Quasiparticle relaxation dynamics in URu2-xFexSi2 single crystals

Kissin, Peter; Ran, Sheng; Lovinger, Dylan; Thorsmølle, Verner K.; Kanchanavatee, Noravee; Huang, Kevin; Maple, M. Brian; Averitt, Richard D.

doi:10.1103/physrevb.99.165144

Title: Quasiparticle relaxation dynamics in ${URu}_{2 - x} {Fe}_{x} {Si}_{2}$ single crystals

Journal Article · Mon Apr 29 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.165144· OSTI ID:1609541

Kissin, Peter ^[1]; Ran, Sheng ^[2]; Lovinger, Dylan ^[1]; Thorsmølle, Verner K. ^[1]; Kanchanavatee, Noravee ^[3]; Huang, Kevin ^[4]; Maple, M. Brian ^[1]; Averitt, Richard D. ^[1]

Univ. of California San Diego, La Jolla, CA (United States)
Univ. of California San Diego, La Jolla, CA (United States); Univ. of Maryland, College Park, MD (United States); National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Univ. of California San Diego, La Jolla, CA (United States); Chulalongkorn Univ., Pathumwan (Thailand)
Univ. of California San Diego, La Jolla, CA (United States); Florida State Univ., Tallahassee, FL (United States)

We investigate quasiparticle relaxation dynamics in URu_2–xFe_xSi₂ single crystals using ultrafast optical-pump optical-probe (OPOP) spectroscopy as a function of temperature and Fe substitution (x), crossing from the hidden-order (HO) phase (x = 0) to the large-moment antiferromagnet (LMAFM) phase (x = 0 .12). Here, at low temperature, the dynamics for x = 0 and x = 0 .12 are consistent with the low-energy electronic structure of the HO and LMAFM phases that emerge from the high-temperature paramagnetic (PM) phase. In contrast, near the bicritical point separating HO and LMAFM (x = 0 .1), two transitions occur over a narrow temperature range (from 15.5–17.5 K). A PM to HO transition occurs at an intermediate temperature followed by a transition to the LMAFM phase at lower temperature. While the data at low temperatures are consistent with the expected coexistence of LMAFM and HO, the data in the intermediate temperature phase are not, and instead suggest the possibility of an unexpected coexistence of HO and PM. Additionally, the dynamics in the PM phase reflect the presence of a hybridization gap as well as strongly interacting spin and charge degrees of freedom. OPOP yields insights into meV-scale electrodynamics with sub-Kelvin temperature resolution, providing a complementary approach to study low-energy electronic structure in quantum materials.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-04ER46105; DMR-1810310; W911NF-16-1-0361

OSTI ID:: 1609541

Alternate ID(s):: OSTI ID: 1509763

Journal Information:: Physical Review B, Vol. 99, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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