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Title: Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure

Abstract

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 To 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 Delta T-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, thus activating Kondo physics in this highly correlated electron system. The rise and fall of T-o and Delta T-c with pressure can be accounted for in terms of an increase in the Kondo temperature.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); Carnegie/DOE Alliance Center (CDAC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1433007
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Song, J., Bi, W., Haskel, D., and Schilling, J. S. Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.205138.
Song, J., Bi, W., Haskel, D., & Schilling, J. S. Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure. United States. doi:10.1103/PhysRevB.95.205138.
Song, J., Bi, W., Haskel, D., and Schilling, J. S. Mon . "Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure". United States. doi:10.1103/PhysRevB.95.205138.
@article{osti_1433007,
title = {Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure},
author = {Song, J. and Bi, W. and Haskel, D. and Schilling, J. S.},
abstractNote = {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 To 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 Delta T-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, thus activating Kondo physics in this highly correlated electron system. The rise and fall of T-o and Delta T-c with pressure can be accounted for in terms of an increase in the Kondo temperature.},
doi = {10.1103/PhysRevB.95.205138},
journal = {Physical Review B},
issn = {2469-9950},
number = 20,
volume = 95,
place = {United States},
year = {2017},
month = {5}
}

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