Journal
NPJ QUANTUM MATERIALS
Volume 4, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41535-019-0148-1
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Funding
- National Institute for Materials Science (NIMS)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation
- Canada Research Chair (Tier II) program
- Canadian Institute for Advanced Research
- National Science Foundation [NSFDMR-1350002]
- Engineering and Physical Sciences Research Council [EP/K014331/1, EP/J00099X/1, EP/P021786/1] Funding Source: researchfish
- EPSRC [EP/K014331/1, EP/P021786/1, EP/J00099X/1] Funding Source: UKRI
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Transition metal oxides of the 4d and 5d block have recently become the targets of materials discovery, largely due to their strong spin-orbit coupling that can generate exotic magnetic and electronic states. Here, we report the high-pressure synthesis of Lu2Rh2O7, a new cubic pyrochlore oxide based on 4d(5) Rh4+, and characterizations via thermodynamic, electrical transport, and muon spin relaxation measurements. Magnetic susceptibility measurements reveal a large temperature-independent Pauli paramagnetic contribution, while heat capacity shows an enhanced Sommerfeld coefficient, gamma = 21.8(1) mJ/mol-Rh K-2. Muon spin relaxation measurements confirm that Lu2Rh2O7\ remains paramagnetic down to 2 K. Taken in combination, these three measurements suggest that Lu2Rh2O7 is a correlated paramagnetic metal with a Wilson ratio of R-W = 2.5. However, electric transport measurements present a striking contradiction as the resistivity of Lu2Rh2O7 is observed to monotonically increase with decreasing temperature, indicative of a nonmetallic state. Furthermore, although the magnitude of the resistivity is that of a semiconductor, the temperature dependence does not obey any conventional form. Thus, we propose that Lu2Rh2O7 may belong to the same novel class of non-Fermi liquids as the nonmetallic metal FeCrAs.
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