Complex magnetism in CeGe binary alloy

Marcano, N.; Espeso, J.I.; Sal, J.C. Gómez

doi:10.1016/j.jmmm.2006.10.328

Cited by 6 publications

(9 citation statements)

References 7 publications

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“…The application of pressure (a) can be seen to affect the resistivity in a number of ways: the residual resistivity is raised, the peak height above the curve is suppressed, and the Néel temperature is slightly enhanced. The effect of field is different [6] (b). The peak is suppressed and the residual resistivity is reduced.…”

Section: Resultsmentioning

confidence: 99%

Complex magnetic states of the heavy fermion compound CeGe

Haines

Marcano

Smith

et al. 2012

Low Temperature Physics

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The intermetallic compound CeGe exhibits unusual magnetic behavior due to the interplay between the Kondo and the antiferromagnetic coupling. This particular system is interesting because the Kondo temperature is close to the Néel temperature, resulting in a close competition between the low-temperature interactions, which can be tuned by means of varying external parameters such as pressure and applied magnetic field. Interestingly, magnetization measurements up to 12 kbar reveal that the Néel temperature is not affected by pressure. Measurements of the electrical resistivity, however, show that the sharp upturn appearing below T N is sensitive to pressures up to 15 kbar. This suggests that pressure may change the complex antiferromagnetic spin structure. The validity of an explanation based on the magnetic superzones seen in the rare earths is discussed here. PACS: 71.27.+a Strongly correlated electron systems; heavy fermions; 75.50.-y Studies of specific magnetic materials; 75.50.Ee Antiferromagnetics.

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Section: Resultsmentioning

confidence: 99%

Complex magnetic states of the heavy fermion compound CeGe

Haines

Marcano

Smith

et al. 2012

Low Temperature Physics

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“…This is interesting as [2] does not report any evidence of Kondo interaction in isostructural CeSi which has a lower unit cell volume compared to CeGe. Furthermore, Marcano et al [6] observed that in CeGe at T N , the electrical resistivity increased with decrease in the temperature indicating the signature of the magnetic superzone gap formation in this compound. Due to the relatively low crystal symmetry of CeGe, we felt that it was worthwhile to grow a single crystal of CeGe and explore its expected anisotropic magnetic behavior using the techniques of magnetization, heat capacity and electrical resistivity.…”

Section: Introductionmentioning

confidence: 92%

“…On the other hand, Noguchi et al [3] have grown a single crystal of CeSi and found that the ground state is a doublet with a magnetic easy axis along the [010] direction and a saturation moment of 1.75 µ B /Ce. Polycrystalline CeGe was also investigated, about four decades ago by Buschow [4] and very recently by Marcano et al [5,6], and found to order antiferromagnetically with a Néel temperature T N = 10.8 K. From heat capacity studies, Marcano et al [6] claimed that the Kondo interaction is present in CeGe. This is interesting as [2] does not report any evidence of Kondo interaction in isostructural CeSi which has a lower unit cell volume compared to CeGe.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic magnetic properties and superzone gap formation in CeGe single crystal

Das

Kumar

Kulkarni

et al. 2012

J. Phys.: Condens. Matter

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Single crystals of CeGe and its non-magnetic analog LaGe have been grown by the Czochralski method. The CeGe compound crystallizes in the orthorhombic FeB-type crystal structure with the space group Pnma (#62). The anisotropic magnetic properties have been investigated for well oriented single crystals by measuring the magnetic susceptibility, electrical resistivity and heat capacity. It has been found that CeGe orders antiferromagnetically at 10.5 K. Both transport and magnetic studies have revealed large anisotropy, reflecting the orthorhombic crystal structure. The magnetization data at 1.8 K reveal metamagnetic transitions along the [010] direction at 4.8 and 6.4 T and along the [100] direction at a critical field of 10.7 T, while the magnetization along the [001] direction increases linearly without any anomaly up to a field of 16 T. From the magnetic susceptibility and the magnetization measurements it has been found that the [010] direction is the easy axis of magnetization. The electrical resistivity along the three crystallographic directions exhibits an upturn at T(N), indicating superzone gap formation below T(N) in this compound. We have performed crystal electric field analysis on the magnetic susceptibility and the heat capacity data and found that the ground state is a doublet, and the energies of splitting from the ground state to the first and second excited doublet states were estimated to be 39 and 111 K, respectively.

