Magnetic properties of YbTGe (T=Rh, Cu, Ag)

Katoh, K.; Mano, Y.; Nakano, Koji; Terui, G.; Niide, Yuzuru; Ochiai, Akira

doi:10.1016/s0304-8853(03)00501-8

Cited by 51 publications

(46 citation statements)

References 18 publications

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“…A scenario that the first excited doublet is located at 12 meV above the ground doublet is consistent with the Schottky-type specific heat anomaly around 60 K reported in Ref. 1. No other significant peak structures were observed up to 60 meV.…”

supporting

confidence: 91%

“…[1][2][3][4][5] One major aspect is the coexistence of Kondo effect and geometrical frustration in the kagomé-latticelike triangular coordination of Yb atoms in ZiNiAltype crystal structure (hexagonal space group P62m). Heavy electron mass is observed which reaches about 400 mJ/mol K 2 at 2 K followed by successive magnetic phase transitions at quite low temperatures of 0.8 K and 0.65 K.…”

mentioning

confidence: 99%

“…The details of the sample preparation and characterization are described in Ref. 1. The scattering intensity was put on an absolute scale in mb/meV/sr/Yb by comparing the intensity with that of the incoherent scattering from a vanadium standard sample.…”

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confidence: 99%

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Spin Fluctuation and Crystal Field Excitation of Heavy-Fermion Compound YbAgGe Studied by Inelastic Neutron Scattering

et al. 2004

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Inelastic neutron scattering experiment has been performed on a new heavy fermion compound YbAgGe for a polycrystalline sample at zero magnetic field. A quasielastic scattering and a crystal field excitation at 12 meV was observed. Both of them are broadened with an intrinsic width of 0.9 meV at 1.5 K which increases to about 3 meV at 300 K. The temperature dependence follows Γ0 + A √ T typically observed in Kondo systems. Crystal field parameters were also deduced. To explain the result that only one excitation is observed at 12 meV, it is concluded that the B22 term should be the main component.KEYWORDS: heavy fermion, YbAgGe, spin fluctuation, crystal field, inelastic neutron scattering A ternary rare-earth compound YbAgGe has been attracting interest as a new Yb-based heavy-fermion material.1-5 One major aspect is the coexistence of Kondo effect and geometrical frustration in the kagomé-latticelike triangular coordination of Yb atoms in ZiNiAltype crystal structure (hexagonal space group P62m). Heavy electron mass is observed which reaches about 400 mJ/mol K 2 at 2 K followed by successive magnetic phase transitions at quite low temperatures of 0.8 K and 0.65 K.1, 2 The two step transition is considered to be a characteristic of the geometrical frustration as observed in isostructural YbPtIn and YbRhSn.6, 7 Another aspect of importance is the magnetic field induced non-Fermiliquid (NFL) behavior which is typically manifested in the − ln T dependence of magnetic specific heat C mag /T in a wide temperature range from above 10 K to below 1 K.3 YbAgGe offers a good platform to study a crossover from magnetically ordered state with small moments to a Fermi-liquid (FL) state through a quantum critical point (QCP), as well as recently discovered NFL compound YbRh 2 Si 2 . 8Characteristics of Kondo effect and heavy fermion are typically manifested in the magnetic specific heat.1 At low temperatures C mag /T increases with decreasing temperature in proportion to − ln T from about 15 K to 3 K. Katoh et al. analyzed the data with a single-ion Kondo model of J = 1/2 for T K = 24 K. While the magnetic susceptibility at high temperatures follows Curie-Weiss behavior of well localized moment, χ(T ) for H a exhibits a weak maximum around 4 K, which suggests disappearance of the local moment. Although this is reminiscent of isostructural heavy fermion compound YbCuAl, 9YbAgGe is different in that a well defined crystal field (CF) anomaly is observed; C mag (T ) exhibits a Schottkytype peak at around 60 K, which indicates the first excited CF level at around 110 K.1 Our final goal in YbAgGe will be to understand the whole process from the local-moment formation at zero field to the FL state * E-mail address: tmatsu@iiyo.phys.tohoku.ac.jp at high fields through the QCP where the NFL state is observed. For this purpose, it is of essential importance to study correlation and fluctuation of the magnetic moments by inelastic neutron scattering (INS). The aim of the present study, as a starting subject, is to investigate spin fluc...

