Eight new high-temperature superconductors with the 1:2:4 structure

Donald E. Morris; Janice H. Nickel; John Y.T. Wei; Naggi G. Asmar; Jeffrey S. Scott; Ulrich M. Scheven; Charles T. Hultgren; Andrea G. Markelz; Jeffrey E. Post; Peter J. Heaney; David R. Veblen; Robert M. Hazen

doi:10.1103/PhysRevB.39.7347

Eight new high-temperature superconductors with the 1:2:4 structure

Donald E. Morris, Janice H. Nickel, John Y.T. Wei, Naggi G. Asmar, Jeffrey S. Scott, Ulrich M. Scheven, Charles T. Hultgren, Andrea G. Markelz, Jeffrey E. Post, Peter J. Heaney, David R. Veblen, Robert M. Hazen

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Abstract

New high-temperature superconducting compounds RBa2Cu4O8 (R=Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa2Cu4O8 are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism [(325)×10-4 emu/g at 20 K]. Critical temperatures (5781 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R2Ba4Cu7Ox compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.

Original language	English (US)
Pages (from-to)	7347-7350
Number of pages	4
Journal	Physical Review B
Volume	39
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.39.7347
State	Published - 1989

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1103/PhysRevB.39.7347

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title = "Eight new high-temperature superconductors with the 1:2:4 structure",

abstract = "New high-temperature superconducting compounds RBa2Cu4O8 (R=Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa2Cu4O8 are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism [(325)×10-4 emu/g at 20 K]. Critical temperatures (5781 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R2Ba4Cu7Ox compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.",

author = "Morris, {Donald E.} and Nickel, {Janice H.} and Wei, {John Y.T.} and Asmar, {Naggi G.} and Scott, {Jeffrey S.} and Scheven, {Ulrich M.} and Hultgren, {Charles T.} and Markelz, {Andrea G.} and Post, {Jeffrey E.} and Heaney, {Peter J.} and Veblen, {David R.} and Hazen, {Robert M.}",

year = "1989",

doi = "10.1103/PhysRevB.39.7347",

language = "English (US)",

volume = "39",

pages = "7347--7350",

journal = "Physical Review B",

issn = "0163-1829",

publisher = "American Physical Society",

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T1 - Eight new high-temperature superconductors with the 1:2:4 structure

AU - Morris, Donald E.

AU - Nickel, Janice H.

AU - Wei, John Y.T.

AU - Asmar, Naggi G.

AU - Scott, Jeffrey S.

AU - Scheven, Ulrich M.

AU - Hultgren, Charles T.

AU - Markelz, Andrea G.

AU - Post, Jeffrey E.

AU - Heaney, Peter J.

AU - Veblen, David R.

AU - Hazen, Robert M.

PY - 1989

Y1 - 1989

N2 - New high-temperature superconducting compounds RBa2Cu4O8 (R=Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa2Cu4O8 are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism [(325)×10-4 emu/g at 20 K]. Critical temperatures (5781 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R2Ba4Cu7Ox compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.

AB - New high-temperature superconducting compounds RBa2Cu4O8 (R=Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm) which share the 1:2:4 structure of YBa2Cu4O8 are bulk synthesized using a new high-pressure oxygen technique. All compounds show substantial Meissner diamagnetism [(325)×10-4 emu/g at 20 K]. Critical temperatures (5781 K) vary inversely with ion size (opposite to 1:2:3), and directly with orthorhombic distortion (which is much smaller than in corresponding 1:2:3 compounds). R2Ba4Cu7Ox compounds (with alternating blocks of 1:2:3: and 1:2:4) were also prepared. The variable oxygen stoichiometry of 1:2:3 is not shared by the 1:2:4 compounds.

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EP - 7350

JO - Physical Review B

JF - Physical Review B

IS - 10

ER -

Eight new high-temperature superconductors with the 1:2:4 structure

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All Science Journal Classification (ASJC) codes

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