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Condensed Matter Seminars

ics Condensed Matter
Thursday, March 29, 2007
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Andras Janossy [Host: Stu Wolf]
Budapest University of Technology and Economics
"Search for stripes in lightly hole doped antiferromagnetic YBCO"
 Slideshow (PDF)
Stripes, a periodic spin and charge modulation in superconducting and antiferromagnetic cuprates are a manifestation of an instability of the two dimensional hole system. A multifrequency electron spin resonance study of the antiferromagnetic domain structure in undoped and lightly Ca doped antiferromagnetic Y(Gd)Ba2Cu3O6 single crystals will be discussed. Gd substituting for Y serves as a non-perturbing localised ESR probe of the antiferromagnetic CuO2 layers. Hole doping, variation of temperature and magnetic fields change the antiferromagnetic structure. ESR and infrared transmission experiments in high magnetic fields show that the stripe structure is not an array of hole rich lines in YBCO.

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