1
|
Gui X, Chang TR, Wei K, Daum MJ, Graf DE, Baumbach RE, Mourigal M, Xie W. A Novel Magnetic Material by Design: Observation of Yb 3+ with Spin-1/2 in Yb x Pt 5P. ACS CENTRAL SCIENCE 2020; 6:2023-2030. [PMID: 33274279 PMCID: PMC7706091 DOI: 10.1021/acscentsci.0c00691] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Indexed: 06/12/2023]
Abstract
The localized f-electrons enrich the magnetic properties in rare-earth-based intermetallics. Among those, compounds with heavier 4d and 5d transition metals are even more fascinating because anomalous electronic properties may be induced by the hybridization of 4f and itinerant conduction electrons primarily from the d orbitals. Here, we describe the observation of trivalent Yb3+ with S = 1/2 at low temperatures in Yb x Pt5P, the first of a new family of materials. Yb x Pt5P (0.23 ≤ x ≤ 0.96) phases were synthesized and structurally characterized. They exhibit a large homogeneity width with the Yb ratio exclusively occupying the 1a site in the anti-CeCoIn5 structure. Moreover, a sudden resistivity drop could be found in Yb x Pt5P below ∼0.6 K, which requires further investigation. First-principles electronic structure calculations substantiate the antiferromagnetic ground state and indicate that two-dimensional nesting around the Fermi level may give rise to exotic physical properties, such as superconductivity. Yb x Pt5P appears to be a unique case among materials.
Collapse
Affiliation(s)
- Xin Gui
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Tay-Rong Chang
- Department
of Physics, National Cheng Kung University, Tainan, Taiwan 70101
- Center
for Quantum Frontiers of Research & Technology (QFort), Tainan, Taiwan 70101
| | - Kaya Wei
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32306, United States
| | - Marcus J. Daum
- School
of Physics, Georgia Institute of Technology, Atlanta, Georgia 30322, United States
| | - David E. Graf
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32306, United States
| | - Ryan E. Baumbach
- National
High Magnetic Field Laboratory, Tallahassee, Florida 32306, United States
- Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Martin Mourigal
- School
of Physics, Georgia Institute of Technology, Atlanta, Georgia 30322, United States
| | - Weiwei Xie
- Department
of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| |
Collapse
|
2
|
Martino E, Arakcheeva A, Autès G, Pisoni A, Bachmann MD, Modic KA, Helm T, Yazyev OV, Moll PJW, Forró L, Katrych S. Sr 2Pt 8-x As: a layered incommensurately modulated metal with saturated resistivity. IUCRJ 2018; 5:470-477. [PMID: 30002847 PMCID: PMC6038961 DOI: 10.1107/s2052252518007303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 05/15/2018] [Indexed: 06/08/2023]
Abstract
The high-pressure synthesis and incommensurately modulated structure are reported for the new compound Sr2Pt8-x As, with x = 0.715 (5). The structure consists of Sr2Pt3As layers alternating with Pt-only corrugated grids. Ab initio calculations predict a metallic character with a dominant role of the Pt d electrons. The electrical resistivity (ρ) and Seebeck coefficient confirm the metallic character, but surprisingly, ρ showed a near-flat temperature dependence. This observation fits the description of the Mooij correlation for electrical resistivity in disordered metals, originally developed for statistically distributed point defects. The discussed material has a long-range crystallographic order, but the high concentration of Pt vacancies, incommensurately ordered, strongly influences the electronic conduction properties. This result extends the range of validity of the Mooij correlation to long-range ordered incommensurately modulated vacancies. Motivated by the layered structure, the resistivity anisotropy was measured in a focused-ion-beam micro-fabricated well oriented single crystal. A low resistivity anisotropy indicates that the layers are electrically coupled and conduction channels along different directions are intermixed.
Collapse
Affiliation(s)
- Edoardo Martino
- Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
- Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Alla Arakcheeva
- Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Gabriel Autès
- National Centre for Computational Design and Discovery of Novel Materials MARVEL, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Andrea Pisoni
- Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Maja D. Bachmann
- Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Kimberly A. Modic
- Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Toni Helm
- Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - Oleg V. Yazyev
- National Centre for Computational Design and Discovery of Novel Materials MARVEL, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Philip J. W. Moll
- Max-Planck-Institute for Chemical Physics of Solids, Dresden 01187, Germany
| | - László Forró
- Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Sergiy Katrych
- Laboratory of Physics of Complex Matter, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| |
Collapse
|