Search Menu
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information
Search Scholarly Publications

Title: Ultrafast quasiparticle dynamics in the correlated semimetal Ca3Ru2O7

Journal Article · · Physical Review B
 [1];  [2];  [3];  [2];  [1];  [4];  [5];  [3];  [2];  [1]
  1. Pennsylvania State University, University Park, PA (United States)
  2. University of California San Diego, La Jolla, CA (United States)
  3. Northwestern University, Evanston, IL (United States)
  4. Tulane University, New Orleans, LA (United States)
  5. Tulane University, New Orleans, LA (United States); Pennsylvania State University, University Park, PA (United States)
+ Show Author Affiliations

The correlated polar semimetal Ca3Ru2O7 exhibits a rich phase diagram including two magnetic transitions (TN = 56 K and TC = 48 K) with the appearance of an insulating-like pseudogap (at TC). In addition, there is a crossover back to metallic behavior at T* = 30 K, the origin of which is still under debate. We utilized ultrafast optical-pump optical-probe spectroscopy to investigate quasiparticle dynamics as a function of temperature in this enigmatic quantum material. We identify two dynamical processes, both of which are influenced by the onset of the pseudogap. This includes electron-phonon relaxation and, below TC, the onset of a phonon bottleneck hindering the relaxation of quasiparticles across the pseudogap. We introduce a gap-modified two-temperature model to describe the temperature dependence of electron-phonon thermalization, and use the Rothwarf-Taylor to model the phonon bottleneck. In conjunction with density functional theory, our experimental results synergistically reveal the origin of the T-dependent pseudogap. Further, our data and analysis indicate that T* emerges as a natural consequence of T-dependent gapping out of carriers, and does not correspond to a separate electronic transition. Furthermore, our results highlight the value of low-fluence ultrafast optics as a sensitive probe of low-energy electronic structure, thermodynamic parameters, and transport properties of Ruddlesden-Popper ruthenates.

Research Organization:
Louisiana State Univ., Baton Rouge, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012432; SC00012375
OSTI ID:
1611798
Alternate ID(s):
OSTI ID: 1505002; OSTI ID: 1670462
Journal Information:
Physical Review B, Vol. 99, Issue 15; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

References (35)

Nested Fermi Surface and Electronic Instability in Ca 3 Ru 2 O 7 journal March 2006
Measurement of Recombination Lifetimes in Superconductors journal July 1967
Raman-scattering study of the charge and spin dynamics of the layered ruthenium oxide Ca 3 Ru 2 O 7 journal September 1999
Excited-state vibrational dynamics toward the polaron in methylammonium lead iodide perovskite journal June 2018
Probing femtosecond lattice displacement upon photo-carrier generation in lead halide perovskite journal May 2018
Projector augmented-wave method journal December 1994
Observation of Quasi-Two-Dimensional Polar Domains and Ferroelastic Switching in a Metal, Ca 3 Ru 2 O 7 journal April 2018
Orbitally driven behaviour: Mott transition, quantum oscillations and colossal magnetoresistance in bilayered Ca 3 Ru 2 O 7 journal January 2004
Free Carrier Emergence and Onset of Electron–Phonon Coupling in Methylammonium Lead Halide Perovskite Films journal December 2017
From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca 3 (Ru 1 − x Ti x ) 2 O 7 journal February 2013
Quasi-two-dimensional metallic ground state of Ca 3 Ru 2 O 7 journal June 2004
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Orbital-free density functional theory implementation with the projector augmented-wave method journal December 2014
Quasiparticle dynamics and gap structure in Hg Ba 2 Ca 2 Cu 3 O 8 + δ investigated with femtosecond spectroscopy journal January 2001
Quasiparticle relaxation dynamics in superconductors with different gap structures: Theory and experiments on YBa 2 Cu 3 O 7 − δ journal January 1999
Pulse accumulation, radial heat conduction, and anisotropic thermal conductivity in pump-probe transient thermoreflectance journal November 2008
"Special points for Brillouin-zone integrations"—a reply journal August 1977
Pair-Breaking and Superconducting State Recovery Dynamics in M g B 2 journal December 2003
Restoring the Density-Gradient Expansion for Exchange in Solids and Surfaces journal April 2008
Pseudogap Dependence of the Optical Conductivity Spectra of Ca 3 Ru 2 O 7 : A Possible Contribution of the Orbital Flip Excitation journal March 2007
Superconductivity in a layered perovskite without copper journal December 1994
Femtosecond spectroscopy of electron-electron and electron-phonon energy relaxation in Ag and Au journal May 1995
Quasiparticle relaxation across the spin-density-wave gap in the itinerant antiferromagnet U Ni Ga 5 journal October 2006
Dynamics of photoexcited quasiparticles in heavy electron compounds journal April 2006
Single Particle and Collective Excitations in the One-Dimensional Charge Density Wave Solid K 0.3 MoO 3 Probed in Real Time by Femtosecond Spectroscopy journal July 1999
Quantum theory of quantum Hall smectics journal February 2000
Band-dependent Quasiparticle Dynamics in Single Crystals of the Ba 0.6 K 0.4 Fe 2 As 2 Superconductor Revealed by Pump-Probe Spectroscopy journal July 2010
Commensurate-incommensurate magnetic phase transition in the Fe-doped bilayer ruthenate Ca 3 Ru 2 O 7 journal June 2014
Single-quasiparticle stability and quasiparticle-pair decay in YBa 2 Cu 3 O 6.5 journal July 2004
Observation of a Metallic Antiferromagnetic Phase and Metal to Nonmetal Transition in Ca 3 Ru 2 O 7 journal March 1997
Kinetics of a Superconductor Excited with a Femtosecond Optical Pulse journal September 2005
Existence of electron and hole pockets and partial gap opening in the correlated semimetal Ca 3 Ru 2 O 7 journal January 2018
Observation of Competing Order in a High- T c Superconductor Using Femtosecond Optical Pulses journal October 2007
Ca 3 Ru 2 O 7 : Density Wave Formation and Quantum Oscillations in the Hall Resistivity journal February 2010

Figures / Tables (13)

Figure 1(p. 3)figure Figure 1
Figure 2(p. 4)figure Figure 2
Figure 3(p. 5)figure Figure 3
Figure 4(p. 6)figure Figure 4
Figure 5(p. 6)figure Figure 5
Figure 6(p. 7)figure Figure 6
Figure 7(p. 7)figure Figure 7
Figure 8(p. 7)figure Figure 8
Figure 10(p. 8)figure Figure 10
Figure 11(p. 8)figure Figure 11
Figure 9(p. 8)figure Figure 9
Figure 12(p. 9)figure Figure 12
Figure 13(p. 9)figure Figure 13

Similar Records

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Materials Science
Physics
Density of states
Electrical conductivity
Fermi surface
First-principle calculations
Quasiparticles & collective excitations
Thermal properties
Single crystal materials
Strongly correlated systems
Ultrafast pump-probe spectroscopy