The procedure for measuring ac conductivity at microwave frequencies is outlined. The Tc of typical 123 oxide superconductors obtained by ac measurement is lower than that obtained by dc measurement. Possible reasons for this observation are also considered. Copyright © 1991 WILEY‐VCH Verlag GmbH &amp; Co. KGaA

R. Pragasam

N. S. Raman

Vemuri Rama Krishna Murthy

Balasubramanian Viswanathan

CERAMIC MATERIALS--SUPERCONDUCTIVITY

COPPER OXIDES--ELECTRIC PROPERTIES

Electric Measurements--Conductivity

MICROWAVES--EFFECTS

SUPERCONDUCTING MATERIALS--TRANSITION TEMPERATURE

AC conductivity

MICROWAVE CONDUCTIVITY EVALUATION

Microwave frequencies

Yttrium barium copper oxides

High temperature superconductors

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

physica status solidi (a)

A technique for the simultaneous measurement of the dc conductivity and microwave (ac) properties on the same sample is described. The difference in transition temperatures between dc and microwave frequencies (i) at ≈6.2 GHz (J‐band), ≈9.2 GHz (X‐band), ≈13.5 GHz (P‐band), and ≈17.8 GHz (P‐band) on YBaCu oxide and (ii) at ≈6.2 GHz on YBaCu oxide thin films and BiPbSrCaCu oxide has been evaluated. From the observations of these simultaneous measurements, the energy dependent variations of these simultaneous measurements, the energy dependent variation of ΔTc (Tc(dc) – Tc(ac)) and the non‐zero microwave power loss beyond the superconducting transition temperature are discussed. Copyright © 1994 WILEY‐VCH Verlag GmbH &amp; Co. KGaA

Measurement of transition temperatures (simultaneously at DC and microwave frequencies) on high‐Tc superconducting systems

Asymmetric Passive Components in Microwave Integrated Circuits

Wiley Series in Microwave and Optical Engineering

Japanese Journal of Applied Physics

Evaluation of Microwave Conductivity in Superconductor YBa2Cu3O7-xUsing a Cavity Perturbation Technique

Measurement of RF Superconductivity in YBa2Cu3O7-xwith the Standing-Wave Method at 9 GHz

Physical Review B

Microwave study of the high-TcsuperconductorLa1.8Sr0.2CuO4

Substitution Effect of Sr for Ba of High-TcSuperconducting YBa2Cu3O7-yCeramics

Conductivity Measurements of Some High‐TC Superconducting Materials at Microwave Frequencies [Es wird ein Verfahren zur Messung der Wechselstromleitfähigkeit im Mikrowellenfrequenzbereich vorgestellt. Die Tc von typischen 123 Oxidsupraleitern, die mit Wechselstrommessungen erhalten werden, sind niedriger als die mit Gleichstrommessuugen erhaltenen. Mögliche Gründe für diese Beobachtung werden diskutiert.]

Journal	physica status solidi (a)
ISSN	00318965
Open Access	No