Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy

G. Coslovich; Sascha Behl; B. Huber; H. A. Bechtel; T. Sasagawa; M. C. Martin; R. A. Kaindl

doi:10.1117/12.2080724

14 March 2015 Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy

G. Coslovich, Sascha Behl, B. Huber, H. A. Bechtel, T. Sasagawa, M. C. Martin, R. A. Kaindl

Proceedings Volume 9361, Ultrafast Phenomena and Nanophotonics XIX; 93611D (2015) https://doi.org/10.1117/12.2080724
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We discuss equilibrium and ultrafast optical pump-THz probe spectroscopy of the model stripe-ordered system La_1.75Sr_0.25NiO₄. We present a multi-oscillator analysis of the phonon bending mode splitting observed at low temperatures in equilibrium, along with a variational model for the transient THz reflectivity variations. The low temperature splitting is directly related to the formation of the long-range stripe-order, while the background conductivity is reminiscent of the opening of the mid-IR pseudogap. Ultrafast experiments in the multi-THz spectral range show strong THz reflectivity variations around the phonon bending mode frequency (≈11 THz).

Citation Download Citation

G. Coslovich, Sascha Behl, B. Huber, H. A. Bechtel, T. Sasagawa, M. C. Martin, and R. A. Kaindl "Nanoscale charge-order dynamics in stripe-phase nickelates probed via ultrafast THz spectroscopy", Proc. SPIE 9361, Ultrafast Phenomena and Nanophotonics XIX, 93611D (14 March 2015); https://doi.org/10.1117/12.2080724

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available