Naslov
NMR study of "pinwheel" kagome Rb2Cu3SnF12

Autori
Grbić, Mihael Srđan ; Krämer, Steffen ; Horvatić, Mladen ; Berthier, Claude ; Tanaka, Hidekazu

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Dynamics and transport in quantum magnets

Mjesto i datum
Ljubljana, Slovenija, 04.06.2012. - 06.06.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
kagome; nmr; valence bond solid

Sažetak
Using (63, 65)Cu nuclear magnetic resonance (NMR) in magnetic fields up to 30 T we study the microscopic properties of the 12-site valence-bond-solid ground state in the "pinwheel" kagome compound Rb2Cu3SnF12. We find that the ground state is characterized by a strong transverse staggered spin polarization whose temperature and field dependence points to a mixing of the singlet and triplet states. This is further corroborated by the field dependence of the gap \Delta (H), which has a level anticrossing with a large minimum gap value of \Delta(0), with no evidence of a phase transition down to 1.5 K. By the exact diagonalization of small clusters, we show that the observed anticrossing is mainly due to staggered tilts of the g-tensors defined by the crystal structure, and reveal symmetry properties of the low-energy excitation spectrum compatible with the absence of level crossing.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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