Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/655991
Title: Revisiting of Specific Heat of Nonsuperconducting PrBCO Ceramics in Orthorhombic Phase: Signature of Magnetic Phase Transitions at Low Temperatures
Authors: Mahieddine Lahoubi
subject: Magnetic phase transition|Non-superconducting PrBCO|Calorimetry|Antiferromagnetic materials
Year: 2016
Publisher: IEEE
Abstract: The magnetic and electronic contributions of the Pr ions only to the specific heat C<sub>p</sub>(T) and entropy S(T) defined by &#x0394;C<sub>p</sub>(T) and &#x0394;S(T), respectively, are revisited at low temperatures for nonsuperconducting PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> ceramics with x = 1 and 0.95. Two small anomalies are observed below the well-known anomaly due to the antiferromagnetic (AFM) ordering of the Pr sublattice at the Ne&#x0301;el temperature T<sub>N</sub> = 17.5 and 14 K, respectively. The first one, which occurs near the transition temperature T<sub>2</sub> ~ 10.5 and ~9.5 K, respectively, is due to the effect of the previous spin reorientation phase transition of the Pr moments. Whereas the second one, which appears for both states at the same critical temperature T<sub>cr</sub> ~ 4-5 K, is caused by the noncollinear magnetic reordering of the Pr subsystem. A phenomenological analysis is used in the fitting procedure below T<sub>cr</sub>. The values of the associated electronic linear coefficient &#x0394;&#x03B3; are found for both states fairly lower than those deduced from previous measurements on ceramics and single crystals in orthorhombic phase. In addition to the common T3 contribution to &#x0394;C<sub>p</sub>(T), which characterizes the Pr AFM ordering, the T5 contribution associated with the rather significant Pr-Cu(2) magnetic coupling introduces some nonlinear magnetic effects. All results are discussed and compared with earlier reports.
URI: http://localhost/handle/Hannan/160405
http://localhost/handle/Hannan/655991
ISSN: 1051-8223
1558-2515
volume: 26
issue: 3
Appears in Collections:2016

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Title: Revisiting of Specific Heat of Nonsuperconducting PrBCO Ceramics in Orthorhombic Phase: Signature of Magnetic Phase Transitions at Low Temperatures
Authors: Mahieddine Lahoubi
subject: Magnetic phase transition|Non-superconducting PrBCO|Calorimetry|Antiferromagnetic materials
Year: 2016
Publisher: IEEE
Abstract: The magnetic and electronic contributions of the Pr ions only to the specific heat C<sub>p</sub>(T) and entropy S(T) defined by &#x0394;C<sub>p</sub>(T) and &#x0394;S(T), respectively, are revisited at low temperatures for nonsuperconducting PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> ceramics with x = 1 and 0.95. Two small anomalies are observed below the well-known anomaly due to the antiferromagnetic (AFM) ordering of the Pr sublattice at the Ne&#x0301;el temperature T<sub>N</sub> = 17.5 and 14 K, respectively. The first one, which occurs near the transition temperature T<sub>2</sub> ~ 10.5 and ~9.5 K, respectively, is due to the effect of the previous spin reorientation phase transition of the Pr moments. Whereas the second one, which appears for both states at the same critical temperature T<sub>cr</sub> ~ 4-5 K, is caused by the noncollinear magnetic reordering of the Pr subsystem. A phenomenological analysis is used in the fitting procedure below T<sub>cr</sub>. The values of the associated electronic linear coefficient &#x0394;&#x03B3; are found for both states fairly lower than those deduced from previous measurements on ceramics and single crystals in orthorhombic phase. In addition to the common T3 contribution to &#x0394;C<sub>p</sub>(T), which characterizes the Pr AFM ordering, the T5 contribution associated with the rather significant Pr-Cu(2) magnetic coupling introduces some nonlinear magnetic effects. All results are discussed and compared with earlier reports.
URI: http://localhost/handle/Hannan/160405
http://localhost/handle/Hannan/655991
ISSN: 1051-8223
1558-2515
volume: 26
issue: 3
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7444174.pdf892.16 kBAdobe PDFThumbnail
Preview File
Title: Revisiting of Specific Heat of Nonsuperconducting PrBCO Ceramics in Orthorhombic Phase: Signature of Magnetic Phase Transitions at Low Temperatures
Authors: Mahieddine Lahoubi
subject: Magnetic phase transition|Non-superconducting PrBCO|Calorimetry|Antiferromagnetic materials
Year: 2016
Publisher: IEEE
Abstract: The magnetic and electronic contributions of the Pr ions only to the specific heat C<sub>p</sub>(T) and entropy S(T) defined by &#x0394;C<sub>p</sub>(T) and &#x0394;S(T), respectively, are revisited at low temperatures for nonsuperconducting PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> ceramics with x = 1 and 0.95. Two small anomalies are observed below the well-known anomaly due to the antiferromagnetic (AFM) ordering of the Pr sublattice at the Ne&#x0301;el temperature T<sub>N</sub> = 17.5 and 14 K, respectively. The first one, which occurs near the transition temperature T<sub>2</sub> ~ 10.5 and ~9.5 K, respectively, is due to the effect of the previous spin reorientation phase transition of the Pr moments. Whereas the second one, which appears for both states at the same critical temperature T<sub>cr</sub> ~ 4-5 K, is caused by the noncollinear magnetic reordering of the Pr subsystem. A phenomenological analysis is used in the fitting procedure below T<sub>cr</sub>. The values of the associated electronic linear coefficient &#x0394;&#x03B3; are found for both states fairly lower than those deduced from previous measurements on ceramics and single crystals in orthorhombic phase. In addition to the common T3 contribution to &#x0394;C<sub>p</sub>(T), which characterizes the Pr AFM ordering, the T5 contribution associated with the rather significant Pr-Cu(2) magnetic coupling introduces some nonlinear magnetic effects. All results are discussed and compared with earlier reports.
URI: http://localhost/handle/Hannan/160405
http://localhost/handle/Hannan/655991
ISSN: 1051-8223
1558-2515
volume: 26
issue: 3
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7444174.pdf892.16 kBAdobe PDFThumbnail
Preview File