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Article overview
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Interplay between Charge and Magnetic Ordering in YbPd | | Atsushi Miyake
; Kazuki Kasano
; Tomoko Kagayama
; Katsuya Shimizu
; Ryo Takahashi
; Yusuke Wakabayashi
; Tsuyoshi Wakabayashi
; Takao Ebihara
; | | Date: |
11 Jun 2013 | | Abstract: | The pressure-temperature phase diagram of an intermediate-valence compound
YbPd was revealed via simultaneous ac-calorimetry and electrical resistivity
measurements. Two successive structural phase transition temperatures, $T_1$ =
125 K and $T_2$ = 110 K, are found to decrease with increasing pressure. The
magnetic ordering transition at $T_{
m N} ~sim$ 1.9 K decreases monotonically
up to 1.7 GPa and disappears discontinuously at $P_{
m c} sim$ 1.9 GPa, where
the structural phase transition at $T_2$ is also suppressed. At $P_{
m c}$,
enhancement of the effective mass and residual resistivity are observed.
Another probable magnetic phase transition, however, is found to take place at
$T_{
m ML} sim$0.3 K and smoothly varies even when crossing $P_{
m c}$.
Structural phase transitions at ambient pressure were also studied by a single
crystal X-ray diffraction measurement. Below $T_2$, a tetragonal lattice
distortion with doubling of the unit cell along the c-axis is observed, and
thus there are two inequivalent Yb-sites below $P_{
m c}$. These results
indicate that one Yb-site, having larger valence configuration and thus smaller
Kondo temperature, orders at $T_{
m N}$. The other phase transition at $T_{
m
ML}$ seems to couple to the crystal structure for $T_2 < T < T_1$. YbPd is a
unique system exhibiting magnetic orderings in metallic charge-ordered Yb
systems. | | Source: | arXiv, 1306.2447 | | Services: | Forum | Review | PDF | Favorites | |
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