Abstract
We report a chemical substitution-induced ferromagnetic quantum critical point in polycrystalline Ni1-xRhx alloys. Through magnetization and muon spin relaxation measurements, we show that the ferromagnetic ordering temperature is suppressed continuously to zero at xcrit=0.375 while the magnetic volume fraction remains 100% up to xcrit, pointing to a second order transition. Non-Fermi liquid behavior is observed close to xcrit, where the electronic specific heat Cel/T diverges logarithmically, while immediately above xcrit the volume thermal expansion coefficient αV/T and the Grüneisen ratio Γ=αV/Cel both diverge logarithmically in the low temperature limit, further indication of a ferromagnetic quantum critical point in Ni1-xRhx.
| Original language | English |
|---|---|
| Article number | 117203 |
| Journal | Physical Review Letters |
| Volume | 124 |
| Issue number | 11 |
| DOIs | |
| State | Published - Mar 20 2020 |
Funding
We acknowledge V. Taufour, D.-N. Cho, and D. Belitz for fruitful discussions. The work at Rice University was funded by the NSF DMR 1903741. We thank G. Costin for his assistance with EPMA measurements. The use of the EPMA facility at the Department of Earth, Environmental and Planetary Sciences, Rice University, is kindly acknowledged. We are grateful to Bassam Hitti and Gerald Morris for their assistance with the muon spin relaxation measurements. Research at McMaster University is supported by the Natural Sciences and Engineering Research Council of Canada. T.\u2009B. and T.\u2009S. are supported by Grant No. DE-SC0008832 from the Materials Sciences and Engineering Division in the U.S. Department of Energy\u2019s Office of Basic Energy Sciences and the National High Magnetic Field Laboratory through the NSF Cooperative Agreement No. DMR-1157490 and the State of Florida.