Yb4As3 and Yb4(As0.71Sb0.29)3, two ways to heavy-fermion character

R. Pittini; M. Ikezawa; A. Ochiai; H. Aoki; T. Suzuki

doi:10.1016/S0304-8853(97)00560-X

Yb₄As₃ and Yb₄(As_0.71Sb_0.29)₃, two ways to heavy-fermion character

R. Pittini, M. Ikezawa, A. Ochiai, H. Aoki, T. Suzuki

Research output: Contribution to journal › Article › peer-review

Abstract

After the observation of heavy-fermion characteristics in the charge-ordered phase of Yb₄As₃, it is surprising that Yb₄(As_0.71Sb_0.29)₃ shows heavy-fermion behavior, though the charge ordering is suppressed. To shed more light onto this enigma, we measured the optical reflectivity of Yb₄(As_0.71Sb_0.29)₃ at several temperatures down to 15 K in the photon energy range from 1 meV to 5.5 eV. The comparison of the optical functions of Yb₄As₃ and Yb₄(As_0.71Sb_0.29)₃ revealed decisive differences in the far-IR region. For the latter material, we found an hybridization gap of 3.3 meV, absent in Yb₄As₃. The effective mass of the conduction carriers takes the temperature-independent value of 2 m_e in Yb₄As₃, while m* shows a logarithmic temperature dependency and reaches 80 m_e at 15 K in Yb₄(As_0.71Sb_0.29)₃. This proves that two different mechanisms lead to a large y value in Yb₄As₃ and Yb₄(As_0.71Sb_0.29)₃.

Original language	English
Pages (from-to)	345-346
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	177-181
Issue number	PART 1
DOIs	https://doi.org/10.1016/S0304-8853(97)00560-X
Publication status	Published - 1998 Jan
Externally published	Yes

Keywords

Electronic phase transitions
Heavy fermions
Optical spectroscopy
Rare-earth pnictides

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/S0304-8853(97)00560-X

Cite this

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title = "Yb4As3 and Yb4(As0.71Sb0.29)3, two ways to heavy-fermion character",

abstract = "After the observation of heavy-fermion characteristics in the charge-ordered phase of Yb4As3, it is surprising that Yb4(As0.71Sb0.29)3 shows heavy-fermion behavior, though the charge ordering is suppressed. To shed more light onto this enigma, we measured the optical reflectivity of Yb4(As0.71Sb0.29)3 at several temperatures down to 15 K in the photon energy range from 1 meV to 5.5 eV. The comparison of the optical functions of Yb4As3 and Yb4(As0.71Sb0.29)3 revealed decisive differences in the far-IR region. For the latter material, we found an hybridization gap of 3.3 meV, absent in Yb4As3. The effective mass of the conduction carriers takes the temperature-independent value of 2 me in Yb4As3, while m* shows a logarithmic temperature dependency and reaches 80 me at 15 K in Yb4(As0.71Sb0.29)3. This proves that two different mechanisms lead to a large y value in Yb4As3 and Yb4(As0.71Sb0.29)3.",

keywords = "Electronic phase transitions, Heavy fermions, Optical spectroscopy, Rare-earth pnictides",

author = "R. Pittini and M. Ikezawa and A. Ochiai and H. Aoki and T. Suzuki",

year = "1998",

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doi = "10.1016/S0304-8853(97)00560-X",

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T1 - Yb4As3 and Yb4(As0.71Sb0.29)3, two ways to heavy-fermion character

AU - Pittini, R.

AU - Ikezawa, M.

AU - Ochiai, A.

AU - Aoki, H.

AU - Suzuki, T.

PY - 1998/1

Y1 - 1998/1

N2 - After the observation of heavy-fermion characteristics in the charge-ordered phase of Yb4As3, it is surprising that Yb4(As0.71Sb0.29)3 shows heavy-fermion behavior, though the charge ordering is suppressed. To shed more light onto this enigma, we measured the optical reflectivity of Yb4(As0.71Sb0.29)3 at several temperatures down to 15 K in the photon energy range from 1 meV to 5.5 eV. The comparison of the optical functions of Yb4As3 and Yb4(As0.71Sb0.29)3 revealed decisive differences in the far-IR region. For the latter material, we found an hybridization gap of 3.3 meV, absent in Yb4As3. The effective mass of the conduction carriers takes the temperature-independent value of 2 me in Yb4As3, while m* shows a logarithmic temperature dependency and reaches 80 me at 15 K in Yb4(As0.71Sb0.29)3. This proves that two different mechanisms lead to a large y value in Yb4As3 and Yb4(As0.71Sb0.29)3.

AB - After the observation of heavy-fermion characteristics in the charge-ordered phase of Yb4As3, it is surprising that Yb4(As0.71Sb0.29)3 shows heavy-fermion behavior, though the charge ordering is suppressed. To shed more light onto this enigma, we measured the optical reflectivity of Yb4(As0.71Sb0.29)3 at several temperatures down to 15 K in the photon energy range from 1 meV to 5.5 eV. The comparison of the optical functions of Yb4As3 and Yb4(As0.71Sb0.29)3 revealed decisive differences in the far-IR region. For the latter material, we found an hybridization gap of 3.3 meV, absent in Yb4As3. The effective mass of the conduction carriers takes the temperature-independent value of 2 me in Yb4As3, while m* shows a logarithmic temperature dependency and reaches 80 me at 15 K in Yb4(As0.71Sb0.29)3. This proves that two different mechanisms lead to a large y value in Yb4As3 and Yb4(As0.71Sb0.29)3.

KW - Electronic phase transitions

KW - Heavy fermions

KW - Optical spectroscopy

KW - Rare-earth pnictides

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