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Title: Experimental observation of magnetic dimers in diluted Yb:YAlO3

Abstract

In this paper, we present a comprehensive experimental investigation of Yb magnetic dimers in Yb0.04Y0.96AlO3, an Yb-doped yttrium aluminum perovskite YAlO3, by means of specific heat, magnetization, and high-resolution inelastic neutron scattering (INS) measurements. In our sample, the Yb ions are randomly distributed over the lattice and ~7% of Yb ions form quantum dimers due to nearest-neighbor antiferromagnetic coupling along the c axis. At zero field, the dimer formation manifests itself in an appearance of an inelastic peak at Δ ≈ 0.2 meV in the INS spectrum and a Schottky-like anomaly in the specific heat. The structure factor of the INS peak exhibits a cosine modulation along the $L$ direction, in agreement with the $c$-axis nearest-neighbor intradimer coupling. A careful fitting of the low-temperature specific heat shows that the excited state is a degenerate triplet, which indicates a surprisingly small anisotropy of the effective Yb-Yb exchange interaction despite the low crystal symmetry and anisotropic magnetic dipole contribution, in agreement with previous reports for the Yb parent compound, YbAlO3, and in contrast to Yb2Pt2Pb. The obtained results are precisely reproduced by analytical calculations for the Yb dimers.

Authors:
 [1];  [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany); Technische Univ. Dresden (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1633028
Alternate Identifier(s):
OSTI ID: 1649265
Report Number(s):
BNL-216005-2020-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
SC0012704; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 24; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Nikitin, S. E., Xie, Tao, Podlesnyak, A., and Zaliznyak, Igor A. Experimental observation of magnetic dimers in diluted Yb:YAlO3. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevB.101.245150.
Nikitin, S. E., Xie, Tao, Podlesnyak, A., & Zaliznyak, Igor A. Experimental observation of magnetic dimers in diluted Yb:YAlO3. United States. https://doi.org/10.1103/PhysRevB.101.245150
Nikitin, S. E., Xie, Tao, Podlesnyak, A., and Zaliznyak, Igor A. Fri . "Experimental observation of magnetic dimers in diluted Yb:YAlO3". United States. https://doi.org/10.1103/PhysRevB.101.245150. https://www.osti.gov/servlets/purl/1633028.
@article{osti_1633028,
title = {Experimental observation of magnetic dimers in diluted Yb:YAlO3},
author = {Nikitin, S. E. and Xie, Tao and Podlesnyak, A. and Zaliznyak, Igor A.},
abstractNote = {In this paper, we present a comprehensive experimental investigation of Yb magnetic dimers in Yb0.04Y0.96AlO3, an Yb-doped yttrium aluminum perovskite YAlO3, by means of specific heat, magnetization, and high-resolution inelastic neutron scattering (INS) measurements. In our sample, the Yb ions are randomly distributed over the lattice and ~7% of Yb ions form quantum dimers due to nearest-neighbor antiferromagnetic coupling along the c axis. At zero field, the dimer formation manifests itself in an appearance of an inelastic peak at Δ ≈ 0.2 meV in the INS spectrum and a Schottky-like anomaly in the specific heat. The structure factor of the INS peak exhibits a cosine modulation along the $L$ direction, in agreement with the $c$-axis nearest-neighbor intradimer coupling. A careful fitting of the low-temperature specific heat shows that the excited state is a degenerate triplet, which indicates a surprisingly small anisotropy of the effective Yb-Yb exchange interaction despite the low crystal symmetry and anisotropic magnetic dipole contribution, in agreement with previous reports for the Yb parent compound, YbAlO3, and in contrast to Yb2Pt2Pb. The obtained results are precisely reproduced by analytical calculations for the Yb dimers.},
doi = {10.1103/PhysRevB.101.245150},
journal = {Physical Review B},
number = 24,
volume = 101,
place = {United States},
year = {2020},
month = {6}
}

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