| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Quantum phase transitions in CePdAl probed by ultrasonic and thermoelectric measurements |
| Hengcan Zhao(赵恒灿)1, Meng Lyu(吕孟)1, Jiahao Zhang(张佳浩)1, Shuai Zhang(张帅)1, and Peijie Sun(孙培杰)1,2,3,† |
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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Received: 24 June 2022
Revised: 20 July 2022
Accepted manuscript online: 22 July 2022
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PACS:
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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73.43.Nq
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(Quantum phase transitions)
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75.30.Mb
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(Valence fluctuation, Kondo lattice, and heavy-fermion phenomena)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0303100), the National Natural Science Foundation of China (Grant Nos. 12141002, 52088101, and 11974389), the Fund of the Chinese Academy of Sciences through the Scientific Instrument Developing Project (Grant No. ZDKYYQ20210003), the Strategic Priority Research Program (Grant No. XDB33000000), and by China Postdoctoral Science Foundation (Grant No. 2020TQ0349). |
Corresponding Authors:
Peijie Sun
E-mail: pjsun@iphy.ac.cn
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Cite this article:
Hengcan Zhao(赵恒灿), Meng Lyu(吕孟), Jiahao Zhang(张佳浩), Shuai Zhang(张帅), and Peijie Sun(孙培杰) Quantum phase transitions in CePdAl probed by ultrasonic and thermoelectric measurements 2022 Chin. Phys. B 31 117103
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