中国物理B ›› 2022, Vol. 31 ›› Issue (11): 117103-117103.doi: 10.1088/1674-1056/ac8345

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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. 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
  • 收稿日期:2022-06-24 修回日期:2022-07-20 接受日期:2022-07-22 出版日期:2022-10-17 发布日期:2022-10-21
  • 通讯作者: Peijie Sun E-mail:pjsun@iphy.ac.cn
  • 基金资助:
    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).

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. 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
  • Received:2022-06-24 Revised:2022-07-20 Accepted:2022-07-22 Online:2022-10-17 Published:2022-10-21
  • Contact: Peijie Sun E-mail:pjsun@iphy.ac.cn
  • Supported by:
    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).

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摘要： 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.

关键词: quantum phase transition, ultrasound, elastic constant, thermoelectric power

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.

Key words: quantum phase transition, ultrasound, elastic constant, thermoelectric power

中图分类号:  (Strongly correlated electron systems; heavy fermions)

  • 71.27.+a
73.43.Nq (Quantum phase transitions) 75.30.Mb (Valence fluctuation, Kondo lattice, and heavy-fermion phenomena)