Nature CommunicationsProbing hidden symmetry via nonlinear transport in an altermagnet candidate Ca3Ru2O7Subin MaliYufei ZhaoYu WangSaugata SarkerYangyang ChenZixuan LiJun ZhuYing LiuVenkatraman GopalanBinghai YanZhiqiang Mao2026-02-23Full textDOI https://doi.org/10.1038/s41467-026-69739-9