Magnetic phase transition in superconducting <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">YRu</mi></mrow><mrow><mn>0.95</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>0.05</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>6</mn></mrow></msub></mrow></math></span> observed by the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>99</mn></mrow></msup></mrow><mi mathvariant="normal">Ru</mi></math></span> Mössbauer effect

Michael DeMarco; H. A. Blackstead; John D. Dow; M. K. Wu; D. Y. Chen; F. Z. Chien; Michael Haka; Steve Toorongian; Joel Fridmann

doi:10.1103/PhysRevB.62.14301

Magnetic phase transition in superconducting ${Sr}_{2} {YRu}_{0.95} {Cu}_{0.05} O_{6}$ observed by the $^{99} Ru$ Mössbauer effect

Michael DeMarco, H. A. Blackstead, John D. Dow, M. K. Wu, D. Y. Chen, F. Z. Chien, Michael Haka, Steve Toorongian, and Joel Fridmann

Phys. Rev. B 62, 14301 – Published 1 December 2000

Abstract

$^{99} Ru$ Mössbauer effect measurements at 4.2, 23, 30, and 40 K show that the hyperfine magnetic field vanishes near 30 K, lower than the superconducting onset temperature of 45 K in ${Sr}_{2} {YRu}_{0.95} {Cu}_{0.05} O_{6} .$ The data confirm that superconductivity and homogeneous magnetic order coexist. The hyperfine magnetic field measured at 4.2 K is 58.5(0.8) T. The well-resolved set of 18 lines in the 4.2 K measurement enabled a determination of a new value, -0.293(0.005) nm, for the nuclear magnetic moment of the 3/2 state of $^{99} Ru .$ The isomer shift in this compound was measured to be 0.13(0.01) mm/s and it is consistent with a +5 charge state of Ru.

Received 15 June 2000

DOI:https://doi.org/10.1103/PhysRevB.62.14301

Authors & Affiliations

Michael DeMarco^1,2, H. A. Blackstead³, John D. Dow⁴, M. K. Wu⁵, D. Y. Chen^5,*, F. Z. Chien⁶, Michael Haka⁷, Steve Toorongian⁷, and Joel Fridmann²

¹Department of Physics, State University of New York, Buffalo, New York 14260
²Department of Physics, Buffalo State College, Buffalo, New York 14222
³Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556
⁴Department of Physics, Arizona State University, Tempe, Arizona 85287-1504
⁵Department of Physics and Material Science Center, National Tsing Hua University, Hsinchu, Taiwan
⁶Physics Department, Tamkang University, Tamsui, Taiwan
⁷Nuclear Medicine Department, State University of New York, Buffalo, New York 14260

^*Deceased.

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Vol. 62, Iss. 21 — 1 December 2000

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