Cascade of magnetic-field-driven quantum phase transitions in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Ce</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Pd</mml:mi><mml:mn>20</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Si</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>
نویسندگان
چکیده
Magnetically hidden order is a hypernym for electronic ordering phenomena that are visible to macroscopic thermodynamic probes but whose microscopic symmetry cannot be revealed with conventional neutron or x-ray diffraction. In handful of f-electron systems, the odd-rank multipoles leads parameters vanishing cross-section. Among them, Ce$_3$Pd$_{20}$Si$_6$ known its unique phase diagram exhibiting two distinct multipolar-ordered ground states (phases II and II'), separated by field-driven quantum transition associated putative change in ordered quadrupolar moment from $O_2^0$ $O_{xy}$. Using torque magnetometry at subkelvin temperatures, here we find another higher fields above 12 T, which appears only low-symmetry magnetic field directions $\mathbf{B} \parallel \langle11L\rangle$ $1 < L \leq 2$. While parameter this new II'' remains unknown, discovery renders material transitions between multipolar phases. They both clearly manifested magnetic-field dependence field-induced (111) Bragg intensities measured scattering [112]$. We also inelastic number nondegenerate collective excitations induced correlates phases same direction. Furthermore, excitation spectrum suggests may have different propagation vector, minimum dispersion represent Goldstone mode hidden-order phase.
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ژورنال
عنوان ژورنال: Physical review
سال: 2022
ISSN: ['0556-2813', '1538-4497', '1089-490X']
DOI: https://doi.org/10.1103/physrevb.105.174429