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‣ Paramagnetic Meissner Effect in Superconducting Single Crystals of Ba_{1-x}K_xBiO_3
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Português
Relevância na Pesquisa
171.29668%
The paramagnetic Meissner effect (PME) in the field cooled susceptibility has
been observed in superconducting single crystals of Ba_{1-x}K_xBiO_3 using
magnetometers of Quantum-Design Co.. The PME is similar to that observed in
cuprates and Nb superconductors. For the Ba_{0.63}K_{0.37}BiO_3 crystal, the
PME is observed in cooling process under the field up to 750 Oe. The PME was
not found in the virgin-charged superconducting magnet. The PME is found in a
superconductor with trapped flux and may arise from a remnant field, a
temperature inhomogeneity near T_c, and a potassium-concentration
inhomogeneity.; Comment: 4 pages, 4 figures
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‣ Piezomagnetic effect as a counterpart of negative thermal expansion in magnetically frustrated Mn-based antiperovskite nitrides
Fonte: Universidade Cornell
Publicador: Universidade Cornell
Tipo: Artigo de Revista Científica
Publicado em 10/12/2015
Português
Relevância na Pesquisa
171.29668%
The interplay of magnetic and elastic properties due to geometrical
frustration in antiferromagnetic Mn-aniperovskite nitrides manifests itself in
a range of phenomena such as the barocaloric (BCE), piezomagnetic (PME),
magnetovolume effect (MVE), and the related negative thermal expansion (NTE).
This systematic computational study uses density functional theory across a
wide range of cubic antiperovskites Mn$_3$AN (A = Rh, Pd, Ag, Co, Ni, Zn, Ga,
In, Sn) in order to account for variations in the magnetic frustration based on
features of the electronic structure. It focuses on PME - the linear dependence
of magnetisation on applied biaxial strain. The PME in Mn$_3$SnN predicted here
is an order of magnitude larger than PME modelled so far in
Mn$_3$GaN,\cite{lukashev2008theory} which opens the way to composite
magnetoelectric effect in piezomagnetic/piezoelectric heterostructures.
Moreover, the simulated PME as a zero temperature property is shown to be
inversely proportional to the measured spontaneous volume expansion at a phase
transition from paramagnetic (PM) to antiferromagnetic (AFM)
state.\cite{takenaka2014magnetovolume} On the fundamental level, such relation
implies a significant suppression of spin fluctuations by the strong
frustration in these systems. At the same time it can be used as a tool in
search for materials with large negative thermal expansion and barocaloric
effect.; Comment: 8 pages...
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