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The properties of the heavy fermion compound Ce 3 PtIn 11 are rather enigmatic. Not only the
compound possesses two inequivalent Ce-sites but at ambient pressure it exhibits two
successive antiferromagnetic (AFM) transitions at T 1 = 2.2K and T N = 2K, respectively [1].
Upon further cooling superconductivity is found with T c = 0.32K. Entropy analysis
conjectured the idea that the Ce2-ions are responsible for the magnetic ordering whereas the
second Ce1-ions evokes superconductivity. Here we present our recent 115 In NMR/NQR and
specific heat results. From these we infer that Ce 3 PtIn 11 possibly harbors two quantum critical
points (QCP) i.e., zero temperature phase transtitions – one close to/or at ambient pressure [2]
and one to be reached by an applied hydrostatic pressure of p c = 1.5GPa [1]. Each QCP can be
associated with a particular Ce-site. The critical magnetic fluctuations accompanying the
QCPs are at the origin of Cooper-pairing.
*This work was supported by the Czech Science Foundation (GAČR) Grant No. 18-23606S,
the EU COST Action CA16218 and by the Czech Ministry of Education under the COST
project scheme, project No. LTC18024.
[1] J. Prokleška et al., Phys. Rev. B 92, 161114(R) (2015).
[2] S. Kambe et al., Phys. Rev B. 101, 081103(R) (2020).
