Experimental determination of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>B</mi><mo>−</mo><mi>T</mi></math> phase diagram of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">YBa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>7</mn><mi>−</mi><mi>δ</mi></mrow></msub></mrow></math> to 150 T for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">B</mi><mi>⊥</mi><mi mathvariant="normal">c</mi></math>

J. L. O’Brien; H. Nakagawa; A. S. Dzurak; R. G. Clark; B. E. Kane; N. E. Lumpkin; R. P. Starrett; N. Muira; E. E. Mitchell; J. D. Goettee; D. G. Rickel; J. S. Brooks

doi:10.1103/PhysRevB.61.1584

Experimental determination of the $B - T$ phase diagram of ${YBa}_{2} {Cu}_{3} O_{7 - δ}$ to 150 T for $B ⊥ c$

J. L. O’Brien, H. Nakagawa, A. S. Dzurak, R. G. Clark, B. E. Kane, N. E. Lumpkin, R. P. Starrett, N. Muira, E. E. Mitchell, J. D. Goettee, D. G. Rickel, and J. S. Brooks

Phys. Rev. B 61, 1584 – Published 1 January 2000

Abstract

The $B - T$ phase diagram for thin film ${YBa}_{2} {Cu}_{3} O_{7 - δ}$ with B parallel to the superconducting layers has been constructed from GHz transport measurements to 150 T. Up to 110 T the upper critical field is found to be linear in T and in remarkable agreement with extrapolation of the longstanding result of Welp et al. arising from magnetization measurements to 6 T. Beyond this a departure from linear behavior occurs at $T = 74 K,$ consistent with previous low-temperature data. Evidence for a transition from a high- $T$ regime dominated by orbital effects, to a low- $T$ regime, where paramagnetic limiting drives the quenching of superconductivity, is seen.

Received 27 September 1999

DOI:https://doi.org/10.1103/PhysRevB.61.1584

Authors & Affiliations

J. L. O’Brien^*

National Pulsed Magnet Laboratory and Semiconductor Nanofabrication Facility, School of Physics, University of New South Wales, Sydney 2052, Australia

H. Nakagawa

Institute for Solid State Physics, University of Tokyo, 7-22-1 Roppongi, 106 Tokyo, Japan

A. S. Dzurak, R. G. Clark, B. E. Kane, N. E. Lumpkin, and R. P. Starrett

National Pulsed Magnet Laboratory and Semiconductor Nanofabrication Facility, School of Physics, University of New South Wales, Sydney 2052, Australia

N. Muira