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

Journal Article · Tue May 15 00:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.205134· OSTI ID:21045875

Alam, Sher; Nagai, T; Xu, M; Matsui, Y ^[1]; Tanaka, I ^[2]; Ahmad, Javed ^[3]

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1. AML, NIMS, Tsukuba 305-0044, Ibaraki (Japan)
2. Crystal Group, Yamanashi University, Yamanashi (Japan)
3. Department of Physics, Bahauddin Zakariya University, Multan (Pakistan)

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.

• OSTI ID: 21045875
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 20; Other Information: DOI: 10.1103/PhysRevB.75.205134; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

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