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Title: Record high magnetic ordering temperature in a lanthanide at extreme pressure

Abstract

Today's best permanent magnet materials, SmCo 5 and Nd 2Fe 14B, could likely be made signi fi cantly more powerful were it not necessary to dilute the strong magnetism of the rare earth ions (Sm, Nd) with the 3 d transition elements (Fe, Co). Since the rare-earth metals order magnetically at relatively low temperatures T o <= 292 K, transition elements must be added to bring T o to temperatures well above ambient. Under pressure T o (P) for the neighboring lanthanides Gd, Tb, and Dy follows a notably nonmonotonic, but nearly identical, dependence to similar to 60 GPa. At higher pressures, however, Tb and Dy exhibit highly anomalous behavior, T o for Dy soaring to temperatures well above ambient. In conclusion, we suggest that this anomalously high magnetic ordering temperature is an heretofore unrecognized feature of the Kondo lattice state.

Authors:
 [1];  [2];  [3];  [4]
  1. Washington Univ., St. Louis, MO (United States); Washington State Univ., Pullman, WA (United States)
  2. Washington Univ., St. Louis, MO (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Washington Univ., St. Louis, MO (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
University of Chicago, Institute for Genomics and Systems Biology; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1419857
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physics. Conference Series
Additional Journal Information:
Journal Volume: 950; Journal ID: ISSN 1742-6588
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Lim, J., Fabbris, G., Haskel, D., and Schilling, J. S. Record high magnetic ordering temperature in a lanthanide at extreme pressure. United States: N. p., 2017. Web. doi:10.1088/1742-6596/950/4/042025.
Lim, J., Fabbris, G., Haskel, D., & Schilling, J. S. Record high magnetic ordering temperature in a lanthanide at extreme pressure. United States. doi:10.1088/1742-6596/950/4/042025.
Lim, J., Fabbris, G., Haskel, D., and Schilling, J. S. 2017. "Record high magnetic ordering temperature in a lanthanide at extreme pressure". United States. doi:10.1088/1742-6596/950/4/042025. https://www.osti.gov/servlets/purl/1419857.
@article{osti_1419857,
title = {Record high magnetic ordering temperature in a lanthanide at extreme pressure},
author = {Lim, J. and Fabbris, G. and Haskel, D. and Schilling, J. S.},
abstractNote = {Today's best permanent magnet materials, SmCo5 and Nd2Fe14B, could likely be made signi fi cantly more powerful were it not necessary to dilute the strong magnetism of the rare earth ions (Sm, Nd) with the 3 d transition elements (Fe, Co). Since the rare-earth metals order magnetically at relatively low temperatures T o <= 292 K, transition elements must be added to bring T o to temperatures well above ambient. Under pressure T o (P) for the neighboring lanthanides Gd, Tb, and Dy follows a notably nonmonotonic, but nearly identical, dependence to similar to 60 GPa. At higher pressures, however, Tb and Dy exhibit highly anomalous behavior, T o for Dy soaring to temperatures well above ambient. In conclusion, we suggest that this anomalously high magnetic ordering temperature is an heretofore unrecognized feature of the Kondo lattice state.},
doi = {10.1088/1742-6596/950/4/042025},
journal = {Journal of Physics. Conference Series},
number = ,
volume = 950,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
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  • Four-point electrical resistivity measurements were carried out on Nd metal and dilute magnetic alloys containing up to 1 at.% Nd in superconducting Y for temperatures 1.5–295 K under pressures to 210 GPa. The magnetic ordering temperature T o of Nd appears to rise steeply under pressure, increasing ninefold to 180 K at 70 GPa before falling rapidly. Y(Nd) alloys display both a resistivity minimum and superconducting pair breaking ΔT c as large as 38 K/at.% Nd. The present results give evidence that for pressures above 30–40 GPa, the exchange coupling J between Nd ions and conduction electrons becomes negative, thusmore » activating Kondo physics in this highly correlated electron system. Furthermore, the rise and fall of T o and ΔT c with pressure can be accounted for in terms of an increase in the Kondo temperature.« less
  • Cited by 3
  • In an attempt to destabilize the magnetic state of the heavy lanthanide Dy, extreme pressures were applied in an electrical resistivity measurement to 157 GPa over the temperature range 1.3 - 295 K. The magnetic ordering temperature T o and spin-disorder resistance R sd of Dy, as well as the superconducting pair-breaking effect ΔT c in Y(1 at.% Dy), are found to track each other in a highly non-monotonic fashion as a function of pressure. Above 73 GPa, the critical pressure for a 6% volume collapse in Dy, all three quantities increase sharply (dT o=dP≃5.3 K/GPa), T o appearing tomore » rise above ambient temperature for P > 107 GPa. In contrast, T o and ΔT c for Gd and Y(0.5 at.% Gd), respectively, show no such sharp increase with pressure (dT o=dP≃ 0.73 K/GPa). Altogether, these results suggest that extreme pressure transports Dy into an unconventional magnetic state with an anomalously high magnetic ordering temperature.« less
  • In an attempt to destabilize the magnetic state of the heavy lanthanide Dy, extreme pressures were applied in an electrical resistivity measurement to 157 GPa over the temperature range 1.3-295 K. The magnetic ordering temperature T-o and spin-disorder resistance R-sd of Dy, as well as the superconducting pair-breaking effect Delta T-c in Y(1 at.% Dy), are found to track each other in a highly nonmonotonic fashion as a function of pressure. Above 73 GPa, the critical pressure for a 6% volume collapse in Dy, all three quantities increase sharply (dT(o)/dP similar or equal to 5.3 K/GPa), T-o appearing to risemore » above ambient temperature for P > 107 GPa. In contrast, To and Delta T-c for Gd and Y(0.5 at.% Gd), respectively, show no such sharp increase with pressure (dT(o)/dP similar or equal to 0.73K/GPa). Taken together, these results suggest that extreme pressure transports Dy into an unconventional magnetic state with an anomalously high magnetic ordering temperature.« less