TY  - JOUR
AU  - Samartzis, A.
AU  - Xu, J.
AU  - Anand, V. K.
AU  - Islam, A. T. M. N.
AU  - Ollivier, J.
AU  - Su, Y.
AU  - Lake, B.
TI  - Pinch points and half-moons in dipolar-octupolar Nd2Hf2O7
JO  - Physical review / B
VL  - 106
IS  - 10
SN  - 1098-0121
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2022-03534
SP  - L100401
PY  - 2022
AB  - While it is established that the pinch point scattering pattern in spin ice arises from an emergent Coulomb phase associated with a magnetic moment that is divergence free, more complex Hamiltonians can introduce a divergence-full part. If these two parts remain decoupled, they give rise to the coexistence of distinct features. Here, we show that the moment in Nd2Hf2O7 forms a static long-range ordered ground state, a flat, gapped pinch point excitation, and dispersive excitations. These results confirm recent theories which predict that the dispersive modes, which arise from the divergence-full moment, host a pinch point pattern of their own, observed experimentally as “half-moons.”
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000858959100003
DO  - DOI:10.1103/PhysRevB.106.L100401
UR  - https://juser.fz-juelich.de/record/909940
ER  -