NMR/NQR Study of pressure-induced superconductor CePtIn

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

Zero-field In-nuclear magnetic resonance (NMR) has been used to study single crystals of CePtIn, a heavy-fermion antiferromagnet with a Nel temperature () of 5.2 K at ambient pressure. The NMR spectra under zero field near the 3 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 () under pressures.