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NMR/NQR Study of pressure-induced superconductor CePt$$_2$$In$$_7$$

Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Lee, H.*; Sidorov, V. A.*; Tobash, P. H.*; Ronning, F.*; Bauer, E. D.*; Thompson, J. D.*

Zero-field $$^{115}$$In-nuclear magnetic resonance (NMR) has been used to study single crystals of CePt$$_2$$In$$_7$$, a heavy-fermion antiferromagnet with a N$'e$el temperature ($$T_{rm N}$$) of 5.2 K at ambient pressure. The NMR spectra under zero field near the 3$$nu_{rm Q}$$ line of the orthorhombic In(3) sites are tracked by temperatures down to 1.6 K and by hydrostatic pressures up to 2.4 GPa. These data reveal the coexistence of commensurate (C) and incommensurate (IC) antiferromagneic orders at ambient pressure and that the C-AFM ordering is stabilized by increasing pressures where bulk superconductivity emerges. We will show the recent data of spectra and nuclear relaxation rates ($$1/T_1$$) under pressures.

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