Téléchargement | - Voir le manuscrit accepté : Coexistence of singlet and ordered S=1/2 moments in the ground state of the triclinic quantum magnet CuMoO4 (PDF, 1.4 Mio)
|
---|
DOI | Trouver le DOI : https://doi.org/10.1103/PhysRevB.84.094436 |
---|
Auteur | Rechercher : Haravifard, S.; Rechercher : Fritsch, K.; Rechercher : Asano, T.; Rechercher : Clancy, J. P.; Rechercher : Yamani, Z.1; Rechercher : Ehlers, G.; Rechercher : Nishimura, T.; Rechercher : Inagaki, Y.; Rechercher : Kawae, T.; Rechercher : Swainson, I.1; Rechercher : Gaulin, B. D. |
---|
Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
|
---|
Format | Texte, Article |
---|
Résumé | CuMoO4 is a triclinic quantum magnet based on S=1/2 moments at the Cu2+ site. It has recently attracted interest due to the remarkable changes in its chromic and volumetric properties at high temperatures and in its magnetic properties at low temperatures. This material exhibits a first-order structural phase transition at TC ∼ 190 K as well as a magnetic phase transition at TN ∼ 1.75 K. We report low-temperature heat capacity measurements as well as extensive elastic and inelastic neutron scattering measurements on powder samples taken above and below TN. We observe neutron diffraction consistent with a simple (1/2, 0, 0) antiferromagnetic structure indicating a doubling of the a-axis periodicity below TN. In addition, inelastic neutron scattering above a spin gap of ∼2.3 meV is consistent with triplet excitations out of paired S=1/2 moments which form singlet dimers. Low-lying spin wave excitations are also observed and these originate from ordered S=1/2 moments below TN. Taken together these measurements show the ground state of CuMoO4 to display both nonmagnetic singlets and ferromagnetically coupled spins coexisting within an antiferromagnetic structure below TN ∼ 1.75 K. |
---|
Date de publication | 2011-09-22 |
---|
Dans | |
---|
Langue | anglais |
---|
Publications évaluées par des pairs | Oui |
---|
Numéro NPARC | 18702524 |
---|
Exporter la notice | Exporter en format RIS |
---|
Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
---|
Identificateur de l’enregistrement | 1e757895-4d2b-4bcf-9f72-4565cb489f13 |
---|
Enregistrement créé | 2011-11-10 |
---|
Enregistrement modifié | 2020-04-21 |
---|