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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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Published on: June 28, 2018

Spin polarons in the correlated metallic pyrochlore Cd2Re2O7.

Vyacheslav G Storchak¹, Jess H Brewer, Scott L Stubbs

¹Russian Research center "Kurchatov Institute," Kurchatov Square 1, Moscow 123182, Russia. mussr@triumf.ca

Physical Review Letters

|September 28, 2010

Summary

Muon spin rotation spectroscopy detected two types of localized electron states in the metallic pyrochlore Cd2Re2O7. These findings may explain the material

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Area of Science:

Condensed Matter Physics
Materials Science
Quantum Materials

Background:

Geometric frustration in pyrochlores leads to exotic electronic properties.
Cd2Re2O7 is a metallic pyrochlore with unusual magnetic behavior.

Purpose of the Study:

To investigate the nature of localized electron states in Cd2Re2O7.
To understand the origin of peculiar electronic and magnetic properties in this material.

Main Methods:

Muon spin rotation spectroscopy (μSR).
Measurements conducted at temperatures from 2 to 300 K.
Transverse magnetic fields up to 7 T were applied.

Main Results:

Two distinct types of localized electron states were identified.
Characteristic radii of 0.5 nm (high temperature) and 0.15 nm (low temperature) were determined.
Evidence suggests these states are spin polarons.

Conclusions:

Localized spin polarons are present in Cd2Re2O7.
Strong exchange interactions between itinerant electrons and Re 5d electrons likely form these polarons.
These spin polarons may govern the unique electronic and magnetic characteristics of Cd2Re2O7.