A Metallic -wave magnet with commensurate spin helix

Yamada, Rinsuke*; Birch, M. T.*; Baral, P. R.*; Okumura, Shun*; Nakano, Ryota*; Gao, S.*; Ezawa, Motohiko*; Nomoto, Takuya*; Masell, J.*; Ishihara, Yuki*; Kolincio, K. K.*; Belpolski, I.*; Sagayama, Hajime*; Nakao, Hironori*; Oishi, Kazuki*; Ohara, Takashi   ; Kiyanagi, Ryoji  ; Nakajima, Taro*; Tokura, Yoshinori*; Arima, Takahisa*; Motome, Yukitoshi*; Hirschmann, M. M.*; Hirschberger, M.*

Antiferromagnetic states with spin-split electronic structure give rise to novel spintronic, magnonic, and electronic phenomena despite (near-) zero net magnetization. The simplest odd-parity spin splitting, -wave, was originally proposed to emerge from a collective instability in interacting electron systems. Recent theory identifies a distinct route to realise -wave spin-split electronic bands without strong correlations, termed p-wave magnetism. Here we demonstrate an experimental realisation of a metallic -wave magnet.