Two Energy Scales and Slow Crossover in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>YbAl</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Cornelius, Andrew; Lawrence, J. M.; Ebihara, Takao; Riseborough, Peter S.; Booth, C. H.; Hundley, M. F.; Pagliuso, P. G.; Sarrao, J. L.; Thompson, J. D.; Jung, Myung‐Hwa; Lacerda, A.; Kwei, G. H.

doi:10.1103/physrevlett.88.117201

Cited by 88 publications

(98 citation statements)

References 18 publications

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“…This intermetallic presents a broad maximum around 100 K in the magnetic susceptibility and in the magnetic contribution to specific heat. [16][17][18][19][20] A crossover slower than predicted by the Anderson impurity model from the low-temperature Fermi-liquid regime to the high-temperature local-moment regime was also observed. 17 Moreover, anomalies appearing in the transport and magnetic properties at low temperatures were attributed to coherence effects, which are suppressed by the magnetic field and chemical disorder.…”

Section: Introductionmentioning

confidence: 79%

“…[16][17][18][19][20] A crossover slower than predicted by the Anderson impurity model from the low-temperature Fermi-liquid regime to the high-temperature local-moment regime was also observed. 17 Moreover, anomalies appearing in the transport and magnetic properties at low temperatures were attributed to coherence effects, which are suppressed by the magnetic field and chemical disorder. 19 In addition to these exciting properties, Yb 3+ ion presents the mirror electronic configuration with respect to Ce 3+ and provides complementary information especially when different parameters are tuned typically by diluting and/or applying pressure.…”

Section: Introductionmentioning

confidence: 79%

“…For comparison purposes, the uncorrected data of unmilled alloy are also presented, showing a characteristic upturn of the Yb 2 O 3 impurity, which is more evident for T Ͻ 50 K. This sample presents two maxima around 121 and 17 K as already reported for this material. [16][17][18][19] The low-temperature maximum is associated with lattice coherence effects being very sensitive to disorder and magnetic field and revealing a good quality of the sample. 17 This maximum is virtually absent in the 20 h milled alloy and practically disappears for 120 h of milling time samples ͑probably as a result of the disorder increase͒, which is induced by the milling process.…”

Section: B DC Magnetic Susceptibilitymentioning

confidence: 99%

“…[16][17][18][19] The low-temperature maximum is associated with lattice coherence effects being very sensitive to disorder and magnetic field and revealing a good quality of the sample. 17 This maximum is virtually absent in the 20 h milled alloy and practically disappears for 120 h of milling time samples ͑probably as a result of the disorder increase͒, which is induced by the milling process. [4][5][6][7][8][9] Regarding the high-temperature maximum ͑usually associated with the Kondo temperature in these IV systems͒, 18 there is a slight decrease ͑1%-2%͒ in the position directly affected by the mentioned Curie-Weiss behavior of the Yb 2 O 3 .…”

Section: B DC Magnetic Susceptibilitymentioning

confidence: 99%

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Reduction of the Yb valence inYbAl3nanoparticles

et al. 2008

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Measurements of specific heat, dc magnetic susceptibility, and Yb L II and L III x-ray absorption near-edge structure ͑XANES͒ and extended x-ray absorption fine structure ͑EXAFS͒ on YbAl 3 milled alloys are reported. X-ray diffraction patterns are consistent with a reduction in particle size down to 10 nm and an increase in the lattice strain up to 0.4% for 120 h of milling time. A decrease in the mean valence from 2.86 for the unmilled alloy to 2.70 for 120 h milled YbAl 3 is obtained from the analysis of XANES spectra. From the analysis of spectra in the EXAFS region, an increase in the mean-square disorder of neighbor distance with milling time is detected in good agreement with the results of x-ray diffraction. Size effects strongly influence the magnetic and thermal properties. The value for the maximum of the magnetic susceptibility decreases around 30% for 120 h milled alloy and an excess specific heat, with a peak around 40 K in the milled samples, is derived. These changes in the physical properties along the milled YbAl 3 alloys are associated with the reduction in particle size. Such a reduction leads to the existence of a large number of Yb 2+ atoms at the surface with respect to the bulk affecting the overall electronic state.

