Split Fermi Surface Properties of LaTGe<sub>3</sub> (T: Transition Metal) and PrCoGe<sub>3</sub> with the Non-centrosymmetric Crystal Structure

Kawai, Takazumi; Muranaka, Hiroshi; Endo, Toyoaki; Dung, Nguyen Duc; Doi, Yusuke; Ikeda, Shugo; Matsuda, Tatsuma D.; Haga, Yoshinori; Harima, Hisatomo; Settai, Rikio; Ōnuki, Yoshichika

doi:10.1143/jpsj.77.064717

Cited by 48 publications

(16 citation statements)

References 33 publications

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“…In the order of LaIrSi 3 and LaTGe 3 ͑T = Co, Rh, and Ir͒, [34][35][36] 2͉␣ Ќ ͉k F = 1100, 461, 511, and 1090 K for the ␣ branches and 2͉␣ Ќ ͉k F = 1250, 416, 505, and 1066 K for the ␤ branches. The large splittings in the Ir compounds may be explained by the large atomic number of Ir and the large 5d-electron population close to the nucleus.…”

Section: Resultsmentioning

confidence: 96%

Fermi surface inLaRhSi3andCeRhSi3

et al. 2008

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We report on de Haas-van Alphen ͑dHvA͒ effect measurements at ambient pressure and band-structure calculations for LaRhSi 3 and CeRhSi 3 , whose crystal structures lack space-inversion symmetry. For LaRhSi 3 , dHvA frequencies up to ϳ11 kT with effective masses up to ϳ1.6m e , where m e is the free-electron mass, are observed. The observed and the calculated Fermi surfaces are in satisfactory quantitative agreement. The energy splitting of bands due to the spin-orbit coupling is estimated to be of the order of 10 2 K. For CeRhSi 3 , dHvA frequencies up to ϳ12 kT with effective masses up to ϳ19m e are observed. The dHvA frequency branches are definitely different from those observed in LaRhSi 3 and are difficult to explain with the LaRhSi 3 Fermi surface. This leads to the conclusion that the Ce 4f electrons in CeRhSi 3 are itinerant in the antiferromagnetic state at ambient pressure. The Fermi surface resulting from a band-structure calculation in which the Ce 4f electrons are treated as itinerant can provide a plausible explanation for the observed frequency branches, although the quantitative agreement is rather limited. The comparison of the calculated density of states with the Sommerfeld coefficient gives the mass enhancement factor of 8.

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Section: Resultsmentioning

confidence: 96%

Fermi surface inLaRhSi3andCeRhSi3

et al. 2008

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“…The Fermi surface of the series LaTGe 3 (T: Fe, Co, Rh, Ir) has been reported in (Kawai et al, 2008a). All systems exhibit strong Rashba spin-orbit splitting.…”

Section: Cemx3mentioning

confidence: 99%

Superconducting phases off-electron compounds

2009

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Intermetallic compounds containing f-electron elements display a wealth of superconducting phases, that are prime candidates for unconventional pairing with complex order parameter symmetries. For instance, superconductivity has been found at the border of magnetic order as well as deep within ferro-and antiferromagnetically ordered states, suggesting that magnetism may promote rather than destroy superconductivity. Superconductivity near valence transitions, or in the vicinity of magneto-polar order are candidates for new superconductive pairing interactions such as fluctuations of the conduction electron density or the crystal electric field, respectively. The experimental status of the study of the superconducting phases of f-electron compounds is reviewed.

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“…This is because the dHvA amplitude becomes extremely small at ¼ 0 in the cantilever-type dHvA detecting system. 12,13) The dHvA frequency due to branch was ascribed to the same frequency due to branch .…”

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“…7) The dHvA experiment was performed by the torque method using the micro-cantilever with the modulation field of about 100 Oe and a modulation frequency of 11 Hz in a top loading dilution refrigerator with a 17 T superconducting magnet. 12,13) Figures 2(a) and 2(b) show the typical dHvA oscillations and the corresponding fast Fourier transformation (FFT) spectrum for the magnetic field H, tilted by ¼ 12 from [001] to [110]. Seven or eight dHvA branches labeled , ðÞ, , , ", , and were detected.…”

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Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe₂P₂

et al. 2009

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We succeeded in observing the de Haas-van Alphen (dHvA) effect in LaRuPO, which is a sister compound of iron-based oxypnictide superconductors. All the detected dHvA frequencies, which correspond to the maximum or minimum cross-sectional areas of Fermi surfaces, approximately follow the 1= cos dependence, where is a field-tilted angle from the tetragonal [001] direction to the [100] and [110] directions. The Fermi surfaces are found to consist of two cylindrical hole Fermi surfaces and two cylindrical electron Fermi surfaces on the basis of the similar cylindrical Fermi surfaces in LaFePO and the result of energy band calculations. The cyclotron effective mass in LaRuPO is light, ranging from 0.55 to 0.86 m 0 , which is compared with a large cyclotron mass in LaFePO. These two-dimensional Fermi surfaces in LaRuPO and LaFePO are also compared with the three-dimensional Fermi surfaces in LaFe 2 P 2 .

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Split Fermi Surface Properties of LaTGe₃ (T: Transition Metal) and PrCoGe₃ with the Non-centrosymmetric Crystal Structure

Cited by 48 publications

References 33 publications

Fermi surface inLaRhSi3andCeRhSi3

Fermi surface inLaRhSi3andCeRhSi3

Superconducting phases off-electron compounds

Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe₂P₂

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Split Fermi Surface Properties of LaTGe3 (T: Transition Metal) and PrCoGe3 with the Non-centrosymmetric Crystal Structure

Cited by 48 publications

References 33 publications

Fermi surface inLaRhSi3andCeRhSi3

Fermi surface inLaRhSi3andCeRhSi3

Superconducting phases off-electron compounds

Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe2P2

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Split Fermi Surface Properties of LaTGe₃ (T: Transition Metal) and PrCoGe₃ with the Non-centrosymmetric Crystal Structure

Two-Dimensional Fermi Surfaces in LaRuPO and LaFePO versus Three-Dimensional Fermi Surfaces in LaFe₂P₂