Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure
Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> is a heavy fermion compound near the quantum critical point (QCP). Its crystal structure may exhibit magnetic frustration due to a honeycomb arrangement; however, stacking faults in the crystal hinder structural analysis...
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2025-04-01
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| author | Yuji Matsumoto Yuki Watabe Fabio Iesari Masakatsu Osumi Kyugo Ota Yoshinori Haga Keisuke Hatada Toshihiro Okajima |
| author_facet | Yuji Matsumoto Yuki Watabe Fabio Iesari Masakatsu Osumi Kyugo Ota Yoshinori Haga Keisuke Hatada Toshihiro Okajima |
| author_sort | Yuji Matsumoto |
| collection | DOAJ |
| description | Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> is a heavy fermion compound near the quantum critical point (QCP). Its crystal structure may exhibit magnetic frustration due to a honeycomb arrangement; however, stacking faults in the crystal hinder structural analysis. As a local structure probe, extended X-ray absorption fine structure (EXAFS) is less sensitive to stacking faults and is a powerful tool for crystal structure determination. We synthesized single-crystal Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub>, performed single-crystal and powder X-ray diffraction experiments, and conducted X-ray absorption spectroscopy (XAS) measurements. The composition of Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> deviates from stoichiometry, suggesting Ce and Ga enrichment or Pt site deficiencies. A comparison of X-ray absorption near-edge structure (XANES) at the Ce L<sub>3</sub>-edge with reference materials suggests that Ce valence is likely trivalent. To determine the exact structure, we simultaneously analyzed EXAFS spectra at the Ce L<sub>3</sub>-, Pt L<sub>3</sub>-, and Ga K-edges. The EXAFS spectra of Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> are inconsistent with the hexagonal Sc<sub>0.6</sub>Fe<sub>2</sub>Si<sub>4.9</sub>-type structure but are better explained by an orthorhombic structure with a honeycomb arrangement. |
| format | Article |
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| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj-art-09812b3a08cd4cbeb2eeec039f5984302025-08-20T03:13:52ZengMDPI AGMetals2075-47012025-04-0115443610.3390/met15040436Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine StructureYuji Matsumoto0Yuki Watabe1Fabio Iesari2Masakatsu Osumi3Kyugo Ota4Yoshinori Haga5Keisuke Hatada6Toshihiro Okajima7Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, JapanGraduate School of Science and Engineering, University of Toyama, Toyama 930-8555, JapanAichi Synchrotron Radiation Center, Seto 489-0965, JapanGraduate School of Science and Engineering, University of Toyama, Toyama 930-8555, JapanGraduate School of Science and Engineering, University of Toyama, Toyama 930-8555, JapanAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, JapanGraduate School of Science and Engineering, University of Toyama, Toyama 930-8555, JapanAichi Synchrotron Radiation Center, Seto 489-0965, JapanCe<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> is a heavy fermion compound near the quantum critical point (QCP). Its crystal structure may exhibit magnetic frustration due to a honeycomb arrangement; however, stacking faults in the crystal hinder structural analysis. As a local structure probe, extended X-ray absorption fine structure (EXAFS) is less sensitive to stacking faults and is a powerful tool for crystal structure determination. We synthesized single-crystal Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub>, performed single-crystal and powder X-ray diffraction experiments, and conducted X-ray absorption spectroscopy (XAS) measurements. The composition of Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> deviates from stoichiometry, suggesting Ce and Ga enrichment or Pt site deficiencies. A comparison of X-ray absorption near-edge structure (XANES) at the Ce L<sub>3</sub>-edge with reference materials suggests that Ce valence is likely trivalent. To determine the exact structure, we simultaneously analyzed EXAFS spectra at the Ce L<sub>3</sub>-, Pt L<sub>3</sub>-, and Ga K-edges. The EXAFS spectra of Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> are inconsistent with the hexagonal Sc<sub>0.6</sub>Fe<sub>2</sub>Si<sub>4.9</sub>-type structure but are better explained by an orthorhombic structure with a honeycomb arrangement.https://www.mdpi.com/2075-4701/15/4/436single-crystal X-ray diffractionheavy fermionCe2Pt6Ga15XASXANESEXAFS |
| spellingShingle | Yuji Matsumoto Yuki Watabe Fabio Iesari Masakatsu Osumi Kyugo Ota Yoshinori Haga Keisuke Hatada Toshihiro Okajima Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure Metals single-crystal X-ray diffraction heavy fermion Ce2Pt6Ga15 XAS XANES EXAFS |
| title | Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure |
| title_full | Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure |
| title_fullStr | Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure |
| title_full_unstemmed | Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure |
| title_short | Local Structure Analysis of Heavy Fermion Ce<sub>2</sub>Pt<sub>6</sub>Ga<sub>15</sub> with a Honeycomb Structure Using Extended X-Ray Absorption Fine Structure |
| title_sort | local structure analysis of heavy fermion ce sub 2 sub pt sub 6 sub ga sub 15 sub with a honeycomb structure using extended x ray absorption fine structure |
| topic | single-crystal X-ray diffraction heavy fermion Ce2Pt6Ga15 XAS XANES EXAFS |
| url | https://www.mdpi.com/2075-4701/15/4/436 |
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