OPTICAL PROPERTIES OF CUPRATE SUPERCONDUCTORS INFLUENCED BY A MAGNETIC FIELD

1991 ◽  
Vol 05 (10) ◽  
pp. 1539-1549 ◽  
Author(s):  
H. J. WEBER
Keyword(s):  
Magnetic Field ◽  
Circular Dichroism ◽  
External Magnetic Field ◽  
Time Reversal ◽  
Cuprate Superconductors ◽  
Magnetic Circular Dichroism ◽  
Magnetic Field Effects ◽  
Transmission Measurements ◽  
Circular Dichroïsm ◽  
The Magnetic Field

Reflection measurements on a one-domain single crystal of YBa 2 Cu 3 O 7-δ and transmission measurements on single crystals of Bi 2 Sr 2 CaCu 2 O 8 show a state of spontaneously broken symmetry below certain transition temperatures T s somewhat above the respective superconduction temperature T c . In both materials the sign of the effect can be controlled by an external magnetic field. In transmission measurements on films of YBa 2 Cu 3 O 7-δ near T s a remanent circular dichroism is observed after applying an external magnetic field. Furthermore, the films show a Curie-Weiss type increase of magnetic circular dichroism near T s . The magnetic field effects are considered as evidence for a state with broken time reversal symmetry below T s .

scholarly journals Ultralow-temperature device dedicated to soft X-ray magnetic circular dichroism experiments

2018 ◽  
Vol 25 (6) ◽  
pp. 1727-1735 ◽  
Author(s):  
J.-P. Kappler ◽  
E. Otero ◽  
W. Li ◽  
L. Joly ◽  
G. Schmerber ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Circular Dichroism ◽  
Synchrotron Radiation ◽  
Eddy Current ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Ultralow Temperature ◽  
X Ray Absorption ◽  
Circular Dichroïsm ◽  
The Magnetic Field

A new ultralow-temperature setup dedicated to soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) experiments is described. Two experiments, performed on the DEIMOS beamline (SOLEIL synchrotron), demonstrate the outstanding performance of this new platform in terms of the lowest achievable temperature under X-ray irradiation (T = 220 mK), the precision in controlling the temperature during measurements as well as the speed of the cooling-down and warming-up procedures. Moreover, owing to the new design of the setup, the eddy-current power is strongly reduced, allowing fast scanning of the magnetic field in XMCD experiments; these performances lead to a powerful device for X-ray spectroscopies on synchrotron-radiation beamlines facilities.

Soft X-ray Magnetic Circular Dichroism of a CoFe/MnIr Exchange Bias Film under Pulsed High Magnetic Field

2011 ◽  
Vol 4 (6) ◽  
pp. 066602 ◽  
Author(s):  
Tetsuya Nakamura ◽  
Yasuo Narumi ◽  
Toko Hirono ◽  
Misaki Hayashi ◽  
Kenji Kodama ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Circular Dichroism ◽  
High Magnetic Field ◽  
Exchange Bias ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Pulsed High Magnetic Field ◽  
Circular Dichroïsm

Temperature and magnetic field dependence of the soft X-ray magnetic circular dichroism intensity for the Mn-L3 edge of MnFeP0.78Ge0.22

2007 ◽  
Vol 310 (2) ◽  
pp. e1010-e1011 ◽  
Author(s):  
Masanori Tsunekawa ◽  
Shin Imada ◽  
Atsushi Matsumoto ◽  
Atsushi Yamasaki ◽  
Shigemasa Suga ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Circular Dichroism ◽  
Field Dependence ◽  
Magnetic Field Dependence ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Circular Dichroïsm

A Design of Cesium Atomic Magnetometer Based on Circular Dichroism

2012 ◽  
Vol 203 ◽  
pp. 268-272 ◽  
Author(s):  
Xian Jin Zeng ◽  
Mo Si Hao ◽  
Qing Meng Li ◽  
Qiang Liu ◽  
Jun Hai Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Circular Dichroism ◽  
Spin Exchange ◽  
Laser Light ◽  
Tracking System ◽  
Frequency Tracking ◽  
Highly Sensitive ◽  
Optical Configuration ◽  
Circular Dichroïsm ◽  
The Magnetic Field

Recently, atomic magnetometers have been reported as the most sensitive magnetometers by completely eliminating the spin exchange relaxation. In this paper, we described a design of highly sensitive cesium atomic magnetometer based on circular dichroism, which had the advantage of easily locking the probing laser to the necessary frequency compared with those based on circular birefringence. In order to polarize the cesium atoms uniformly, the pumping laser light was separated into two counter-propagating and counter-circular polarization beams through the atomic vapor cell. We employed a circular analyzer optical configuration to measure the ellipticity of the probing light, which indicated the amplitude of the magnetic field. The external magnetic field was tracked by a digital auto frequency tracking system.

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