplitude in this state. In this case, only the phonon drag effect and electron–phonon interactions are contributing to the transverse thermoelectric signal. Our findings advance and change previous observations on the complex properties of this organic metal.

show abstract

Universal behavior in the Nernst effect of heavy fermion materials

Cited by 3 publications

References 62 publications

Giant angular Nernst Effect in the Organic Metal α-(BEDT-TT)2KHg(SCN)4

Giant angular Nernst Effect in the Organic Metal α-(BEDT-TT)2KHg(SCN)4

An emerging global picture of heavy fermion physics

Giant Angular Nernst Effect in the Organic Metal α-(BEDT-TTF)2KHg(SCN)4

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