The nature of the phase transition in La1.875Sr0.125CuO4 as determined by the Stiffnessometer - a magnetic-field-free superconducting stiffness meter

QUEST Center event
No
Speaker
(Amit Keren(Technion
Date
07/06/2018 - 16:30 - 15:30Add to Calendar 2018-06-07 15:30:00 2018-06-07 16:30:00 The nature of the phase transition in La1.875Sr0.125CuO4 as determined by the Stiffnessometer - a magnetic-field-free superconducting stiffness meter A new method to measure the superconducting stiffness tensor , without subjecting the sample to magnetic field, is applied to La1.875Sr0.125CuO4 (LSCO). The method is based on the London equation , where  is the current density and  is the vector potential. Using rotor free  and measuring  via the magnetic moment of superconducting rings, we extract . The technique, named Stiffnessometer, is sensitive to very small stiffness, which translates to penetration depth on the order of a few millimeters. We apply this method to two different LSCO rings: one with the current running only in the CuO2 planes, and another where the current must cross planes. We find different transition temperatures for the two rings, namely, there is a temperature range with two-dimensional stiffness. The Stiffnessometer results are accompanied by Low Energy mSR measurements on the same sample to determine the stiffness anisotropy at favorable temperatures.   Reznik Building 209 room 210 המחלקה לפיזיקה physics.dept@mail.biu.ac.il Asia/Jerusalem public
Place
Reznik Building 209 room 210
Abstract

A new method to measure the superconducting stiffness tensor , without subjecting the sample to magnetic field, is applied to La1.875Sr0.125CuO4 (LSCO). The method is based on the London equation , where  is the current density and  is the vector potential. Using rotor free  and measuring  via the magnetic moment of superconducting rings, we extract . The technique, named Stiffnessometer, is sensitive to very small stiffness, which translates to penetration depth on the order of a few millimeters. We apply this method to two different LSCO rings: one with the current running only in the CuO2 planes, and another where the current must cross planes. We find different transition temperatures for the two rings, namely, there is a temperature range with two-dimensional stiffness. The Stiffnessometer results are accompanied by Low Energy mSR measurements on the same sample to determine the stiffness anisotropy at favorable temperatures.

 

תאריך עדכון אחרון : 21/05/2018