CeAu2Bi: A new nonsymmorphic antiferromagnetic compound

FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL E NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOHere, we report the structural and electronic properties of CeAu2Bi, a new heavy-fermion compound crystallizing in a nonsymmorphic hexagonal structure (P63/mmc). The Ce3+ ions form a triangular lattice which orders antiferromagnetically below T-N = 3.1 K with a magnetic hard axis along the c axis. Under applied pressure, T-N increases linearly at a rate of 0.07 K/kbar, indicating that the Ce f electrons are fairly localized. In fact, heat capacity measurements provide an estimate of 150(10) mJ/mol K-2 for the Sommerfeld coefficient. The crystal-field scheme obtained from our thermodynamic data points to a ground state with a dominantly vertical bar j(z) = +/- 1/2 gt; character, which commonly occurs in systems with a hard c axis. Finally, electronic band structure calculations and symmetry analysis in k space reveal that CeAu2Bi hosts symmetry-protected crossings at k(z) = pi in the paramagnetic state.3716FAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL E NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCAPES - COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL E NÍVEL SUPERIORCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO2015/15665-32017/10581-12017/25269-3Sem informaçãoSem informaçãoWe would like to acknowledge N. Harrison and M. Rahn for useful discussions. Sample synthesis and crystal structure determination were supported by the DOE BES "Science of 100 Tesla" project. Physical property measurements and band structure calculations were supported by the DOE BES "Quantum Fluctuations in Narrow-Band Systems" project. M. M. P. acknowledges support from the Sao Paulo Research Foundation (FAPESP) Grants No. 2015/15665-3, No. 2017/25269-3, and No. 2017/10581-1, CAPES and CNPq, Brazil. W. Z. thanks the startup funding from Westlake University. Scanning electron microscope and energy dispersive xray measurements were performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science