| Download | - View accepted manuscript: Coexistence of singlet and ordered S=1/2 moments in the ground state of the triclinic quantum magnet CuMoO4 (PDF, 1.4 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevB.84.094436 |
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| Author | Search for: Haravifard, S.; Search for: Fritsch, K.; Search for: Asano, T.; Search for: Clancy, J. P.; Search for: Yamani, Z.1; Search for: Ehlers, G.; Search for: Nishimura, T.; Search for: Inagaki, Y.; Search for: Kawae, T.; Search for: Swainson, I.1; Search for: Gaulin, B. D. |
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| Affiliation | - National Research Council of Canada. NRC Canadian Neutron Beam Centre
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| Format | Text, Article |
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| Abstract | 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. |
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| Publication date | 2011-09-22 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 18702524 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 1e757895-4d2b-4bcf-9f72-4565cb489f13 |
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| Record created | 2011-11-10 |
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| Record modified | 2020-04-21 |
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