Stuart Calder

Oct 2, 2024 | nature.com | Ningning Wang |Jun Luo |Yunqing Shi |Zhian Ren |Ziyi Liu |Yue Liu | +8 more

AbstractThe Ruddlesden–Popper (R–P) bilayer nickelate, La3Ni2O7, was recently found to show signatures of high-temperature superconductivity (HTSC) at pressures above 14 GPa (ref. 1). Subsequent investigations achieved zero resistance in single-crystalline and polycrystalline samples under hydrostatic pressure conditions2,3,4. Yet, obvious diamagnetic signals, the other hallmark of superconductors, are still lacking owing to the filamentary nature with low superconducting volume fraction2,4,5.

Aug 22, 2024 | nature.com | Pyeongjae Park |Andrew May |Andrey Podlesnyak |Stuart Calder |Joseph A. M. Paddison |Cristian D. Batista | +4 more

AbstractThe S = 1/2 triangular lattice antiferromagnet (TLAF) is a paradigmatic example of frustrated quantum magnetism. An ongoing challenge involves understanding the influence of exchange anisotropy on the collective behavior within such systems. Using inelastic neutron scattering (INS) and advanced calculation techniques, we have studied the low and high-temperature spin dynamics of Ba2La2CoTe2O12 (BLCTO): a Co2+-based Jeff = 1/2 TLAF that exhibits 120° order below TN = 3.26 K.