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Large low-temperature specific heat in pyrochlore Bi2Ti2O7

Large low-temperature specific heat in pyrochlore Bi2Ti2O7
Large low-temperature specific heat in pyrochlore Bi2Ti2O7
Both amorphous and crystalline materials frequently exhibit low-temperature specific heats in excess of what is predicted using the Debye model. The signature of this excess specific heat is a peak observed in C/T3 versus T. To understand the curious absence of long-range ordering of local distortions in the crystal structure of pyrochlore Bi2Ti2O7, we have measured the specific heat of crystalline Bi2Ti2O7 and related compounds. We find that the peak in C/T3 versus T in Bi2Ti2O7 falls at a substantially lower temperature than other similar compounds consistent with the presence of disorder. This thermodynamic evidence for disorder in crystalline Bi2Ti2O7 is consistent with quenched configurational disorder among Bi lone pairs produced by the geometrical frustration, which could represent a possible realization of “charge ice.”
1550-235X
224111
Melot, Brent C.
91d5bcda-cc10-4607-9a89-185525ca02ef
Tackett, Ronald
5d2900fe-6248-4a09-be2c-c906258f6159
O’Brien, Jim
ea093c5e-b821-46bd-b203-f50a89063ba8
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Lawes, Gavin
b89ec5ff-1383-4f18-8ce2-4fc063575015
Seshadri, Ram
591864b1-7ea4-418a-953a-be002947842a
Ramirez, Arthur P.
4a54d28a-bc49-4b79-995b-3515e4f14939
Melot, Brent C.
91d5bcda-cc10-4607-9a89-185525ca02ef
Tackett, Ronald
5d2900fe-6248-4a09-be2c-c906258f6159
O’Brien, Jim
ea093c5e-b821-46bd-b203-f50a89063ba8
Hector, Andrew L.
f19a8f31-b37f-4474-b32a-b7cf05b9f0e5
Lawes, Gavin
b89ec5ff-1383-4f18-8ce2-4fc063575015
Seshadri, Ram
591864b1-7ea4-418a-953a-be002947842a
Ramirez, Arthur P.
4a54d28a-bc49-4b79-995b-3515e4f14939

Melot, Brent C., Tackett, Ronald, O’Brien, Jim, Hector, Andrew L., Lawes, Gavin, Seshadri, Ram and Ramirez, Arthur P. (2009) Large low-temperature specific heat in pyrochlore Bi2Ti2O7. Physical Review B, 79 (22), 224111. (doi:10.1103/PhysRevB.79.224111).

Record type: Article

Abstract

Both amorphous and crystalline materials frequently exhibit low-temperature specific heats in excess of what is predicted using the Debye model. The signature of this excess specific heat is a peak observed in C/T3 versus T. To understand the curious absence of long-range ordering of local distortions in the crystal structure of pyrochlore Bi2Ti2O7, we have measured the specific heat of crystalline Bi2Ti2O7 and related compounds. We find that the peak in C/T3 versus T in Bi2Ti2O7 falls at a substantially lower temperature than other similar compounds consistent with the presence of disorder. This thermodynamic evidence for disorder in crystalline Bi2Ti2O7 is consistent with quenched configurational disorder among Bi lone pairs produced by the geometrical frustration, which could represent a possible realization of “charge ice.”

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Published date: 12 June 2009

Identifiers

Local EPrints ID: 145943
URI: http://eprints.soton.ac.uk/id/eprint/145943
ISSN: 1550-235X
PURE UUID: bde1bb84-abd2-498e-a813-2a12dc37ea3c
ORCID for Andrew L. Hector: ORCID iD orcid.org/0000-0002-9964-2163

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Date deposited: 20 Apr 2010 10:03
Last modified: 26 Nov 2019 01:59

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