Quantum phase transitions in CePdAl probed by ultrasonic and thermoelectric measurements |
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Affiliation: | 1.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2.School of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China;3.Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract: | CePdAl has been recently recognized as a frustrated antiferromagnetic heavy-fermion compound with a pressure- or field-tuned, extended quantum critical phase at zero temperature. Identifying characteristic signatures of the emerging quantum critical phase, which are expected to be distinct from those near a quantum critical point, remains challenging. In this work, by performing ultrasonic and thermoelectric measurements down to very low temperatures in a 3He-4He dilution refrigerator in the presence of magnetic field, we are able to obtain some crucial thermodynamic and thermal transport features of the quantum critical phase, including a frustration-related elastic softening detected by ultrasound and a Fermi-surface change probed by thermoelectric effect. |
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Keywords: | quantum phase transition ultrasound elastic constant thermoelectric power |
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