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Title: de Haas–van Alphen study of role of 4 f electrons in antiferromagnetic CeZn 11 as compared to its nonmagnetic analog LaZn 11

Abstract

Here we present a de Haas–van Alphen study of the Fermi surface of the low-temperature antiferromagnet CeZn11 and its nonmagnetic analog LaZn11, measured by torque magnetometry up to fields of 33T and at temperatures down to 320 mK . Both systems possess similar de Haas–van Alphen frequencies, with three clear sets of features—ranging from 50 T to 4 kT —corresponding to three bands of a complex Fermi surface, with an expected fourth band also seen weakly in CeZn11 . The effective masses of the charge carriers are very light (<1 me) in LaZn11 but a factor of 2–4 larger in CeZn11, indicative of stronger electronic correlations. We perform detailed density functional theory (DFT) calculations for CeZn11 and find that only DFT+ U calculations with U = 1.5 eV , which localize the 4 f states, provide a good match to the measured de Haas–van Alphen frequencies, once the presence of magnetic breakdown orbits is also considered. Finally, our study suggests that the Fermi surface of CeZn11 is very close to that of LaZn11 being dominated by Zn 3d , as the Ce 4 f states are localized and have little influence on its electronic structure, however, they are responsible formore » its magnetic order and contribute to enhance electronic correlations.« less

Authors:
 [1];  [2];  [3];  [2];  [2];  [1]
  1. Univ. of Oxford (United Kingdom). Clarendon Lab., Dept. of Physics
  2. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  3. Radboud Univ., Nijmegen (Netherlands). High Field Magnet Laboratory (HFML-EMFL)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1342926
Alternate Identifier(s):
OSTI ID: 1334227
Report Number(s):
IS-J-9174
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1701182
Grant/Contract Number:  
EP/L001772/1; EP/I017836/1; EP/N01085X/1; EP/I004475/1; AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 23; 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

Citation Formats

Blake, S. F., Hodovanets, H., McCollam, A., Bud'ko, S. L., Canfield, P. C., and Coldea, A. I. de Haas–van Alphen study of role of 4f electrons in antiferromagnetic CeZn11 as compared to its nonmagnetic analog LaZn11. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.235103.
Blake, S. F., Hodovanets, H., McCollam, A., Bud'ko, S. L., Canfield, P. C., & Coldea, A. I. de Haas–van Alphen study of role of 4f electrons in antiferromagnetic CeZn11 as compared to its nonmagnetic analog LaZn11. United States. https://doi.org/10.1103/PhysRevB.94.235103
Blake, S. F., Hodovanets, H., McCollam, A., Bud'ko, S. L., Canfield, P. C., and Coldea, A. I. 2016. "de Haas–van Alphen study of role of 4f electrons in antiferromagnetic CeZn11 as compared to its nonmagnetic analog LaZn11". United States. https://doi.org/10.1103/PhysRevB.94.235103. https://www.osti.gov/servlets/purl/1342926.
@article{osti_1342926,
title = {de Haas–van Alphen study of role of 4f electrons in antiferromagnetic CeZn11 as compared to its nonmagnetic analog LaZn11},
author = {Blake, S. F. and Hodovanets, H. and McCollam, A. and Bud'ko, S. L. and Canfield, P. C. and Coldea, A. I.},
abstractNote = {Here we present a de Haas–van Alphen study of the Fermi surface of the low-temperature antiferromagnet CeZn11 and its nonmagnetic analog LaZn11, measured by torque magnetometry up to fields of 33T and at temperatures down to 320 mK . Both systems possess similar de Haas–van Alphen frequencies, with three clear sets of features—ranging from 50 T to 4 kT —corresponding to three bands of a complex Fermi surface, with an expected fourth band also seen weakly in CeZn11 . The effective masses of the charge carriers are very light (<1 me) in LaZn11 but a factor of 2–4 larger in CeZn11, indicative of stronger electronic correlations. We perform detailed density functional theory (DFT) calculations for CeZn11 and find that only DFT+ U calculations with U = 1.5 eV , which localize the 4 f states, provide a good match to the measured de Haas–van Alphen frequencies, once the presence of magnetic breakdown orbits is also considered. Finally, our study suggests that the Fermi surface of CeZn11 is very close to that of LaZn11 being dominated by Zn 3d , as the Ce 4 f states are localized and have little influence on its electronic structure, however, they are responsible for its magnetic order and contribute to enhance electronic correlations.},
doi = {10.1103/PhysRevB.94.235103},
url = {https://www.osti.gov/biblio/1342926}, journal = {Physical Review B},
issn = {2469-9950},
number = 23,
volume = 94,
place = {United States},
year = {Fri Dec 02 00:00:00 EST 2016},
month = {Fri Dec 02 00:00:00 EST 2016}
}

Journal Article:

Figures / Tables:

FIG. 1 FIG. 1: dHvA oscillations in CeZn11 and LaZn11. CeZn11: a) Field dependence of torque at 320 mK for angles between B ‖ [1 1 0] (0°) and B ‖ [1 0 0] (45°), alongside b) the temperature-field phase diagram at B ‖ [1 1 0] (white data points taken from12),more » c) the oscillatory component of torque and e) FFTs of the oscillatory component. LaZn11: d) Field dependence of torque at 2 K and f) FFTs of the oscillatory component for angles between B ‖ [1 1 0] (0°) and B ‖ [0 0 1] (90°). FFTs are performed over a wide field window of ∆B = 10 - 33 T to distinguish the low frequencies below F = 2 kT and a narrow high field window of ∆B = 20 - 33 T to amplify the high frequencies above separated by the vertical dashed line.« less

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