Phototunable Magnetism in Copper Octacyanomolybdate
We introduce copper molybdenum cyanides of general formula Cu2[Mo(CN)8]·nH2O, which can serve as optofunctional magnetic devices. Their ground states generally stay paramagnetic down to temperatures of the K order but exhibit a spontaneous magnetization upon photoirradiation usually below a few tens...
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/762765 |
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| author | Jun Ohara Shoji Yamamoto |
| author_facet | Jun Ohara Shoji Yamamoto |
| author_sort | Jun Ohara |
| collection | DOAJ |
| description | We introduce copper molybdenum cyanides of general formula Cu2[Mo(CN)8]·nH2O, which can serve as optofunctional magnetic devices. Their ground states generally stay paramagnetic down to temperatures of the K order but exhibit a spontaneous magnetization upon photoirradiation usually below a few tens of K. To interest us still further, such a ferromagnetic stateinduced by blue-laser irradiation is demagnetized step by step through further application of red or near-infrared laser pulses. We solve this intriguing photomagnetism. The ground-state properties are fully revealed by means of a group-theoretical technique. Taking account of experimental observations, we simulate applying pump laser pulses to a likely ground state and successfully reproduce both the magnetization and demagnetization dynamics. We monitor the photorelaxation process through angle-resolved photoemission spectroscopy. Electrons are fully itinerant in any of the photoinduced steady states, forming a striking contrast to the initial equilibrium state of atomic aspect. The fully demagnetized final steady state looks completely different from the initial paramagnetism but bears good analogy to one of the possible ground states available with the Coulomb repulsion on Cu sites suppressed. |
| format | Article |
| id | doaj-art-7fc02e19d0d5463ab6fe40167cc47c29 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-7fc02e19d0d5463ab6fe40167cc47c292025-02-03T05:44:47ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/762765762765Phototunable Magnetism in Copper OctacyanomolybdateJun Ohara0Shoji Yamamoto1Department of Physics, Hokkaido University, Sapporo 060-0810, JapanDepartment of Physics, Hokkaido University, Sapporo 060-0810, JapanWe introduce copper molybdenum cyanides of general formula Cu2[Mo(CN)8]·nH2O, which can serve as optofunctional magnetic devices. Their ground states generally stay paramagnetic down to temperatures of the K order but exhibit a spontaneous magnetization upon photoirradiation usually below a few tens of K. To interest us still further, such a ferromagnetic stateinduced by blue-laser irradiation is demagnetized step by step through further application of red or near-infrared laser pulses. We solve this intriguing photomagnetism. The ground-state properties are fully revealed by means of a group-theoretical technique. Taking account of experimental observations, we simulate applying pump laser pulses to a likely ground state and successfully reproduce both the magnetization and demagnetization dynamics. We monitor the photorelaxation process through angle-resolved photoemission spectroscopy. Electrons are fully itinerant in any of the photoinduced steady states, forming a striking contrast to the initial equilibrium state of atomic aspect. The fully demagnetized final steady state looks completely different from the initial paramagnetism but bears good analogy to one of the possible ground states available with the Coulomb repulsion on Cu sites suppressed.http://dx.doi.org/10.1155/2014/762765 |
| spellingShingle | Jun Ohara Shoji Yamamoto Phototunable Magnetism in Copper Octacyanomolybdate The Scientific World Journal |
| title | Phototunable Magnetism in Copper Octacyanomolybdate |
| title_full | Phototunable Magnetism in Copper Octacyanomolybdate |
| title_fullStr | Phototunable Magnetism in Copper Octacyanomolybdate |
| title_full_unstemmed | Phototunable Magnetism in Copper Octacyanomolybdate |
| title_short | Phototunable Magnetism in Copper Octacyanomolybdate |
| title_sort | phototunable magnetism in copper octacyanomolybdate |
| url | http://dx.doi.org/10.1155/2014/762765 |
| work_keys_str_mv | AT junohara phototunablemagnetismincopperoctacyanomolybdate AT shojiyamamoto phototunablemagnetismincopperoctacyanomolybdate |