Probing Hidden Order (HO) in the YbPd2In ground state through neutron powder diffraction
The issue of Hidden Order (HO) is one of the most intriguing in solid state physics and it refers to materials where a clear phase transition occurs but the nature of the order parameter is unknown. The prototype compound for HO is URu2Si2, which shows a puzzling transition at ~ 17 K. In particular, neutron diffraction analyses evidenced an AFM order in the HO state, with an ordered-moment (~0.02 mB) too small to account for the observed macroscopic behavior. Despite decades of intensive research, no consensus yet emerged regarding the microscopic nature of the HO. In the search of new intermetallic compounds showing similar properties, the recently synthesized compound YbPd2In fulfills these characteristics showing a notably similar Bcr/Tcr ratio between the critical field (Bcr), at which the ordered phase is suppressed, and the temperature (Tcr) of the transition at B=0. The low Bcr ~0.8T and the corresponding low Tcr ~ 250mK values of YbPd2In offer the opportunity to get rid of spurious effects originated in the high values of Br ~ 34T and Tcr ~ 17K of URu2Si2. Neutron diffraction analysis represents a fundamental technique to shed light on the intrinsic nature of the HO state.
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ESPESO Jose I.; L Fernandez Barquin; GIOVANNINI Mauro; GOMEZ SAL Jose Carlos; MARTINELLI Alberto; RITTER Clemens and RODRIGUEZ FERNANDEZ Jesus. (2021). Probing Hidden Order (HO) in the YbPd2In ground state through neutron powder diffraction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2776
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