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supporting

confidence: 91%

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confidence: 99%

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Spin Fluctuation and Crystal Field Excitation of Heavy-Fermion Compound YbAgGe Studied by Inelastic Neutron Scattering

et al. 2004

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“…[26][27][28][29] Inelastic neutron scattering experiments on YbAgGe have proposed the CEF level scheme with doublet levels located approximately at 0-140-230-330 K. 30 This scheme is consistent with the specific heat analysis ͑0-110-190-335 K͒ involving combined Kondo effect ͑T K =24 K͒ and electronic Schottky contributions. 7 Thus, the doublet ground state and T K are well separated from the first excited CEF level. From the TEP measurements shown in Fig.…”

Section: Discussionmentioning

confidence: 95%

“…The hexagonal HF metal YbAgGe, with a Kondo temperature of T K ϳ 25 K, orders antiferromagnetically below ϳ1 K. 6,7 The H-T phase diagram of YbAgGe for H ʈ ab is shown in Fig. 1, constructed from the electrical resistivity ͓ ͑T , H͔͒, 6,8 magnetizaion ͓M͑T , H͔͒, 9 specific heat ͓C p ͑T͔͒, 6,9 and Hall resistivity ͓ H ͑T , H͔͒ ͑Refs.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric power investigations of YbAgGe across the quantum critical point

2010

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The magnetic field and temperature dependences of the thermoelectric power (TEP) of the antiferromagnetically ordered heavy fermion compound YbAgGe are measured across the field-induced quantum critical point. These TEP measurements reproduce the earlier H-T phase diagram and identify an additional domelike phase between ∼45and ∼70 kOe. On the low-field side of this region, H>Hc∼45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H≈70 kOe, a nonFermi-liquid state is evidenced as the logarithmic temperature dependence of S(T)/T, in agreement with previous specific heat results C(T)/T∝−log(T). For higher fields, H>70 kOe, the observed large value of α, S(T)=αT, is indicative of the heavy fermion state and shows a correlation with C(T)/T. Keywords Physics and Astronomy Disciplines Condensed Matter Physics CommentsThis article is from Physical Review B 82 (2010) The magnetic field and temperature dependences of the thermoelectric power ͑TEP͒ of the antiferromagnetically ordered heavy fermion compound YbAgGe are measured across the field-induced quantum critical point. These TEP measurements reproduce the earlier H-T phase diagram and identify an additional domelike phase between ϳ45 and ϳ70 kOe. On the low-field side of this region, H Ͼ H c ϳ 45 kOe, the sign of the TEP changes from negative to positive; on the high-field side of this region, H Ϸ 70 kOe, a non-Fermi-liquid state is evidenced as the logarithmic temperature dependence of S͑T͒ / T, in agreement with previous specific heat results C͑T͒ / T ϰ −log͑T͒. For higher fields, H Ͼ 70 kOe, the observed large value of ␣, S͑T͒ = ␣T, is indicative of the heavy fermion state and shows a correlation with C͑T͒ / T.

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Magnetic phenomena in equiatomic ternary rare earth compounds

Gupta

2023

Handbook of Magnetic Materials

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Magnetic properties of YbTGe (T=Rh, Cu, Ag)

Cited by 51 publications

References 18 publications

Spin Fluctuation and Crystal Field Excitation of Heavy-Fermion Compound YbAgGe Studied by Inelastic Neutron Scattering

Spin Fluctuation and Crystal Field Excitation of Heavy-Fermion Compound YbAgGe Studied by Inelastic Neutron Scattering

Thermoelectric power investigations of YbAgGe across the quantum critical point

Magnetic phenomena in equiatomic ternary rare earth compounds

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