Electronic band structure and structural stability of LaBiPt

Oguchi, Tamio

doi:10.1103/physrevb.63.125115

Cited by 46 publications

(37 citation statements)

References 24 publications

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“…The band calculations for LaPtBi [31] and CePtBi [19], assuming localized 4f states, were found to be semimetals. In these calculations, two hole-like Fermi surface sheets are found around zone center, which are similar to the measured angular dependence of the Fermi surface cross-section area of LaPtBi.…”

Section: Discussionmentioning

confidence: 94%

Quantum oscillations in the heavy-fermion compound YbPtBi

et al. 2015

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We present quantum oscillations observed in the heavy fermion compound YbPtBi in magnetic fields far beyond its field-tuned, quantum critical point. Quantum oscillations are observed in magnetic fields as low as 60 kOe at 60 mK and up to temperatures as high as 3 K, which confirms the very high quality of the samples as well as the small effective mass of conduction carriers far from the quantum critical point. Although the electronic specific heat coefficient of YbPtBi reaches ∼ 7.4 J/mol K 2 in zero field, which is one of the highest effective mass value among heavy fermion systems, it is suppressed quickly by applied magnetic field. The quantum oscillations were used to extract the quasiparticle effective masses of the order of the bare electron mass, which is consistent with the behavior observed in specific heat measurements. Such a small effective masses at high fields can be understood by considering the suppression of Kondo screening.

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Section: Discussionmentioning

confidence: 94%

Quantum oscillations in the heavy-fermion compound YbPtBi

et al. 2015

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“…Figure 5a shows results of X-ray diffraction measurements that give the pressure dependence of a-and c-axis lengths; the lattice parameters decrease smoothly with increasing pressure to P = 4 GPa, without any signature of a structural transition. From these data, we calculate the EFG using the first-principles Hiroshima Linear-Augmented-Plane-Wave (HiLAPW) codes 40 . As expected, the calculated ν HiLAPW Q increases monotonically with applied pressure (Fig.…”

Section: Resultsmentioning

confidence: 99%

Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5

Kawasaki

Sorime

et al. 2020

Commun Phys

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A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (P)-dependent 115 In nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh 0.5 Ir 0.5 In 5. These experiments reveal an antiferromagnetic (AF) QCP at P AF c ¼ 1:2 GPa where a dome of superconductivity reaches a maximum transition temperature T c. Preceding P AF c , however, the NQR frequency ν Q undergoes an abrupt increase at P Ã c = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium's f-electron and associated small-to-large change in the Fermi surface. At P AF c where T c is optimized, there is an unusually large fraction of gapless excitations well below T c that implicates spin-singlet, odd-frequency pairing symmetry.

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“…The full relativistic band calculations including spinorbit coupling (SOC) were performed with the allelectron full-potential linear augmented plane wave (FLAPW) method implemented in HiLAPW 16 . Details of numerical procedures were described in the previous work 16 . Polycrystalline samples of LaPt 2−x Ge 2+x were synthesized by melting the elements of La (99.9 %), Pt (99.999 %), and Ge (99.999 %) in an arc furnace under high purity (99.9999 %) Ar atmosphere.…”

Section: Methodsmentioning

confidence: 99%

Superconductivity and the electronic phase diagram ofLaPt2−xGe2+x

et al. 2015

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In many cases, unconventional superconductivity are realized by suppressing another order parameter, such as charge density wave (CDW) or spin density wave (SDW). This suggests that the fluctuations of these order parameters play an important role in producing superconductivity. LaPt2Ge2 undergoes a tetragonal-to-monoclinic structural phase transition (SPT) at Ts = 394 K, accompanying a double period modulation in the a-axis direction, and superconducts at Tc = 0.41 K. We performed band calculations and found 2D (two dimensional)-like Fermi surfaces with partial nesting. A reduction in the density of states in the monoclinic phase was found in the calculation and confirmed by 195 Pt-NMR. We suggest a CDW as a possible cause for the SPT. By changing the stoichiometry between Pt and Ge, we succeeded in suppressing Ts and increasing Tc in LaPt2−xGe2+x. Comparison of 139 La-and 195 Pt-NMR data reveals moderate fluctuations associated with SPT. From 139 La-NQR measurements at zero field, we found that an isotropic superconducting gap is realized in LaPt2−xGe2+x (x = 0.20). We discuss the relationship between superconductivity and the SPT order/fluctuations.

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Electronic band structure and structural stability of LaBiPt

Cited by 46 publications

References 24 publications

Quantum oscillations in the heavy-fermion compound YbPtBi

Quantum oscillations in the heavy-fermion compound YbPtBi

Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5

Superconductivity and the electronic phase diagram ofLaPt2−xGe2+x

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