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Section: Introductionmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 79%

Section: B DC Magnetic Susceptibilitymentioning

confidence: 99%

Section: B DC Magnetic Susceptibilitymentioning

confidence: 99%

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Reduction of the Yb valence inYbAl3nanoparticles

et al. 2008

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“…1 Recent theoretical studies 24 of the Kondo Lattice Model (KLM) and Anderson Lattice Model (ALM) suggest that the thermodynamic properties can differ in at least two ways from the predictions of the Anderson Impurity Model (AIM). First, a new low temperature scale T^h for the onset of Fermi liquid coherence with T^h •< TK ■ Second, as n c decreases, the crossover from low temperature Fermi liquid behavior to high temperature local moment behavior becomes slower than predicted for the AIM.…”

Section: A Observation Of Multiple E Nergy Scales In Ybal3mentioning

confidence: 99%

Studies of Correlated-Electron Systems in High Magnetic Fields and at High Pressures

Cornelius¹

2008

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Ms. Becker:Under this cover you will find a copy of my final report summarizing the results from the past four years of an EPSCoR State-DOE Laboratory Partnership Award Studies of Correlated- Electron Systems in High Magnetic Fields and at High Pressures. This is DOE Award NumberDE-FG02-00ER45835 with a total award amount of $219,033 for the period 8/00-8/03 with a one year no cost extension). As this is the end of the award, I would like to thank DOE-BES and the EPSCoR program for the opportunity to perform the research outlined in this report. I feel overall that the project has been a great success and I look forward to continuing a working relationship

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Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single‐Crystalline Fe_1−xCo_xSi Nanowire

Lee

Chang

et al. 2011

Chemistry An Asian Journal

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We report unconventional magnetotransport properties of an individual Fe(1-x)Co(x)Si nanowire. We have studied the dependence of the resistivity on the angle between the directions of the magnetization and electrical current below the Curie temperature (T(C)). The observed anisotropic magnetoresistance (MR) ratio is negative, thereby indicating that the conduction electrons in a minority spin band of the Fe(1-x)Co(x)Si nanowire dominantly contribute to the transport. Unlike typical ferromagnets, positive MR is observed in the overall temperature range. MR curves are linear below T(C) and show a quadratic form above T(C), which can be explained by the change of density of states that arises as the band structures of the Fe(1-x)Co(x)Si nanowire shift under a magnetic field. The temperature dependence of the resistivity curve is sufficiently explained by the Kondo effect. The Kondo temperature of the Fe(1-x)Co(x)Si nanowire is lower than that of the bulk state due to suppression of the Kondo effect. The high single crystallinity of Fe(1-x)Co(x)Si nanowires allowed us to observe and interpret quite subtle variations in the prominent intrinsic transport properties.

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Two Energy Scales and Slow Crossover inYbAl3

Cited by 88 publications

References 18 publications

Reduction of the Yb valence inYbAl3nanoparticles

Reduction of the Yb valence inYbAl3nanoparticles

Studies of Correlated-Electron Systems in High Magnetic Fields and at High Pressures

Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single‐Crystalline Fe_1−xCo_xSi Nanowire

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Two Energy Scales and Slow Crossover inYbAl3

Cited by 88 publications

References 18 publications

Reduction of the Yb valence inYbAl3nanoparticles

Reduction of the Yb valence inYbAl3nanoparticles

Studies of Correlated-Electron Systems in High Magnetic Fields and at High Pressures

Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single‐Crystalline Fe1−xCoxSi Nanowire

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Magnetotransport Properties and Kondo Effect Observed in a Ferromagnetic Single‐Crystalline Fe_1−xCo_xSi Nanowire