Effects of La Substitution on the Energy Gaps and Superstructures of CeRhAs

Sasakawa, Tetsuya; Mine, Kaori; Shigetoh, Keisuke; Takabatake, Toshiro

doi:10.1143/jpsj.74.3329

J. Phys. Soc. Jpn.

2005

DOI: 10.1143/jpsj.74.3329

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Effects of La Substitution on the Energy Gaps and Superstructures of CeRhAs

Tetsuya Sasakawa

Kaori Mine

Keisuke Shigetoh

et al.

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Cited by 9 publications

(18 citation statements)

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“…For xX0:05, however, a broad single peak is observed. The destruction of the coherent Q 3 modulation at x between 0.02 and 0.05 is consistent with the macroscopic measurements [3]. Fig.…”

supporting

confidence: 89%

“…The large one of E g1 $2000 K in the optical conductivity exists even at room temperature. The small one of E g2 $300 K develops below T S3 , which manifests in various measurements as electrical resistivity, specific heat, Hall-coefficient, photo emission spectroscopy, electron tunneling, Raman scattering and NQR/NMR [1][2][3]. As-NQR indicates the full-gap of 300 K opening at ToT S3 [4].…”

mentioning

confidence: 98%

“…The V-shaped gap is ascribed to the anisotropic hybridization of conduction and f electron (c-f hybridization) [5,6]. Since CeNiSn and CeRhSb do not show any structural modulations, the gap formation in CeRhAs is pointed out to be owing to the superlattice structures, for example, charge density wave (CDW) [2,3].…”

mentioning

confidence: 99%

“…Fig. 1 exhibits the x-dependence of the As-NQR spectrum at 5 K. As the nuclear spin of 75 As is 3 2 , one NQR line corresponds to one site. The three peaks for x ¼ 0 owing to the Q 3 modulation are retained up to x ¼ 0.02 even though the spectral broadening becomes significant.…”

mentioning

confidence: 99%

See 3 more Smart Citations

As-NQR Study of La Substitution Effect on the Interplay between Gap Formation and Structural Modulation in

Saiki

Matsumura

Kato

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…For xX0:05, however, a broad single peak is observed. The destruction of the coherent Q 3 modulation at x between 0.02 and 0.05 is consistent with the macroscopic measurements [3]. Fig.…”

supporting

confidence: 89%

mentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

As-NQR Study of La Substitution Effect on the Interplay between Gap Formation and Structural Modulation in

Saiki

Matsumura

Kato

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…Recently La-substituted Ce 1Àx La x RhAs single crystals have been synthesized [2]. It has been found that a semiconducting behavior almost disappears with a La concentration as low as x$0.02 [2]. In order to elucidate how the energy gap in CeRhAs collapses by the La substitution, we have conducted a high-resolution resonance-photoemission spectroscopy (PES) study of Ce 1Àx La x RhAs (0pxp0.05).…”

mentioning

confidence: 99%

High-resolution photoemission study of Ce1−xLaxRhAs: A collapse of the energy gap in the Kondo semiconductor

Shimada

Higashiguchi

Fujimori

et al. 2006

Physica B: Condensed Matter

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High-resolution resonance-photoemission spectroscopy has been performed on the Ce 1Àx La x RhAs (0pxp0.05) single crystal to elucidate a collapse of the energy gap in the Kondo semiconductor CeRhAs by La substitution. With increasing x, the spectral intensity of the Ce4f 1 derived states near the Fermi level decreases and new 4f derived spectral feature appears at a higher binding energy. The Rh4d-derived states, on the other hand, are not significantly changed by the substitution. New 4f-derived states have incoherent nature, which is responsible for the collapse of the semiconducting state for x4$0.02. rThe orthorhombic CeRhAs, known as a Kondo semiconductor, has attracted much interest for its unusual energy-gap formation associated with the successive firstorder-structural-phase transitions [1]. Recently La-substituted Ce 1Àx La x RhAs single crystals have been synthesized [2]. It has been found that a semiconducting behavior almost disappears with a La concentration as low as x$0.02 [2]. In order to elucidate how the energy gap in CeRhAs collapses by the La substitution, we have conducted a high-resolution resonance-photoemission spectroscopy (PES) study of Ce 1Àx La x RhAs (0pxp0.05).Single crystals of Ce 1Àx La x RhAs (x ¼ 0, 0.003, 0.02, 0.05) were grown by the Bridgman method [1,2]. The 3d-4f resonance PES experiments (hn ¼ 870-881 eV) were done at the beamline BL23SU of SPring-8 [3], and the 4d-4f resonance PES experiments (hn ¼ 122 eV) at the beamline BL-1 of HiSOR [4]. The sample temperature was kept at 10-20 K, and the overall energy resolution was set at DE ¼ 20 meV (hn ¼ 122 eV) and 100 meV (hn ¼ 870-881 eV). Clean sample surfaces were obtained by fracturing the sample in the ultrahigh vacuum. Fig. 1 shows on-resonance PES spectra of Ce 1Àx La x RhAs at hn ¼ 881 and 122 eV. Due to large resonance enhancement, one can regard these spectra as the Ce4f partial spectra. We have normalized these spectra to the area for the binding energy (E B ) range of E B $0-9 eV. A peak structure near E F for x ¼ 0 sample at hn ¼ 881 eV corresponds to the Ce4f 1 final state, which exhibits a hybridization gap of $100 meV. Our previous measurements indicate that the energy gap is originated from As4p, Rh4d and Ce4f hybridization [4,5], in agreement with the band-structure calculation [6]. A broad spectral feature at $2.5 eV is derived from the Ce4f 0 final state and partly from the Rh4d states. As the Ce is replaced by La from x ¼ 0 to 0.003, the intensity of the peak near E F is reduced. From x ¼ 0.003 to x ¼ 0.02, a drastic change has been observed; the peak intensity is shifted to the higher binding ARTICLE IN PRESS www.elsevier.com/locate/physb 0921-4526/$ -see front matter r

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Sb-NMR/NQR study of CeIrSb

Kawasaki

Tanaka

Izumi

et al. 2007

Journal of Physics and Chemistry of Solids

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Effects of La Substitution on the Energy Gaps and Superstructures of CeRhAs

Cited by 9 publications

References 22 publications

As-NQR Study of La Substitution Effect on the Interplay between Gap Formation and Structural Modulation in

As-NQR Study of La Substitution Effect on the Interplay between Gap Formation and Structural Modulation in

High-resolution photoemission study of Ce1−xLaxRhAs: A collapse of the energy gap in the Kondo semiconductor

Sb-NMR/NQR study of CeIrSb

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