Crystal field excitations in the Raman spectra of Fe Se1 - x

Z. Qin; C. Zhang; S. O'Malley; K. Lo; T. Zhou; S. W. Cheong

doi:10.1016/j.ssc.2010.01.024

Crystal field excitations in the Raman spectra of Fe Se_{1 - x}

Z. Qin, C. Zhang, S. O'Malley, K. Lo, T. Zhou, S. W. Cheong

New Jersey Institute of Technology, Rutgers, The State University

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Raman spectra of polycrystalline Fe Se_{1 - x} (x ∼ 0.03) with a superconducting transition temperature of 9 K have been measured from room temperature down to 5 K. A mode at about 185 cm^{- 1} is observed throughout the whole temperature range. It is assigned as the B_{1 g} phonon mode. This phonon mode hardens with decreasing temperature, but undergoes no noticeable change across both the structural phase transition and the superconducting transition, similar to the Raman phonon modes observed in the 1111 and 122 systems. Surprisingly, we also observed several additional Raman modes between 200 and 700 cm^-1, which we assigned as due to the crystal field excitations of the 3d electrons in Fe^{2 +} ions. These modes undergo abrupt change near the structural phase transition around 100 K, but do not exhibit much change across the superconducting transition.

Original language	American English
Pages (from-to)	768-771
Number of pages	4
Journal	Solid State Communications
Volume	150
Issue number	15-16
DOIs	https://doi.org/10.1016/j.ssc.2010.01.024
State	Published - Apr 2010

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

Keywords

A. Superconductors
D. Crystal field excitations
E. Raman scattering

Access to Document

10.1016/j.ssc.2010.01.024

Cite this

@article{f73b68d713f54afd8b432f13dc7c426f,

title = "Crystal field excitations in the Raman spectra of Fe Se1 - x",

abstract = "Raman spectra of polycrystalline Fe Se1 - x (x ∼ 0.03) with a superconducting transition temperature of 9 K have been measured from room temperature down to 5 K. A mode at about 185 cm- 1 is observed throughout the whole temperature range. It is assigned as the B1 g phonon mode. This phonon mode hardens with decreasing temperature, but undergoes no noticeable change across both the structural phase transition and the superconducting transition, similar to the Raman phonon modes observed in the 1111 and 122 systems. Surprisingly, we also observed several additional Raman modes between 200 and 700 cm-1, which we assigned as due to the crystal field excitations of the 3d electrons in Fe2 + ions. These modes undergo abrupt change near the structural phase transition around 100 K, but do not exhibit much change across the superconducting transition.",

keywords = "A. Superconductors, D. Crystal field excitations, E. Raman scattering",

author = "Z. Qin and C. Zhang and S. O'Malley and K. Lo and T. Zhou and Cheong, \{S. W.\}",

note = "Funding Information: This work is supported by DOE grant DE-FG02-07ER46382.",

year = "2010",

month = apr,

doi = "10.1016/j.ssc.2010.01.024",

language = "American English",

volume = "150",

pages = "768--771",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

number = "15-16",

}

TY - JOUR

T1 - Crystal field excitations in the Raman spectra of Fe Se1 - x

AU - Qin, Z.

AU - Zhang, C.

AU - O'Malley, S.

AU - Lo, K.

AU - Zhou, T.

AU - Cheong, S. W.

N1 - Funding Information: This work is supported by DOE grant DE-FG02-07ER46382.

PY - 2010/4

Y1 - 2010/4

N2 - Raman spectra of polycrystalline Fe Se1 - x (x ∼ 0.03) with a superconducting transition temperature of 9 K have been measured from room temperature down to 5 K. A mode at about 185 cm- 1 is observed throughout the whole temperature range. It is assigned as the B1 g phonon mode. This phonon mode hardens with decreasing temperature, but undergoes no noticeable change across both the structural phase transition and the superconducting transition, similar to the Raman phonon modes observed in the 1111 and 122 systems. Surprisingly, we also observed several additional Raman modes between 200 and 700 cm-1, which we assigned as due to the crystal field excitations of the 3d electrons in Fe2 + ions. These modes undergo abrupt change near the structural phase transition around 100 K, but do not exhibit much change across the superconducting transition.

AB - Raman spectra of polycrystalline Fe Se1 - x (x ∼ 0.03) with a superconducting transition temperature of 9 K have been measured from room temperature down to 5 K. A mode at about 185 cm- 1 is observed throughout the whole temperature range. It is assigned as the B1 g phonon mode. This phonon mode hardens with decreasing temperature, but undergoes no noticeable change across both the structural phase transition and the superconducting transition, similar to the Raman phonon modes observed in the 1111 and 122 systems. Surprisingly, we also observed several additional Raman modes between 200 and 700 cm-1, which we assigned as due to the crystal field excitations of the 3d electrons in Fe2 + ions. These modes undergo abrupt change near the structural phase transition around 100 K, but do not exhibit much change across the superconducting transition.

KW - A. Superconductors

KW - D. Crystal field excitations

KW - E. Raman scattering

UR - https://www.scopus.com/pages/publications/77649338493

UR - http://www.scopus.com/inward/citedby.url?scp=77649338493&partnerID=8YFLogxK

UR - https://www.scopus.com/pages/publications/77649338493

UR - https://www.scopus.com/inward/citedby.url?scp=77649338493&partnerID=8YFLogxK

U2 - 10.1016/j.ssc.2010.01.024

DO - 10.1016/j.ssc.2010.01.024

M3 - Article

SN - 0038-1098

VL - 150

SP - 768

EP - 771

JO - Solid State Communications

JF - Solid State Communications

IS - 15-16

ER -