Evidence for strong enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure [Anomalous enhancement of the magnetic ordering temperature of trivalent Nd metal under extreme pressure: Possible Kondo lattice behavior]
- Washington Univ., St. Louis, MO (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
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 ΔTc 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. Furthermore, the rise and fall of To and ΔTc with pressure can be accounted for in terms of an increase in the Kondo temperature.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); Consortium for Materials Properties Research in Earth Sciences (COMPRES)
- Grant/Contract Number:
- AC02-06CH11357; FC52-08NA28554
- OSTI ID:
- 1374149
- Alternate ID(s):
- OSTI ID: 1358645
- Journal Information:
- Physical Review B, Vol. 95, Issue 20; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
High-pressure structural systematics in samarium up to 222 GPa
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text | January 2020 |
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