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Title: Possible experimental signature of charge-orbital density waves in Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4}: Heat capacity and magnetization study

Abstract

Single crystals of Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4} have been prepared by the traveling floating-zone method, and possible evidence of a charge-orbital density wave in this material was presented earlier [Phys. Rev. B 68, 092405 (2003)] using high-resolution electron microscopy and electron diffraction. We present possible further evidence of charge-orbital ordering in this material using heat capacity measurements. Our heat capacity measurements indicate a clear transition consistent with prior observation. We find two main transitions, one at temperature T{sub H}{sup HC}=310-314 K and other in the vicinity of T{sub A}{sup HC}=143 K. In addition, we may also conclude that there is a strong electron-phonon coupling in this material. In order to further study and confirm these anomalies we have performed dc magnetization measurements. The dc magnetic measurements confirm these two transitions. Again, we find two main transitions, one at temperature T{sub H}{sup M}=318-323 K and other at around T{sub A}{sup M}=164 K.

Authors:
; ; ;  [1]; ;  [2];  [3]
  1. AML, NIMS, Tsukuba 305-0044, Ibaraki (Japan)
  2. Crystal Group, Yamanashi University, Yamanashi (Japan)
  3. Department of Physics, Bahauddin Zakariya University, Multan (Pakistan)
Publication Date:
OSTI Identifier:
21045875
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 20; Other Information: DOI: 10.1103/PhysRevB.75.205134; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; CHARGE DENSITY; DENSITY; ELECTRON DIFFRACTION; ELECTRON-PHONON COUPLING; MAGNETIZATION; MANGANATES; MONOCRYSTALS; NEODYMIUM COMPOUNDS; SPECIFIC HEAT; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; ZONE MELTING

Citation Formats

Alam, Sher, Nagai, T., Xu, M., Matsui, Y., Islam, A. T. M. N., Tanaka, I., and Ahmad, Javed. Possible experimental signature of charge-orbital density waves in Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4}: Heat capacity and magnetization study. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.205134.
Alam, Sher, Nagai, T., Xu, M., Matsui, Y., Islam, A. T. M. N., Tanaka, I., & Ahmad, Javed. Possible experimental signature of charge-orbital density waves in Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4}: Heat capacity and magnetization study. United States. doi:10.1103/PHYSREVB.75.205134.
Alam, Sher, Nagai, T., Xu, M., Matsui, Y., Islam, A. T. M. N., Tanaka, I., and Ahmad, Javed. Tue . "Possible experimental signature of charge-orbital density waves in Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4}: Heat capacity and magnetization study". United States. doi:10.1103/PHYSREVB.75.205134.
@article{osti_21045875,
title = {Possible experimental signature of charge-orbital density waves in Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4}: Heat capacity and magnetization study},
author = {Alam, Sher and Nagai, T. and Xu, M. and Matsui, Y. and Islam, A. T. M. N. and Tanaka, I. and Ahmad, Javed},
abstractNote = {Single crystals of Nd{sub 1-x}Ca{sub 1+x}MnO{sub 4} have been prepared by the traveling floating-zone method, and possible evidence of a charge-orbital density wave in this material was presented earlier [Phys. Rev. B 68, 092405 (2003)] using high-resolution electron microscopy and electron diffraction. We present possible further evidence of charge-orbital ordering in this material using heat capacity measurements. Our heat capacity measurements indicate a clear transition consistent with prior observation. We find two main transitions, one at temperature T{sub H}{sup HC}=310-314 K and other in the vicinity of T{sub A}{sup HC}=143 K. In addition, we may also conclude that there is a strong electron-phonon coupling in this material. In order to further study and confirm these anomalies we have performed dc magnetization measurements. The dc magnetic measurements confirm these two transitions. Again, we find two main transitions, one at temperature T{sub H}{sup M}=318-323 K and other at around T{sub A}{sup M}=164 K.},
doi = {10.1103/PHYSREVB.75.205134},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 20,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}