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

Journal Article · · Magnetochemistry
 [1];  [2];  [3]
  1. Ss. Cyril and Methodius University, Skopje (North Macedonia)
  2. Florida State University, Tallahassee, FL (United States)
  3. Florida State University, Tallahassee, FL (United States); Jakarta Utara DKI (Indonesia)
+ Show Author Affiliations
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.
Research Organization:
Florida State University, Tallahassee, FL (United States). National High Magnetic Field Laboratory (MagLab)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
OSTI ID:
2425015
Journal Information:
Magnetochemistry, Journal Name: Magnetochemistry Journal Issue: 1 Vol. 9; ISSN 2312-7481
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

References (18)

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Seebeck effect studies in the charge density wave state of organic conductor α-(BEDT–TTF)2KHg(SCN)4 journal December 2021
Unusual Seebeck and Nernst effects in the mixed state ofBi2−xPbxSr2Ca2Cu3Oδ journal June 1990
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Figures / Tables (8)

Figure 1(p. 3)figure Figure 1
Figure 2(p. 4)figure Figure 2
Figure 3(p. 4)figure Figure 3
Figure 4(p. 5)figure Figure 4
Figure 5(p. 7)figure Figure 5
Figure 6(p. 9)figure Figure 6
Figure 7(p. 10)figure Figure 7
Figure 8(p. 13)figure Figure 8

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Related Subjects

36 MATERIALS SCIENCE
Nernst effect
charge density wave
chemistry
materials science
organic metal
quantum oscillations
relaxation processes