Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks

Kihara T, Nojiri H, Narumi Y, Oshima Y, Kindo K, Heesing C, Schnack J, Müller A (2019)
PHYSICAL REVIEW B 99(6): 064430.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Abstract / Bemerkung
Magnetization, specific heat, and electron spin resonance (ESR) measurements are carried out to clarify the low-energy excitations for the S = 1/2 polyhedral clusters {Mo72V30} and {W72V30}. The clusters provide unique model systems of a kagome network on a quasisphere. The linear field variation of magnetization at low temperatures indicates that the ground state is singlet for both clusters. The temperature and the magnetic field dependence of specific heat shows a distinct difference between the two clusters with differing structural symmetries. In {W72V30} with I-h symmetry, the existence of several tens of low-energy singlet excited states below the lowest triplet excited state is revealed. The specific heat of the slightly distorted {Mo72V30} with D-5h symmetry leads to a drastic decrease of the singlet contribution, which is consistent with the partial lifting of the frustration and the decrease of degenerated low-energy states. The singlet excitation existence is confirmed further by the temperature dependence of the ESR spectra. Comprehensive experimental studies have demonstrated unique low-energy excitations of the spherical kagome networks and their sensitivity to the cluster symmetry.
Erscheinungsjahr
2019
Zeitschriftentitel
PHYSICAL REVIEW B
Band
99
Ausgabe
6
Art.-Nr.
064430
ISSN
2469-9950
eISSN
2469-9969
Page URI
https://pub.uni-bielefeld.de/record/2934379

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Kihara T, Nojiri H, Narumi Y, et al. Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks. PHYSICAL REVIEW B. 2019;99(6): 064430.
Kihara, T., Nojiri, H., Narumi, Y., Oshima, Y., Kindo, K., Heesing, C., Schnack, J., et al. (2019). Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks. PHYSICAL REVIEW B, 99(6), 064430. doi:10.1103/PhysRevB.99.064430
Kihara, T., Nojiri, H., Narumi, Y., Oshima, Y., Kindo, K., Heesing, C., Schnack, J., and Müller, A. (2019). Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks. PHYSICAL REVIEW B 99:064430.
Kihara, T., et al., 2019. Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks. PHYSICAL REVIEW B, 99(6): 064430.
T. Kihara, et al., “Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks”, PHYSICAL REVIEW B, vol. 99, 2019, : 064430.
Kihara, T., Nojiri, H., Narumi, Y., Oshima, Y., Kindo, K., Heesing, C., Schnack, J., Müller, A.: Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks. PHYSICAL REVIEW B. 99, : 064430 (2019).
Kihara, T., Nojiri, H., Narumi, Y., Oshima, Y., Kindo, K., Heesing, C., Schnack, Jürgen, and Müller, Achim. “Evidence of low-energy singlet excited states in the spin-1/2 polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks”. PHYSICAL REVIEW B 99.6 (2019): 064430.