Evidence of a heavy fermion state in the disordered Ce-alloy system without translation symmetry

Amakai, Yusuke; Murayama, S.; Obi, Y.; Takano, Hideaki; Takanashi, Kōki

doi:10.1103/physrevb.79.245126

Cited by 7 publications

(9 citation statements)

References 26 publications

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“…Indeed, there are examples of heavy fermion systems that show suppression of the downturn by introducing even a small doping amount 38,39 , i.e. small disorder.…”

Section: B Kondo Scatteringmentioning

confidence: 99%

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Wolgast

Öztürk

et al. 2015

Phys. Rev. B

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The recent conjecture of a topologically-protected surface state in SmB 6 and the verification of robust surface conduction below 4 K have prompted a large effort to understand the surface states.Conventional Hall transport measurements allow current to flow on all surfaces of a topological insulator, so such measurements are influenced by contributions from multiple surfaces of varying transport character. Instead, we study magnetotransport of SmB 6 using a Corbino geometry, which can directly measure the conductivity of a single, independent surface. Both (011) and (001) crystal surfaces show a strong negative magnetoresistance at all magnetic field angles measured.The (011) surface has a carrier mobility of 122 cm 2 /V·sec with a carrier density of 2.5×10 13 cm −2 , which are significantly smaller than indicated by Hall transport studies. This mobility value can explain a failure so far to observe Shubnikov-de Haas oscillations. Analysis of the angle-dependence of conductivity on the (011) surface suggests a combination of a field-dependent enhancement of the carrier density and a suppression of Kondo scattering from native oxide layer magnetic moments as the likely origin of the negative magnetoresistance. Our results also reveal a hysteretic behavior whose magnitude depends on the magnetic field sweep rate and temperature. Although this feature becomes smaller when the field sweep is slower, does not disappear or saturate during our slowest sweep-rate measurements, which is much slower than a typical magnetotransport trace.These observations cannot be explained by quantum interference corrections such as weak antilocalization, but are more likely due to an extrinsic magnetic effect such as the magnetocaloric effect or glassy ordering.

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“…Indeed, there are examples of heavy fermion systems that show suppression of the downturn by introducing even a small doping amount 38,39 , i.e. small disorder.…”

Section: B Kondo Scatteringmentioning

confidence: 99%

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Wolgast

Öztürk

et al. 2015

Phys. Rev. B

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“…3, the 1/(T 1 T ) of 55 Mn NMR in amorphous Ce 62 Y 19 Mn 19 increases rapidly in proportion to inverse square root of temperature with decreasing temperature, whereas it keeps almost constant below about 6 K, which ascribes to the heavy-fermion state. On the other hand, in amorphous Ce 59 Mn 41 , it has been found that the 1/(T 1 T ) of 55 Mn NMR increases rapidly in proportion to the Curie-Weiss law (T c = -0.4 K) with decreasing temperature and it keeps almost constant below about 10 K [7]. The temperature dependence of the 1/(T 1 T ) in proportion to inverse square root of temperature in amorphous Ce 62 Y 19 Mn 19 would be originated from the substitution of Y for Ce.…”

Section: Resultsmentioning

confidence: 99%

“…It is difficult to remove the influence of Mn for the Ce concentration dependence of the specific heat and resistivity in amorphous Ce x Mn 100−x because the concentration of Mn besides Ce varies simultaneously with changing x. Therefore, the measurements of the specific heat and electrical resistivity in amorphous Ce x Y 80−x Mn 20 alloys, in which the amount of Mn is fixed and Ce concentration is diluted with nonmagnetic Y, have been performed in order to clarify the effect of Ce concentration on the dense Kondo state for the amorphous Ce x Mn 100−x alloys system [7]. From these results the Ce x Y 80−x Mn 20 alloys have been found to indicate the characteristic behavior of the heavy fermion in the Ce-rich region.…”

Section: Introductionmentioning

confidence: 99%

Heavy-fermion like behavior of amorphous Ce_xMn_100−xalloys system studied by⁵⁵Mn NMR

Niki

Okamura

Mahoe

et al. 2009

J. Phys.: Conf. Ser.

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“…The resistivity in the Ce-rich region depends on a T 2 law at low temperature with a very large coefficient A compared to the case of typical structural-disordered alloys with T 2 law. Very recently, we have investigated specific heat and resistivity on sputtered a-Ce x Y 80-x Mn 20 alloys with the substitution of non-magnetic Y for Ce [5]. The γ per Ce is very large and almost independent of the Ce-concentration (γ Ce ≈ 200 mJ/Ce-molK 2 ).…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of structure-disordered heavy fermion Ce-Mn alloys

Amakai

Murayama

Obi

et al. 2010

J. Phys.: Conf. Ser.

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La substitution effect to the heavy-fermion state in structure-disordered Ce-Ru alloys Y Amakai, D Yoshii, S Murayama et al. In the Ce-poor region of x ≤ 51, the low-temperature χ below 15 K exhibits a spin-glass transition. The spin-glass transition temperature T g decreases with increasing Ce-concentration. In the Ce-rich region of x ≥ 62, the spin-glass transition disappears and the CW paramagnetic behavior remains down to the low temperature limit. TheWeiss temperature θ is negative for all the samples and almost constant in the Ce-poor side. However, the absolute value of θ increases with increasing Ce-concentration in the Ce-rich region. We have interpreted this fact as an increase of the antiferromagnetic c-f coupling, namely the Kondo effect, with the Ce-concentration.

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Evidence of a heavy fermion state in the disordered Ce-alloy system without translation symmetry

Cited by 7 publications

References 26 publications

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Heavy-fermion like behavior of amorphous Ce_xMn_100−xalloys system studied by⁵⁵Mn NMR

Magnetic properties of structure-disordered heavy fermion Ce-Mn alloys

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Evidence of a heavy fermion state in the disordered Ce-alloy system without translation symmetry

Cited by 7 publications

References 26 publications

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Magnetotransport measurements of the surface states of samarium hexaboride using Corbino structures

Heavy-fermion like behavior of amorphous CexMn100−xalloys system studied by55Mn NMR

Magnetic properties of structure-disordered heavy fermion Ce-Mn alloys

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Product

Resources

About

Heavy-fermion like behavior of amorphous Ce_xMn_100−xalloys system studied by⁵⁵Mn NMR