Magnetothermopower and magnetoresistivity of Ru Sr2Gd 2-xCexCu2O10+δ (x=0.6,1.0)

Chia-Jyi Liu, Pradipta K. Nayak, G. V M Williams

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We report measurements of magnetothermopower and magnetoresistivity as a function of temperature on Ru Sr2 Gd2-x Cex Cu2 O10+δ (x=0.6,1). In a magnetic field of 5 T, the size of thermopower decreases significantly, whereas the normal-state resistivity decreases slightly, which behaves similarly to Ru Sr2 Gd1-x Lax Cu2 O8 (x=0,0.1). A significant decrease of thermopower for both samples could be attributed to the decrease of the spin entropy contribution associated with the carriers in the Ru O2 layers, as the Ru moments are aligned with the magnetic field. It is also found that the nonmetallic temperature dependence at low T follows a variable range hopping process for both samples.

Original languageEnglish
Article number123110
JournalApplied Physics Letters
Volume91
Issue number12
DOIs
Publication statusPublished - 2007 Sep 28

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magnetoresistivity
magnetic fields
entropy
moments
temperature dependence
electrical resistivity
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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Magnetothermopower and magnetoresistivity of Ru Sr2Gd 2-xCexCu2O10+δ (x=0.6,1.0). / Liu, Chia-Jyi; Nayak, Pradipta K.; Williams, G. V M.

In: Applied Physics Letters, Vol. 91, No. 12, 123110, 28.09.2007.

Research output: Contribution to journalArticle

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T1 - Magnetothermopower and magnetoresistivity of Ru Sr2Gd 2-xCexCu2O10+δ (x=0.6,1.0)

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AU - Nayak, Pradipta K.

AU - Williams, G. V M

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N2 - We report measurements of magnetothermopower and magnetoresistivity as a function of temperature on Ru Sr2 Gd2-x Cex Cu2 O10+δ (x=0.6,1). In a magnetic field of 5 T, the size of thermopower decreases significantly, whereas the normal-state resistivity decreases slightly, which behaves similarly to Ru Sr2 Gd1-x Lax Cu2 O8 (x=0,0.1). A significant decrease of thermopower for both samples could be attributed to the decrease of the spin entropy contribution associated with the carriers in the Ru O2 layers, as the Ru moments are aligned with the magnetic field. It is also found that the nonmetallic temperature dependence at low T follows a variable range hopping process for both samples.

AB - We report measurements of magnetothermopower and magnetoresistivity as a function of temperature on Ru Sr2 Gd2-x Cex Cu2 O10+δ (x=0.6,1). In a magnetic field of 5 T, the size of thermopower decreases significantly, whereas the normal-state resistivity decreases slightly, which behaves similarly to Ru Sr2 Gd1-x Lax Cu2 O8 (x=0,0.1). A significant decrease of thermopower for both samples could be attributed to the decrease of the spin entropy contribution associated with the carriers in the Ru O2 layers, as the Ru moments are aligned with the magnetic field. It is also found that the nonmetallic temperature dependence at low T follows a variable range hopping process for both samples.

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