Quantum critical spin-liquid-like behavior in the S= 12 quasikagome-lattice compound CeRh1-x PdxSn investigated using muon spin relaxation and neutron scattering

Rajesh Tripathi, D. T. Adroja, C. Ritter, Shivani Sharma, Chongli Yang, A. D. Hillier, M. M. Koza, F. Demmel, A. Sundaresan, S. Langridge, Wataru Higemoto, Takashi U. Ito, A. M. Strydom, G. B.G. Stenning, A. Bhattacharyya, David Keen, H. C. Walker, R. S. Perry, Francis Pratt, Qimiao SiT. Takabatake

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4 Citations (Scopus)

Abstract

We present the results of muon spin relaxation (μSR) and neutron scattering on the Ce-based quasikagome lattice CeRh1-xPdxSn (x=0.1 to 0.75). Our zero-field (ZF) μSR results reveal the absence of both static long-range magnetic order and spin freezing down to 0.05 K in the single-crystal sample of x=0.1. The weak temperature-dependent plateaus of the dynamic spin fluctuations below 0.2 K in ZF-μSR together with its longitudinal-field (LF) dependence between 0 and 3 kG indicate the presence of dynamic spin fluctuations persisting even at T=0.05K without static magnetic order. On the other hand, the magnetic specific heat divided by temperature C4f/T increases as -logT on cooling below 0.9 K, passes through a broad maximum at 0.13 K, and slightly decreases on further cooling. The ac susceptibility also exhibits a frequency-independent broad peak at 0.16 K, which is prominent with an applied field H along the c direction. We, therefore, argue that such a behavior for x=0.1 [namely, a plateau in spin relaxation rate (λ) below 0.2 K and a linear T dependence in C4f below 0.13 K] can be attributed to a metallic spin-liquid-like ground state near the quantum critical point in the frustrated Kondo lattice. The LF-μSR study suggests that the out of kagome plane spin fluctuations are responsible for the spin-liquid (SL) behavior. Low-energy inelastic neutron scattering (INS) of x=0.1 reveals gapless magnetic excitations, which are also supported by the behavior of C4f proportional to T1.1 down to 0.06 K. Our high-energy INS study shows very weak and broad scattering in x=0 and 0.1, which transforms into well-localized crystal-field excitations with increasing x. The ZF-μSR results for the x=0.2 polycrystalline sample exhibit similar behavior to that of x=0.1. A saturation of λ below 0.2 K suggests a spin-fluctuating SL ground state down to 0.05 K. The ZF-μSR results for the x=0.5 sample are interpreted as a long-range antiferromagnetic (AFM) ground state below TN=0.8K, in which the AFM interaction of the enlarged moments probably overcomes the frustration effect. The long-range AFM ordering is also supported by the evolution of magnetic Bragg peaks in x=0.75 sample observed below 5 K in the neutron diffraction data.

Original languageEnglish
Article number064436
JournalPhysical Review B
Volume106
Issue number6
DOIs
Publication statusPublished - 1 Aug 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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