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Unusual mixed spin-...
Unusual mixed spin-state of Co3+ in the ground state of LaSrCoO4: Combined high-pressure and high-temperature study
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- Haw, Shu Chih (author)
- National Synchrotron Radiation Research Center Taiwan
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- Hu, Zhiwei (author)
- Max Planck Institute for Chemical Physics of Solids
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- Lin, Hong Ji (author)
- National Synchrotron Radiation Research Center Taiwan
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- Lee, Jenn Min (author)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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- Ishii, Hirofumi (author)
- National Synchrotron Radiation Research Center Taiwan
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- Hiraoka, Nozomu (author)
- National Synchrotron Radiation Research Center Taiwan
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- Meléndez-sans, Anna (author)
- Max Planck Institute for Chemical Physics of Solids
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- Komarek, Alexander C. (author)
- Max Planck Institute for Chemical Physics of Solids
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- Tjeng, Liu Hao (author)
- Max Planck Institute for Chemical Physics of Solids
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- Chen, Kai (author)
- Helmholtz Association of German Research Centers
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- Luo, Chen (author)
- Helmholtz Association of German Research Centers
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- Radu, Florin (author)
- Helmholtz Association of German Research Centers
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- Te Chen, Chien (author)
- National Synchrotron Radiation Research Center Taiwan
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- Chen, Jin-ming (author)
- National Synchrotron Radiation Research Center Taiwan
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(creator_code:org_t)
- Elsevier BV, 2020
- 2020
- English.
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In: Journal of Alloys and Compounds. - : Elsevier BV. - 0925-8388.
- Related links:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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Abstract
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- The nature of the non-magnetic to paramagnetic transition of Co3+ oxide LaCoO3 was strongly disputed in the literature for many decades from a low-spin (LS) state below 20 K and to a mixed LS state and high-spin (HS) state or an intermediate-spin (IS) state above 100 K. In this context, the layered perovskite LaSrCoO4 is more favorable for a Jahn-Teller-active IS state because of an elongated distortion, but has been scarcely studied with experimental X-ray spectroscopies as a function of temperature or external pressure. Here, our Co-L2,3 X-ray absorption spectroscopic study indicates a mixture of 40% HS-Co3+ and 60% LS-Co3+ for LaSrCoO4 against 25% HS-Co3+ and 75% LS-Co3+ for LaCoO3 at 300 K and ambient pressure (AP). At 10 K, we observed a sizable magnetic-circular-dichroism signal and a clear HS state of the magnetic Co3+ ion from the Co-L2,3 edge of LaSrCoO4. This result demonstrates that the HS state is already populated in the ground state versus a pure LS ground state in LaCoO3. A quantitative change of quantum number of the spin of the Co3+ ion of LaSrCoO4 as a function of pressure and temperature investigated systematically with Co-Kβ X-ray emission experiments firmly demonstrates not only a mixed state of LS/HS at 300 K and AP but also a presence of the pure LS-Co3+ and HS-Co3+ states only under high pressure and high temperature, respectively.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Haw, Shu Chih
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Hu, Zhiwei
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Lin, Hong Ji
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Lee, Jenn Min
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Ishii, Hirofumi
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Hiraoka, Nozomu
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show more...
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Meléndez-sans, A ...
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Komarek, Alexand ...
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Tjeng, Liu Hao
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Chen, Kai
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Luo, Chen
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Radu, Florin
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Te Chen, Chien
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Chen, Jin-ming
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Subatomic Physic ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
- Articles in the publication
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Journal of Alloy ...
- By the university
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Lund University