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Title: High-resolution x-ray diffraction study of the heavy-fermion compound YbBiPt

Authors:
; ; ; ; ; ;  [1]
  1. Iowa State
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCESNSF
OSTI Identifier:
1236274
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 92; Journal Issue: (18) ; 11, 2015
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Ueland, B. G., Saunders, S. M., Bud’ko, S. L., Schmiedeshoff, G. M., Canfield, P. C., Kreyssig, A., and Goldman, A. I. High-resolution x-ray diffraction study of the heavy-fermion compound YbBiPt. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.92.184111.
Ueland, B. G., Saunders, S. M., Bud’ko, S. L., Schmiedeshoff, G. M., Canfield, P. C., Kreyssig, A., & Goldman, A. I. High-resolution x-ray diffraction study of the heavy-fermion compound YbBiPt. United States. doi:10.1103/PhysRevB.92.184111.
Ueland, B. G., Saunders, S. M., Bud’ko, S. L., Schmiedeshoff, G. M., Canfield, P. C., Kreyssig, A., and Goldman, A. I. 2016. "High-resolution x-ray diffraction study of the heavy-fermion compound YbBiPt". United States. doi:10.1103/PhysRevB.92.184111.
@article{osti_1236274,
title = {High-resolution x-ray diffraction study of the heavy-fermion compound YbBiPt},
author = {Ueland, B. G. and Saunders, S. M. and Bud’ko, S. L. and Schmiedeshoff, G. M. and Canfield, P. C. and Kreyssig, A. and Goldman, A. I.},
abstractNote = {},
doi = {10.1103/PhysRevB.92.184111},
journal = {Physical Review B},
number = (18) ; 11, 2015,
volume = 92,
place = {United States},
year = 2016,
month = 6
}
  • Cited by 1
  • In this study, YbBiPt is a heavy-fermion compound possessing significant short-range antiferromagnetic correlations below a temperature of T*=0.7K, fragile antiferromagnetic order below T N = 0.4K, a Kondo temperature of T K ≈ 1K, and crystalline-electric-field splitting on the order of E/k B = 1 – 10K. Whereas the compound has a face-centered-cubic lattice at ambient temperature, certain experimental data, particularly those from studies aimed at determining its crystalline-electric-field scheme, suggest that the lattice distorts at lower temperature. Here, we present results from high-resolution, high-energy x-ray diffraction experiments which show that, within our experimental resolution of ≈ 6 – 10more » × 10 –5 Å, no structural phase transition occurs between T = 1.5 and 50 K. In combination with results from dilatometry measurements, we further show that the compound's thermal expansion has a minimum at ≈ 18 K and a region of negative thermal expansion for 9 ≲ T ≲ 18 K. Despite diffraction patterns taken at 1.6 K which indicate that the lattice is face-centered cubic and that the Yb resides on a crystallographic site with cubic point symmetry, we demonstrate that the linear thermal expansion may be modeled using crystalline-electric-field level schemes appropriate for Yb 3+ residing on a site with either cubic or less than cubic point symmetry.« less
  • We report results from neutron scattering experiments on single crystals of YbBiPt that demonstrate antiferromagnetic order characterized by a propagation vector, τAFM = (121212), and ordered moments that align along the [1 1 1] direction of the cubic unit cell. We describe the scattering in terms of a two-Gaussian peak fit, which consists of a narrower component that appears below TN≈0.4 K and corresponds to a magnetic correlation length of ξn≈ 80 Å, and a broad component that persists up to T*≈ 0.7 K and corresponds to antiferromagnetic correlations extending over ξb≈ 20 Å. Our results illustrate the fragile magneticmore » order present in YbBiPt and provide a path forward for microscopic investigations of the ground states and fluctuations associated with the purported quantum critical point in this heavy-fermion compound.« less
  • We report resistivity measurements on the cubic heavy-fermion compound YbBiPt at ambient and hydrostatic pressures to [approx]6 kbar and in magnetic fields to 1 T. Resistivity anisotropy sets in below the phase-transition temperature [ital T][sub [ital c]]=0.4 K. We interpret a rise of resistivity below 0.4 K as due to partial gapping of the Fermi surface with the weak coupling energy gap of [Delta][sub 0]/[ital k][sub [ital B]][ital T][sub [ital c]]=1.65[plus minus]0.15. Effects of hydrostatic pressure and magnetic field on the phase transition and heat capacity data are consistent with a spin density wave formation in a very heavy electronmore » band at [ital T]=0.4 K.« less
  • The super-heavy-fermion compound YbBiPt has the largest known linear specific-heat coefficient [gamma]=8 J mol[sup [minus]1] K[sup [minus]2], and the source of this enormous electronic'' specific heat is of great current interest. Here we describe neutron-diffraction studies that indicate its previously reported crystallographic structure to be incorrect. We find that the Pt atom is on the unique site and can be thought of as an interstitial in a fictitious rock-salt structure YbBi, which can in turn be thought of as an ordered form of elemental bismuth. We find no evidence of disorder between sites, occupancy on the nominally vacant site, normore » for any tetragonal or rhombohedral distortions or displacements. Furthermore, any ordered magnetic moment at low temperature must be less than 0.25[mu][sub [ital B]]. The sample contains 8.1 wt. % elemental Bi, and if this is typical of other samples, the previously published values for molar susceptibilities and specific heats should be scaled up by this amount to obtain the intrinsic properties of YbBiPt alone.« less