Quantum Griffiths phase in the kagome Kondo lattice CeRh$_{0.9}$Pd$_{0.1}$Sn
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916958719442944 |
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| author | Tang, Nan Tripathi, Rajesh Shimura, Yasuyuki Takabatake, Toshiro Adroja, Devashibhai A. Gegenwart, Philipp |
| author_facet | Tang, Nan Tripathi, Rajesh Shimura, Yasuyuki Takabatake, Toshiro Adroja, Devashibhai A. Gegenwart, Philipp |
| contents | CeRhSn is a valence fluctuating heavy-fermion metal with a twisted Ce-kagome lattice, displaying zero-field quantum criticality, previously associated with geometrical frustration. The partial substitution of Rh by Pd in CeRh$_{1-x}$Pd$_x$Sn enlarges the unit-cell volume, suppresses valence fluctuations, decreases the Kondo temperature and stabilizes a possible long-range antiferromagnetic (AFM) ordered ground state with $T_N=0.8$ K at $x=0.5$. Previous thermodynamic and spectroscopic measurements for $x=0.1$ suggested a quantum critical spin liquid. We report low-temperature dilatometry and magnetization measurements on CeRh$_{0.9}$Pd$_{0.1}$Sn and compare with published low-$T$ specific heat data. The absence of a Grüneisen parameter divergence excludes a conventional quantum criticality scenario. Instead, the weak power-law divergences signal non-Fermi liquid (NFL) behavior, according to a disorder-driven quantum Griffiths phase scenario. At low temperatures, a negative thermal expansion is found in fields above approximately 0.5 T and the NFL scaling breaks down, probably due to the polarization of AFM correlations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_18422 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantum Griffiths phase in the kagome Kondo lattice CeRh$_{0.9}$Pd$_{0.1}$Sn Tang, Nan Tripathi, Rajesh Shimura, Yasuyuki Takabatake, Toshiro Adroja, Devashibhai A. Gegenwart, Philipp Strongly Correlated Electrons CeRhSn is a valence fluctuating heavy-fermion metal with a twisted Ce-kagome lattice, displaying zero-field quantum criticality, previously associated with geometrical frustration. The partial substitution of Rh by Pd in CeRh$_{1-x}$Pd$_x$Sn enlarges the unit-cell volume, suppresses valence fluctuations, decreases the Kondo temperature and stabilizes a possible long-range antiferromagnetic (AFM) ordered ground state with $T_N=0.8$ K at $x=0.5$. Previous thermodynamic and spectroscopic measurements for $x=0.1$ suggested a quantum critical spin liquid. We report low-temperature dilatometry and magnetization measurements on CeRh$_{0.9}$Pd$_{0.1}$Sn and compare with published low-$T$ specific heat data. The absence of a Grüneisen parameter divergence excludes a conventional quantum criticality scenario. Instead, the weak power-law divergences signal non-Fermi liquid (NFL) behavior, according to a disorder-driven quantum Griffiths phase scenario. At low temperatures, a negative thermal expansion is found in fields above approximately 0.5 T and the NFL scaling breaks down, probably due to the polarization of AFM correlations. |
| title | Quantum Griffiths phase in the kagome Kondo lattice CeRh$_{0.9}$Pd$_{0.1}$Sn |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2507.18422 |