Unknown

Dataset Information

0

Magnetic-Field-Induced Suppression of Jahn-Teller Phonon Bands in (La0.6Pr0.4)0.7Ca0.3MnO3: the Mechanism of Colossal Magnetoresistance shown by Raman Spectroscopy.

ABSTRACT: A long-standing issue in the physics of the colossal magnetoresistance is the role of electron-phonon coupling, which manifests itself as Jahn-Teller polarons. The origin and architecture of polarons makes it possible to study their behavior by Raman spectroscopy, which allows to analyze the polaronic behavior in an applied magnetic field. We performed magnetic-field-dependent Raman spectroscopy on thin films of (La0.6Pr0.4)0.7Ca0.3MnO3 in a range of H = 0-50 kOe and compared the obtained Raman spectra with the magnetic field behavior of the electrical resistivity. In the vicinity of the Curie temperature, TC = 197 K, the intensity of the Jahn-Teller stretching mode at 614 cm-1 and of the bending mode at 443 cm-1 was found to be suppressed and enhanced, respectively. This observed behavior has a remarkable similarity with the field and temperature dependence of the colossal magnetoresistance in (La0.6Pr0.4)0.7Ca0.3MnO3. Our work provides direct evidence that the reduction of the amount of Jahn-Teller polarons at the phase transition is the main mechanism underlying the colossal magnetoresistance.

SUBMITTER: Merten S 

PROVIDER: S-EPMC6382866 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature

Json Xml
altmetric image

Publications

Magnetic-Field-Induced Suppression of Jahn-Teller Phonon Bands in (La<sub>0.6</sub>Pr<sub>0.4</sub>)<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>: the Mechanism of Colossal Magnetoresistance shown by Raman Spectroscopy.

Merten S S   Shapoval O O   Damaschke B B   Samwer K K   Moshnyaga V V  

Scientific reports 20190220 1

A long-standing issue in the physics of the colossal magnetoresistance is the role of electron-phonon coupling, which manifests itself as Jahn-Teller polarons. The origin and architecture of polarons makes it possible to study their behavior by Raman spectroscopy, which allows to analyze the polaronic behavior in an applied magnetic field. We performed magnetic-field-dependent Raman spectroscopy on thin films of (La<sub>0.6</sub>Pr<sub>0.4</sub>)<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> in a  ...[more]

Similar Datasets

Unknown Abnormal percolative transport and colossal electroresistance induced by anisotropic strain in (011)-Pr(0.7)(Ca(0.6)Sr(0.4))(0.3)MnO₃/PMN-PT heterostructure.
| S-EPMC4233337 | biostudies-literature
Unknown Interfacial reconstruction in La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> thin films: giant low-field magnetoresistance.
| S-EPMC9418895 | biostudies-literature
Unknown Effect of ball milling time on Sr<sub>0.7</sub>Sm<sub>0.3</sub>Fe<sub>0.4</sub>Co<sub>0.6</sub>O<sub>2.65</sub> perovskites and their application as semiconductor layers in dye-sensitized solar cells.
| S-EPMC11259836 | biostudies-literature
Unknown Rational Development of IT-SOFC Electrodes Based on the Nanofunctionalization of La<sub>0.6</sub>Sr<sub>0.4</sub>Ga<sub>0.3</sub>Fe<sub>0.7</sub>O<sub>3</sub> with Oxides. Part 2: Anodes by Means of Manganite Oxide.
| S-EPMC9832435 | biostudies-literature
Unknown Manipulating magnetoelectric properties by interfacial coupling in La<sub>0.3</sub>Sr<sub>0.7</sub>MnO<sub>3</sub>/Ba<sub>0.7</sub>Sr<sub>0.3</sub>TiO<sub>3</sub> superlattices.
| S-EPMC5550473 | biostudies-literature
Unknown Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU.
| S-EPMC7477809 | biostudies-literature
Unknown Pressure Tuning the Jahn-Teller Transition Temperature in NaNiO<sub>2</sub>.
| S-EPMC9098164 | biostudies-literature
Unknown Spin-orbital Jahn-Teller bipolarons.
| S-EPMC11258125 | biostudies-literature
Unknown Displacive Jahn-Teller Transition in NaNiO&lt;sub&gt;2&lt;/sub&gt;.
| S-EPMC11528442 | biostudies-literature
Unknown Magnetocapacitance in La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub>/Pb(Zr<sub>0.2</sub>Ti<sub>0.8</sub>)O<sub>3</sub>/La<sub>0.7</sub>Sr<sub>0.3</sub>MnO<sub>3</sub> multiferroic heterostructures.
| S-EPMC5529449 | biostudies-literature