Magnetic ordering in Co doped SrNi<sub>2</sub>P<sub>2</sub>.
ORAL
Abstract
SrNi2P2 is an intriguing system as it exhibits fully gapped superconductivity and adopts a unique third-collapsed tetragonal (tcT) phase[1,2]. It transitions from uncollapsed tetragonal (ucT) to tcT phase at Ts =< 326 K, where only one-third of P atoms bond across the Sr layer. Substituting Ni with Co completely suppresses Ts, drives sytem to ucT phase, and induces various magnetic ground states. The magnetic phase diagram of Sr(Ni1-xCox)2P2 obtained from the magnetization measurements shows that even though both stoichiometric SrNi2P2 and SrCo2P2 are paramagnetic, Sr(Ni1-xCox)2P2 are antiferromangetic for 0.58<≈x<≈0.94 and ferromagnetic for 0.95<≈x<≈0.98. Single-crystal neutron diffraction measurements performed on x = 0.88 sample confirms the long-range antiferromagnetic ordering with helical arrangement of spins along c-direction. Also, feature corresponding to ferromagnetic ordering was observed for x = 0.96. [1] F. Ronning et al PRB 79,134507(2009). [2] S. Xiao et al Nano Lett. 21,7913(2021).
*Work at Ames Laboratory was supported by the U.S. DOE, Office of BES, DMSE. Ames Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358. This research used resources at HFIR, a DOE Office of Science User Facility operated by the ORNL.
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Presenters
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Aashish Sapkota
- Ames Laboratory/Iowa State University
- Ames Laboratory