摘要
CePdAl has been recently recognized as a frustrated antiferromagnetic heavy-fermion compound with a pressureor 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^(3)He–^(4)He 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.
作者
Hengcan Zhao
Meng Lyu
Jiahao Zhang
Shuai Zhang
Peijie Sun
赵恒灿;吕孟;张佳浩;张帅;孙培杰(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Science,University of Chinese Academy of Sciences,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)
基金
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)
by China Postdoctoral Science Foundation(Grant No.2020TQ0349)。