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“…The former one is due to antiferromagnetic ordering while the later one arises due to some spin rearrangement [27]. The high magnetic field dependent studies of physical properties on CeGe revealed to the absence of signature of FL or NFL state [28][29][30][31], which is generally observed for other Ce-based compounds [7]. Hence, it would be of interest to investigate the physical properties of CeGe by dilution of Ce-site by a nonmagnetic ion, as there are no such literature reports about these investigations on this compound; to the best of our knowledge.…”

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Interplay between disorder-driven non-Fermi-liquid behavior and magnetism in the Ce_0.24La_0.76Ge compound

Singh¹,

Mukherjee²

2019

EPL

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In this work, we investigate the magnetic, heat capacity and electrical transport properties of Ce 0.6 La 0.4 Ge and Ce 0.24 La 0.76 Ge compounds. Our results show that two antiferromagnetic transitions (~ at 4.7 and 2.7 K) exhibited by Ce 0.6 La 0.4 Ge are suppressed below 1.8 K for Ce 0.24 La 0.76 Ge. Interestingly, for Ce 0.24 La 0.76 Ge, susceptibility, heat capacity and electrical resistivity vary with temperature as: T 0.75 , T 0.5 and T 1.6 respectively. The observation of such anomalous temperature variation suggests to the Non-Fermi-liquid (NFL) behavior due to the presence of disordered 4f spins due to Ce-site dilution. Under the application of magnetic field, it is noted that a crossover from the NFL to a magnetic state occurs around 2 Tesla, where, short-range correlations among the spins is prevalent due to the dominance of coupling between the magnetic moments via conduction electrons. Magnetoresistance scaling indicates that behavior of disorder driven NFL state is described by the dynamical mean field theory of the spin glass quantum critical point.Introduction: -In the area of research on 4f electron based compounds, a challenge which remains elusive is to understand the physical properties of materials where singular interaction is mediated by soft collective modes. This investigation is important as the obtained results violate the applicability of Fermi-liquid (FL) theory [1-2]. The FL theory forms a basis to understand the electronic properties and according to this theory, electrical resistivity (ρ) varies as the square of temperature (T) and the ratio of heat capacity (C) and temperature i.e. C/T is constant [3][4].However, it has been noted in many 4f electron based compounds that the FL theory breaks down and shows a Non-Fermi-Liquid (NFL) behavior near quantum critical point (QCP). The ρ of such compound shows a linear behavior with T while, T variation of C/T is logarithmic [5][6][7][8].The observation of such NFL behavior might arise due to the presence of soft order parameter fluctuations resulting in singular interactions mediated between electrons [9][10][11]. In some

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Complex magnetism in CeGe binary alloy

Cited by 6 publications

References 7 publications

Complex magnetic states of the heavy fermion compound CeGe

Complex magnetic states of the heavy fermion compound CeGe

Anisotropic magnetic properties and superzone gap formation in CeGe single crystal

Interplay between disorder-driven non-Fermi-liquid behavior and magnetism in the Ce_0.24La_0.76Ge compound

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Complex magnetism in CeGe binary alloy

Cited by 6 publications

References 7 publications

Complex magnetic states of the heavy fermion compound CeGe

Complex magnetic states of the heavy fermion compound CeGe

Anisotropic magnetic properties and superzone gap formation in CeGe single crystal

Interplay between disorder-driven non-Fermi-liquid behavior and magnetism in the Ce0.24La0.76Ge compound

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Interplay between disorder-driven non-Fermi-liquid behavior and magnetism in the Ce_0.24La_0.76Ge compound