Landau theory of Multipolar order in PrTM2(Al,Zn)20

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A series of Pr(TM)2X20 (with TM = Ti, V, Rh, Ir and X = Al, Zn) Kondo materials, containing non-Kramers Pr3+4f2 moments on a diamond lattice, have been shown to exhibit intertwined orders such as quadrupolar order and superconductivity. Motivated by these experiments, we propose and study a Landau theory of multipolar order to capture the phase diagram and its field dependence. In zero magnetic field, we show that different quadrupolar states, or the coexistence of quadrupolar and octupolar orderings, may lead to ground states with multiple broken symmetries. Upon heating, such states may undergo two-step thermal transitions into the symmetric paramagnetic phase, with partial restoration of broken symmetries in the intervening phase. For nonzero magnetic field, we show the evolution of these thermal phase transitions strongly depends on the field direction, due to clock anisotropy terms in the free energy. Our findings shed substantial light on experimental results in the Pr(TM)2Al20 materials. We propose further experimental tests to distinguish purely quadrupolar orders from coexisting quadrupolar-octupolar orders.
Publisher
America Physical Society
Issue Date
2018-03-07
Language
English
Citation

APS March Meeting

URI
http://hdl.handle.net/10203/272904
Appears in Collection
PH-Conference Papers(학술회의논문)
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