Results of fundamental and third order ac susceptibility measurements in a single crystal demonstrate that higher harmonics of ac-susceptibility measurement is an excellent tool to identify transitions/anomalies originating from different magnetic substructures that remain undetected by usual dc susceptibility measurements. Anomaly observed at low temperature has also been explored by differential scanning calorimetry, temperature dependent x-ray diffraction, and transmission electron microscopy measurements. The results demonstrate that the magnetic subsystem in Ni–Mn–Ga is unstable at low temperatures not only for metastable modulated crystal structure but also for very stable nonmodulated tetragonal structure.
REFERENCES
1.
V. V.
Khovaylo
, V. D.
Buchelnikov
, R.
Kainuma
, V. V.
Koledov
, M.
Ohtsuka
, V. G.
Shavrov
, T.
Takagi
, S. V.
Taskaev
, and A. N.
Vasiliev
, Phys. Rev. B
72
, 224408
(2005
).2.
J. I.
Pérez-Landazábal
, V.
Recarte
, C.
Gómez-Polo
, C.
Segui
, E.
Cesari
, and J.
Dutkiewicz
, Mater. Sci. Eng., A
481–482
, 318
(2008
).3.
V.
Soolshenko
, N.
Lanska
, and K.
Ullakko
, J. Phys. (France)
112
, 947
(2003
).4.
V. V.
Runov
, Yu. P.
Chernenkov
, M. K.
Runova
, V. G.
Gavriljuk
, and N. I.
Glavatska
, Physica B
335
, 109
(2003
).5.
S.
Nair
and A.
Bannerjee
, Phys. Rev. B
68
, 094408
(2003
).6.
A.
Bajpai
and A.
Banerjee
, Phys. Rev. B
62
, 8996
(2000
).7.
T.
Bitoh
, T.
Shirane
, and S.
Chikazawa
, J. Phys. Soc. Jpn.
62
, 2837
(1993
).8.
T.
Satō
and Y.
Miyako
, J. Phys. Soc. Jpn.
51
, 1394
(1982
).9.
X.
Zhou
, W.
Li
, H. P.
Kunkel
, and G.
Williams
, Phys. Rev. B
73
, 012412
(2006
).10.
P.
Morin
and D.
Schmitt
, Phys. Rev. B
23
, 5936
(1981
).11.
V. K.
Srivastava
, R.
Chatterjee
, A. K.
Nigam
, and R. C.
O’Handley
, Solid State Commun.
136
, 297
(2005
).12.
P.
Kamasa
, L. K.
Varga
, P.
Myœliñski
, S. G.
Rassolov
, V.
Maksimov
, and B.
Idzikowski
, Mater. Sci. (Poland)
26
, 947
(2008
).13.
V. K.
Srivastava
and R.
Chatterjee
, J. Phys. D: Appl. Phys.
40
, 4998
(2007
).14.
C.
Segui
, V. A.
Chernenko
, J.
Pons
, and E.
Cesari
, J. Magn. Magn. Mater.
290–291
, 811
(2005
).15.
L.
Dai
, J.
Cullen
, and M.
Wuttig
, J. Appl. Phys.
95
, 6957
(2004
).16.
A.
Sozinov
, A. A.
Likhachev
, N.
Lanska
, and K.
Ullakko
, Appl. Phys. Lett.
80
, 1746
(2002
).17.
N.
Glavatska
, G.
Mogilniy
, I.
Glavatsky
, S.
Danilkin
, D.
Hohlwein
, A.
Beskrovnij
, and V. K.
Lindroos
, J. Phys. (France)
112
, 963
(2003
).© 2010 American Institute of Physics.
2010
American Institute of Physics
You do not currently have access to this content.
