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Harter JW, Kennes DM, Chu H, de la Torre A, Zhao ZY, Yan JQ, Mandrus DG, Millis AJ, Hsieh D. Evidence of an Improper Displacive Phase Transition in Cd_{2}Re_{2}O_{7} via Time-Resolved Coherent Phonon Spectroscopy. PHYSICAL REVIEW LETTERS 2018; 120:047601. [PMID: 29437453 DOI: 10.1103/physrevlett.120.047601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Indexed: 06/08/2023]
Abstract
We have used a combination of ultrafast coherent phonon spectroscopy, ultrafast thermometry, and time-dependent Landau theory to study the inversion symmetry breaking phase transition at T_{c}=200 K in the strongly spin-orbit coupled correlated metal Cd_{2}Re_{2}O_{7}. We establish that the structural distortion at T_{c} is a secondary effect through the absence of any softening of its associated phonon mode, which supports a purely electronically driven mechanism. However, the phonon lifetime exhibits an anomalously strong temperature dependence that decreases linearly to zero near T_{c}. We show that this behavior naturally explains the spurious appearance of phonon softening in previous Raman spectroscopy experiments and should be a prevalent feature of correlated electron systems with linearly coupled order parameters.
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Affiliation(s)
- J W Harter
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
| | - D M Kennes
- Department of Physics, Columbia University, New York, New York 10027, USA
| | - H Chu
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
- Department of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - A de la Torre
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
| | - Z Y Zhao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - J-Q Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - D G Mandrus
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
| | - A J Millis
- Department of Physics, Columbia University, New York, New York 10027, USA
- Center for Computational Quantum Physics, The Flatiron Institute, New York, New York 10010, USA
| | - D Hsieh
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
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Harter JW, Zhao ZY, Yan JQ, Mandrus DG, Hsieh D. A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd
2
Re
2
O
7. Science 2017; 356:295-299. [DOI: 10.1126/science.aad1188] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 03/20/2017] [Indexed: 11/02/2022]
Affiliation(s)
- J. W. Harter
- Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125, USA
| | - Z. Y. Zhao
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
| | - J.-Q. Yan
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - D. G. Mandrus
- Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - D. Hsieh
- Department of Physics, California Institute of Technology, Pasadena, CA 91125, USA
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, CA 91125, USA
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Storchak VG, Brewer JH, Stubbs SL, Parfenov OE, Lichti RL, Mengyan PW, He J, Bredeson I, Hitchcock D, Mandrus D. Spin polarons in the correlated metallic pyrochlore Cd2Re2O7. PHYSICAL REVIEW LETTERS 2010; 105:076402. [PMID: 20868063 DOI: 10.1103/physrevlett.105.076402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2010] [Indexed: 05/29/2023]
Abstract
Muon spin rotation spectroscopy reveals localized electron states in the geometrically frustrated metallic pyrochlore Cd2Re2O7 at temperatures from 2 to 300 K in transverse magnetic fields up to 7 T. Two distinctive types of localized states, with characteristic radii of about 0.5 and 0.15 nm, are detected at high and low temperature, respectively. These states may be spin polarons, formed due to strong exchange interaction between itinerant electrons and the magnetic 5d electrons of Re ions, which may determine the peculiar electronic and magnetic properties of Cd2Re2O7.
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Affiliation(s)
- Vyacheslav G Storchak
- Russian Research center "Kurchatov Institute," Kurchatov Square 1, Moscow 123182, Russia.
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