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Magnetic ordering at anomalously high temperatures in selected lanthanides: what about Pr?
Jing Song1,2, James S Schilling1
1Department of Physics, Washington University, St. Louis, Missouri, 63130, United States of America.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 26, 2020
Summary
High pressure may induce a dense Kondo state in Pr metal, a material with a singlet ground state that normally suppresses magnetic order. This study investigated Pr
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Elemental neodymium, terbium, and dysprosium exhibit anomalous increases in magnetic ordering temperatures under sufficient pressure.
- Praseodymium (Pr) metal, with a dhcp structure and 4f2 configuration, has a singlet ground state that suppresses magnetic order to 50 mK, deviating from de Gennes scaling predictions of 15 K.
Purpose of the Study:
- To investigate the electrical resistivity of Pr metal under high pressure.
- To determine if pressure can induce magnetic order or other electronic states in Pr.
Main Methods:
- Four-point electrical resistivity measurements were performed on Pr samples.
- Measurements were conducted across a temperature range of 1.5–295 K.
- Pressures up to 48 GPa were applied.
Main Results:
- No clear evidence of magnetic order or superconductivity was observed above 1.5 K.
- The temperature dependence of resistivity suggests Pr may transition into a dense Kondo state.
- This potential transition appears to occur at pressures exceeding 10 GPa.
Conclusions:
- High pressure does not induce conventional magnetic order in Pr above 1.5 K.
- Evidence suggests Pr may enter a dense Kondo state under pressures greater than 10 GPa.
- This finding offers insights into the pressure-dependent electronic behavior of rare-earth elements.
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