Chemical pressure in SmNiC2−xBxcompounds: evidence of a quantum critical behavior

Morales, F.; Mendivil, L. F.; Escamilla, R.

doi:10.1088/0953-8984/26/45/455602

Cited by 4 publications

(4 citation statements)

References 25 publications

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“…The difference between them is likely associated with a weakening of the AFM interactions and an increase of spin disorder. This behavior differs from the results obtained for Sm 1−x La x NiC 2 41 , and SmNiC 2−x B x 40 , where weak doping initially causes a slight increase of Curie temperature T C followed by more abrupt suppression of FM for higher doping rates.…”

Section: Resultscontrasting

confidence: 99%

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Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds

et al. 2019

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The path from the charge density wave antiferromagnet NdNiC2 to a noncentrosymmetric superconductor LaNiC2 has been studied by gradual replacement of Nd by La ions. The evolution of physical properties has been explored by structural, magnetic, transport, magnetoresistance and specific heat measurements. With the substitution of La for Nd, the Peierls temperature is gradually suppressed, which falls within the BCS mean-field relation for chemical pressure with a critical concentration of xc = 0.38. As long as charge density wave is maintained, the antiferromagnetic ground state remains robust against doping and despite of a Nel temperature reduction shows a rapid and sharp magnetic transition. Once the CDW is completely suppressed, intermediate compounds of the Nd1−xLaxNiC2 series reveal symptoms of a gradual softening of the features associated with AFM transition and increase of the spin disorder. Immediately after the antiferromagnetic transition is depressed to zero temperature, the further incorporation of La ions results in the emergence of superconductivity. This crossover in the Nd1−xLaxNiC2 is discussed in the terms of the possible quantum critical point.

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Section: Resultscontrasting

confidence: 99%

“…The blue color represents the region in which CDW is observed with the Peierls temperature gradually suppressed from T CDW = 121 K for NdNiC 2 with increasing of the La concentration. T CDW (x) is succesfuly described by mean-field power law function characterizing the influence of chem-ical pressure 40,64,65 :…”

Section: Fig 4 A)mentioning

confidence: 99%

Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds

et al. 2019

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“…Recently B-doped SmNiC 2 reported a similar increase in T C from 17.5 K to 23.1 K until the CDW is present32. Once a CDW is suppressed in Sm 1−x La x NiC 2 , however, the Curie temperature starts to decrease and is suppressed down to 2.5 K at x = 0.86.…”

Section: Discussionmentioning

confidence: 77%

Tuning the ferromagnetic phase in the CDW compound SmNiC2 via chemical alloying

Prathiba

Kim

Shin

et al. 2016

Sci Rep

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We report a study on tuning the charge density wave (CDW) ferromagnet SmNiC2 to a weakly coupled superconductor by substituting La for Sm. X-ray diffraction measurements show that the doped compounds obey Vegard’s law, where La (Lu) alloying expands (shrinks) the lattice due to its larger (smaller) atomic size than Sm. In the series Sm1−xLaxNiC2, CDW transition (TCDW = 148 K) for SmNiC2 is gradually suppressed, while the ferromagnetic (FM) ordering temperature (TC) at 17 K slightly increases up to x = 0.3. For x > 0.3, TC starts to decrease and there is no signature that could be related with the CDW phase. Electrical resistivity, magnetic susceptibility and specific heat measurements point toward the possible presence of a FM quantum critical point (QCP) near x = 0.92, where the TC is extrapolated to zero temperature. Superconductivity in LaNiC2 (Tsc = 2.9 K) is completely suppressed with small amount of Sm inclusion near the proposed FM critical point, indicating a competition between the two ordered phases. The tunable lattice parameters via chemical substitution (La,Lu) and the ensuing change among the ordered phases of ferromagnetism, CDW and superconductivity underscores that SmNiC2 provides a rich avenue to study the rare example of a FM QCP, where the broken symmetries are intricately correlated.

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“…The family of NC carbides RNiC 2 (where R is a rareearth element) is studied intensively. The many nontrivial phenomena have been observed in them, such as quantum critical behavior, interplay of charge density wave (CDW), magnetism, and unconventional superconductivity [30][31][32][33][34][35][36][37][38]. The compounds with R = Nd, Tb, Dy, Ho, Er, and Tm order antiferromagnetically at low temperatures [39,40].…”

Section: Introductionmentioning

confidence: 99%

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

et al. 2021

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We present studies of neutron diffraction, electrical resistivity, magnetic susceptibility, magnetization, and specific heat of noncentrosymmetric YbNiC 2 . At normal pressure, YbNiC 2 is a moderate heavy-fermion compound with Kondo lattice. At 16 K we observe an anomaly in the temperature dependence of specific heat which is ascribed to an abrupt valence change of Yb ions. At pressures above 7 GPa, the valence change and the Kondo lattice state are suppressed, and near a temperature of 10 K we detect the appearance of magnetic order. Above 5 GPa, the temperature dependence of the resistivity behaves similarly to other compounds of the CeNiC 2 -type family, indicating the formation of charge density waves. This is attributed to the nesting properties of the Fermi surface (FS) found within the density functional theory + dynamical mean field theory treatment. Our ab initio calculations also show that the valence of Yb in YbNiC 2 at normal conditions is 2.85, which increases with temperature and pressure. The FS of YbNiC 2 is anisotropic in shape in comparison with the 3D surface of YbCoC 2 .

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Chemical pressure in SmNiC_2−xB_xcompounds: evidence of a quantum critical behavior

Cited by 4 publications

References 25 publications

Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds

Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds

Tuning the ferromagnetic phase in the CDW compound SmNiC2 via chemical alloying

Pressure influence on the valence and magnetic state of Yb ions in noncentrosymmetric heavy-fermion YbNiC2

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